Fix the detection of the LLVM bitcode compiler. This is now done at KLEE

configure time, not LLVM configure time! Configure will fail without
a working LLVM bitcode compiler. The precedence of detection is as
follows:

1. Compilers set by newly added --with-llvmcc= --with-llvmcxx= configure flags.
2. Clang in LLVM build directory.
3. llvm-gcc in PATH.
4. clang in PATH.

This has been tested with llvm2.9 (llvm-gcc in PATH) and llvm3.3 (clang
built in LLVM build directory).

This addresses a major pain point for new users of KLEE who forget to
put llvm-gcc in their PATH at LLVM configure time and then are later
forced to reconfigure and rebuild LLVM just so KLEE knows the right
PATH!

4 files changed, 682 insertions, 195 deletions

diff --git a/Makefile.config.in b/Makefile.config.in
index cd209127..452cc1a1 100644
--- a/Makefile.config.in
+++ b/Makefile.config.in
@@ -44,6 +44,10 @@ RUNTIME_DEBUG_SYMBOLS := @RUNTIME_DEBUG_SYMBOLS@
 RUNTIME_ENABLE_COVERAGE :=
 RUNTIME_ENABLE_PROFILING :=
 
+# Compilers used to build runtime library and run tests
+KLEE_BITCODE_C_COMPILER := @KLEE_BITCODE_C_COMPILER@
+KLEE_BITCODE_CXX_COMPILER := @KLEE_BITCODE_CXX_COMPILER@
+
 # A list of "features" which tests can check for in XFAIL:
 TEST_FEATURE_LIST :=
 
diff --git a/Makefile.rules b/Makefile.rules
index be1dab5d..5e954adf 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -433,24 +433,9 @@ endif
 # LLVM Capable Compiler
 #--------------------------------------------------------------------
 
-ifeq ($(LLVMCC_OPTION),llvm-gcc)
-  LLVMCC := $(LLVMGCC)
-  LLVMCXX := $(LLVMGXX)
-else
-  ifeq ($(LLVMCC_OPTION),clang)
-    ifneq ($(CLANGPATH),)
-      LLVMCC := $(CLANGPATH)
-      LLVMCXX := $(CLANGXXPATH)
-    else
-      ifeq ($(ENABLE_BUILT_CLANG),1)
-        LLVMCC := $(LLVMToolDir)/clang
-        LLVMCXX := $(LLVMToolDir)/clang++
-      endif
-    endif
-  else
-    LLVMCC := $(LLVMGCC)
-    LLVMCXX := $(LLVMGXX)
-  endif
+# Use detected compiler at KLEE configure time, not llvm configure time
+LLVMCC := $(KLEE_BITCODE_C_COMPILER)
+LLVMCXX := $(KLEE_BITCODE_CXX_COMPILER)
 
   ifeq ($(wildcard $(LLVMCC)),)
     $(warning Provided Compiler "$(LLVMCC)" is not found. Provide full path!)
@@ -458,7 +443,6 @@ else
   ifeq ($(wildcard $(LLVMCXX)),)
     $(warning Provided Compiler "$(LLVMCXX)" is not found. Provide full path!)
   endif
-endif
 
 #--------------------------------------------------------------------
 # Full Paths To Compiled Tools and Utilities
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index b41b6848..2fd162f2 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -181,6 +181,163 @@ AC_MSG_RESULT([$llvm_build_mode])
 AC_SUBST(LLVM_BUILD_MODE,$llvm_build_mode)
 
 dnl **************************************************************************
+dnl Detect a LLVM Bitcode compiler for building KLEE runtime library
+
+dnl Check for clang built with llvm build
+AC_MSG_CHECKING([LLVM Bitcode compiler])
+klee_llvm_bc_c_compiler=""
+klee_llvm_bc_cxx_compiler=""
+
+AC_ARG_WITH([llvmcc],
+            AS_HELP_STRING([--with-llvmcc],
+                           [Set the path to the C LLVM bitcode compiler to use (Default: auto-detect). If set, --with-llvmcxx= must be set too.]
+                          ),
+            [],
+            [with_llvmcc=none]
+           )
+
+AC_ARG_WITH([llvmcxx],
+            AS_HELP_STRING([--with-llvmcxx],
+                           [Set the path to the C++ LLVM bitcode compiler to use (Default: auto-detect). If set, --with-llvmcc= must be set too.]
+                          ),
+            [],
+            [with_llvmcxx=none]
+           )
+if test \( "X$with_llvmcc" != Xnone -a "X$with_llvmcxx" = Xnone \) -o \( "X$with_llvmcxx" != Xnone -a "X$with_llvmcc" = Xnone \) ; then
+    AC_MSG_ERROR([You must set both --with-llvmcc= and --with-llvmcxx= or set neither])
+fi
+
+if test X$with_llvmcc = Xnone ; then
+    dnl Try to automatically find compiler
+    
+    dnl Try Clang inside the LLVM build
+    if test -x "$llvm_obj/$llvm_build_mode/bin/clang" ; then
+        AC_MSG_RESULT([Found clang in LLVM Build])
+        klee_llvm_bc_c_compiler="$llvm_obj/$llvm_build_mode/bin/clang"
+
+        if test -x "$llvm_obj/$llvm_build_mode/bin/clang++" ; then
+            klee_llvm_bc_cxx_compiler="$llvm_obj/$llvm_build_mode/bin/clang++"
+        else
+            AC_MSG_ERROR([Found clang but could not find clang++])
+        fi
+    fi
+
+    dnl Try llvm-gcc in PATH
+    if test "X${klee_llvm_bc_c_compiler}" = X ; then
+        AC_MSG_RESULT([]) # Force a new line
+        AC_CHECK_PROG(llvm_gcc,llvm-gcc,FOUND,NOT_FOUND)
+        if test ${llvm_gcc} = FOUND ; then
+            klee_llvm_bc_c_compiler=`which llvm-gcc`
+
+            AC_CHECK_PROG(llvm_gxx,llvm-g++,FOUND,NOT_FOUND)
+            if test ${llvm_gxx} = FOUND; then
+                klee_llvm_bc_cxx_compiler=`which llvm-g++`
+            else
+                AC_MSG_ERROR([Found llvm-gcc but could not find llvm-g++ in PATH])
+            fi
+        fi
+
+    fi
+
+    dnl Try clang in PATH
+    if test "X${klee_llvm_bc_c_compiler}" = X ; then
+        AC_MSG_RESULT([]) # Force a new line
+        AC_CHECK_PROG(clang,clang,FOUND,NOT_FOUND)
+        if test ${clang} = FOUND ; then
+            klee_llvm_bc_c_compiler=`which clang`
+
+            AC_CHECK_PROG(clang_cxx,clang++,FOUND,NOT_FOUND)
+            if test ${clang_cxx} = FOUND; then
+                klee_llvm_bc_cxx_compiler=`which clang++`
+            else
+                AC_MSG_ERROR([Found clang but could not find clang++ in PATH])
+            fi
+        fi
+
+    fi
+
+    if test X"${klee_llvm_bc_c_compiler}" = X ; then
+        AC_MSG_ERROR([Could not find a C LLVM Bitcode compiler. Did you try building Clang in the LLVM Build directory or putting llvm-gcc or clang in your path?])
+    fi
+
+    if test X"${klee_llvm_bc_cxx_compiler}" = X ; then
+        AC_MSG_ERROR([Could not find a C++ LLVM Bitcode compiler. Did you try building Clang in the LLVM Build directory or putting llvm-gcc or clang in your path?])
+    fi
+
+else
+    dnl Use user supplied values
+    klee_llvm_bc_c_compiler="$with_llvmcc"
+    klee_llvm_bc_cxx_compiler="$with_llvmcxx"
+
+    if test \! -x "${klee_llvm_bc_c_compiler}"; then
+        AC_MSG_ERROR([--with-llvmcc= supplied compiler does not exist])
+    fi
+
+    if test \! -x "${klee_llvm_bc_cxx_compiler}"; then
+        AC_MSG_ERROR([--with-llvmcxx= supplied compiler does not exist])
+    fi
+    AC_MSG_RESULT([Using user supplied LLVM bitcode compilers.])
+fi
+
+dnl Tell the user what we are going to try and use
+AC_MSG_RESULT([Using C llvm compiler : $klee_llvm_bc_c_compiler])
+AC_MSG_RESULT([Using C++ llvm compiler : $klee_llvm_bc_cxx_compiler])
+
+dnl Test that the bitcode compiler works
+
+dnl Function for checking bitcode compiler works
+dnl $1 : compiler to invoke
+dnl $2 : source code extension (e.g. cpp or c)
+dnl $3 : Compiler string (e.g. CXX or C)
+function klee_check_bc()
+{
+    AC_MSG_CHECKING([${3} LLVM Bitcode compiler works])
+    dnl FIXME: write to tmp directory instead of binary build dir
+    klee_bc_test_file="./.klee_llvm_bitcode_test.${2}"
+
+    echo "int main() { return 0;}" > "${klee_bc_test_file}"
+    "${1}" -emit-llvm -c "${klee_bc_test_file}" -o "${klee_bc_test_file}.bc"
+    if test $? -ne 0 ; then
+        AC_MSG_ERROR([Failed running ${3} LLVM Bitcode compiler])
+    fi
+
+    if test \! -e "${klee_bc_test_file}.bc"; then
+        AC_MSG_ERROR([ ${3} LLVM Bitcode compiler did not produce any output])
+    fi
+
+    dnl Convert bitcode to human readable form as a hacky check
+    dnl that the version of LLVM we are configuring with can
+    dnl parse the LLVM bitcode produced by the detected compiler
+    if test -x "$llvm_obj/$llvm_build_mode/bin/llvm-dis" ; then
+        "$llvm_obj/$llvm_build_mode/bin/llvm-dis" -o "${klee_bc_test_file}.ll" "${klee_bc_test_file}.bc"
+
+        if test $? -ne 0; then
+            AC_MSG_ERROR([Failed converting LLVM Bitcode to LLVM assembly. Maybe your LLVM versions do not match?])
+        fi
+
+        if test -e "${klee_bc_test_file}.ll" ; then
+            AC_MSG_RESULT([Success])
+            rm "${klee_bc_test_file}" "${klee_bc_test_file}.bc" "${klee_bc_test_file}.ll"
+        else
+            rm "${klee_bc_test_file}" "${klee_bc_test_file}.bc" "${klee_bc_test_file}.ll"
+            AC_MSG_ERROR([Failed converting LLVM Bitcode to LLVM assembly. Maybe your LLVM versions do not match?])
+        fi
+        
+    else
+        rm "${klee_bc_test_file}" "${klee_bc_test_file}.bc"
+        AC_MSG_ERROR([Could not find llvm-dis])
+    fi
+}
+
+dnl Invoke previously defined function to check the LLVM bitcode compilers
+klee_check_bc "${klee_llvm_bc_c_compiler}" "c" "C"
+klee_check_bc "${klee_llvm_bc_cxx_compiler}" "cpp" "CXX"
+
+dnl Set variable for Makefile.config
+AC_SUBST(KLEE_BITCODE_C_COMPILER,$klee_llvm_bc_c_compiler)
+AC_SUBST(KLEE_BITCODE_CXX_COMPILER,$klee_llvm_bc_cxx_compiler)
+
+dnl **************************************************************************
 dnl User option to enable uClibc support.
 
 AC_ARG_WITH(uclibc,
diff --git a/configure b/configure
index c4c880d9..5d138b61 100755
--- a/configure
+++ b/configure
@@ -1,13 +1,11 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.67 for KLEE 0.01.
+# Generated by GNU Autoconf 2.69 for KLEE 0.01.
 #
 # Report bugs to <daniel@minormatter.com>.
 #
 #
-# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
-# 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software
-# Foundation, Inc.
+# Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
 #
 #
 # This configure script is free software; the Free Software Foundation
@@ -91,6 +89,7 @@ fi
 IFS=" ""	$as_nl"
 
 # Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
 case $0 in #((
   *[\\/]* ) as_myself=$0 ;;
   *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
@@ -135,6 +134,31 @@ export LANGUAGE
 # CDPATH.
 (unset CDPATH) >/dev/null 2>&1 && unset CDPATH
 
+# Use a proper internal environment variable to ensure we don't fall
+  # into an infinite loop, continuously re-executing ourselves.
+  if test x"${_as_can_reexec}" != xno && test "x$CONFIG_SHELL" != x; then
+    _as_can_reexec=no; export _as_can_reexec;
+    # We cannot yet assume a decent shell, so we have to provide a
+# neutralization value for shells without unset; and this also
+# works around shells that cannot unset nonexistent variables.
+# Preserve -v and -x to the replacement shell.
+BASH_ENV=/dev/null
+ENV=/dev/null
+(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
+case $- in # ((((
+  *v*x* | *x*v* ) as_opts=-vx ;;
+  *v* ) as_opts=-v ;;
+  *x* ) as_opts=-x ;;
+  * ) as_opts= ;;
+esac
+exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
+# Admittedly, this is quite paranoid, since all the known shells bail
+# out after a failed `exec'.
+$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
+as_fn_exit 255
+  fi
+  # We don't want this to propagate to other subprocesses.
+          { _as_can_reexec=; unset _as_can_reexec;}
 if test "x$CONFIG_SHELL" = x; then
   as_bourne_compatible="if test -n \"\${ZSH_VERSION+set}\" && (emulate sh) >/dev/null 2>&1; then :
   emulate sh
@@ -168,7 +192,8 @@ if ( set x; as_fn_ret_success y && test x = \"\$1\" ); then :
 else
   exitcode=1; echo positional parameters were not saved.
 fi
-test x\$exitcode = x0 || exit 1"
+test x\$exitcode = x0 || exit 1
+test -x / || exit 1"
   as_suggested="  as_lineno_1=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_1a=\$LINENO
   as_lineno_2=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_2a=\$LINENO
   eval 'test \"x\$as_lineno_1'\$as_run'\" != \"x\$as_lineno_2'\$as_run'\" &&
@@ -213,14 +238,25 @@ IFS=$as_save_IFS
 
 
       if test "x$CONFIG_SHELL" != x; then :
-  # We cannot yet assume a decent shell, so we have to provide a
-	# neutralization value for shells without unset; and this also
-	# works around shells that cannot unset nonexistent variables.
-	BASH_ENV=/dev/null
-	ENV=/dev/null
-	(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
-	export CONFIG_SHELL
-	exec "$CONFIG_SHELL" "$as_myself" ${1+"$@"}
+  export CONFIG_SHELL
+             # We cannot yet assume a decent shell, so we have to provide a
+# neutralization value for shells without unset; and this also
+# works around shells that cannot unset nonexistent variables.
+# Preserve -v and -x to the replacement shell.
+BASH_ENV=/dev/null
+ENV=/dev/null
+(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
+case $- in # ((((
+  *v*x* | *x*v* ) as_opts=-vx ;;
+  *v* ) as_opts=-v ;;
+  *x* ) as_opts=-x ;;
+  * ) as_opts= ;;
+esac
+exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
+# Admittedly, this is quite paranoid, since all the known shells bail
+# out after a failed `exec'.
+$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
+exit 255
 fi
 
     if test x$as_have_required = xno; then :
@@ -323,6 +359,14 @@ $as_echo X"$as_dir" |
 
 
 } # as_fn_mkdir_p
+
+# as_fn_executable_p FILE
+# -----------------------
+# Test if FILE is an executable regular file.
+as_fn_executable_p ()
+{
+  test -f "$1" && test -x "$1"
+} # as_fn_executable_p
 # as_fn_append VAR VALUE
 # ----------------------
 # Append the text in VALUE to the end of the definition contained in VAR. Take
@@ -444,6 +488,10 @@ as_cr_alnum=$as_cr_Letters$as_cr_digits
   chmod +x "$as_me.lineno" ||
     { $as_echo "$as_me: error: cannot create $as_me.lineno; rerun with a POSIX shell" >&2; as_fn_exit 1; }
 
+  # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
+  # already done that, so ensure we don't try to do so again and fall
+  # in an infinite loop.  This has already happened in practice.
+  _as_can_reexec=no; export _as_can_reexec
   # Don't try to exec as it changes $[0], causing all sort of problems
   # (the dirname of $[0] is not the place where we might find the
   # original and so on.  Autoconf is especially sensitive to this).
@@ -478,16 +526,16 @@ if (echo >conf$$.file) 2>/dev/null; then
     # ... but there are two gotchas:
     # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
     # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
-    # In both cases, we have to default to `cp -p'.
+    # In both cases, we have to default to `cp -pR'.
     ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
-      as_ln_s='cp -p'
+      as_ln_s='cp -pR'
   elif ln conf$$.file conf$$ 2>/dev/null; then
     as_ln_s=ln
   else
-    as_ln_s='cp -p'
+    as_ln_s='cp -pR'
   fi
 else
-  as_ln_s='cp -p'
+  as_ln_s='cp -pR'
 fi
 rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
 rmdir conf$$.dir 2>/dev/null
@@ -499,28 +547,8 @@ else
   as_mkdir_p=false
 fi
 
-if test -x / >/dev/null 2>&1; then
-  as_test_x='test -x'
-else
-  if ls -dL / >/dev/null 2>&1; then
-    as_ls_L_option=L
-  else
-    as_ls_L_option=
-  fi
-  as_test_x='
-    eval sh -c '\''
-      if test -d "$1"; then
-	test -d "$1/.";
-      else
-	case $1 in #(
-	-*)set "./$1";;
-	esac;
-	case `ls -ld'$as_ls_L_option' "$1" 2>/dev/null` in #((
-	???[sx]*):;;*)false;;esac;fi
-    '\'' sh
-  '
-fi
-as_executable_p=$as_test_x
+as_test_x='test -x'
+as_executable_p=as_fn_executable_p
 
 # Sed expression to map a string onto a valid CPP name.
 as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
@@ -622,6 +650,12 @@ RUNTIME_ENABLE_OPTIMIZED
 ENABLE_POSIX_RUNTIME
 ENABLE_UCLIBC
 KLEE_UCLIBC
+KLEE_BITCODE_CXX_COMPILER
+KLEE_BITCODE_C_COMPILER
+clang_cxx
+clang
+llvm_gxx
+llvm_gcc
 LLVM_BUILD_MODE
 REQUIRES_RTTI
 LLVM_IS_RELEASE
@@ -686,6 +720,8 @@ with_llvmsrc
 with_llvmobj
 with_llvm
 with_llvm_build_mode
+with_llvmcc
+with_llvmcxx
 with_uclibc
 enable_posix_runtime
 with_runtime
@@ -1109,7 +1145,7 @@ Try \`$0 --help' for more information"
     $as_echo "$as_me: WARNING: you should use --build, --host, --target" >&2
     expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
       $as_echo "$as_me: WARNING: invalid host type: $ac_option" >&2
-    : ${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}
+    : "${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}"
     ;;
 
   esac
@@ -1160,8 +1196,6 @@ target=$target_alias
 if test "x$host_alias" != x; then
   if test "x$build_alias" = x; then
     cross_compiling=maybe
-    $as_echo "$as_me: WARNING: if you wanted to set the --build type, don't use --host.
-    If a cross compiler is detected then cross compile mode will be used" >&2
   elif test "x$build_alias" != "x$host_alias"; then
     cross_compiling=yes
   fi
@@ -1331,6 +1365,12 @@ Optional Packages:
   --with-llvm             Location of LLVM Source and Object code
   --with-llvm-build-mode  LLVM build mode (e.g. Debug or Release, default
                           autodetect)
+  --with-llvmcc           Set the path to the C LLVM bitcode compiler to use
+                          (Default: auto-detect). If set, --with-llvmcxx= must
+                          be set too.
+  --with-llvmcxx          Set the path to the C++ LLVM bitcode compiler to use
+                          (Default: auto-detect). If set, --with-llvmcc= must
+                          be set too.
   --with-uclibc           Enable use of the klee uclibc at the given path
   --with-runtime          Select build configuration for runtime libraries
                           (default [Release+Asserts])
@@ -1417,9 +1457,9 @@ test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
 KLEE configure 0.01
-generated by GNU Autoconf 2.67
+generated by GNU Autoconf 2.69
 
-Copyright (C) 2010 Free Software Foundation, Inc.
+Copyright (C) 2012 Free Software Foundation, Inc.
 This configure script is free software; the Free Software Foundation
 gives unlimited permission to copy, distribute and modify it.
 _ACEOF
@@ -1463,7 +1503,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
 	ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_compile
@@ -1500,7 +1540,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
     ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_cpp
@@ -1513,10 +1553,10 @@ fi
 ac_fn_c_check_header_mongrel ()
 {
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  if eval "test \"\${$3+set}\"" = set; then :
+  if eval \${$3+:} false; then :
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 fi
 eval ac_res=\$$3
@@ -1583,7 +1623,7 @@ $as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
 esac
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   eval "$3=\$ac_header_compiler"
@@ -1592,7 +1632,7 @@ eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_header_mongrel
 
@@ -1633,7 +1673,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
        ac_retval=$ac_status
 fi
   rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_run
@@ -1647,7 +1687,7 @@ ac_fn_c_check_header_compile ()
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -1665,7 +1705,7 @@ fi
 eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_header_compile
 
@@ -1702,7 +1742,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
 	ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_cxx_try_compile
@@ -1739,7 +1779,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
     ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_cxx_try_cpp
@@ -1752,10 +1792,10 @@ fi
 ac_fn_cxx_check_header_mongrel ()
 {
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  if eval "test \"\${$3+set}\"" = set; then :
+  if eval \${$3+:} false; then :
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 fi
 eval ac_res=\$$3
@@ -1822,7 +1862,7 @@ $as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
 esac
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   eval "$3=\$ac_header_compiler"
@@ -1831,7 +1871,7 @@ eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_cxx_check_header_mongrel
 
@@ -1862,7 +1902,7 @@ $as_echo "$ac_try_echo"; } >&5
 	 test ! -s conftest.err
        } && test -s conftest$ac_exeext && {
 	 test "$cross_compiling" = yes ||
-	 $as_test_x conftest$ac_exeext
+	 test -x conftest$ac_exeext
        }; then :
   ac_retval=0
 else
@@ -1876,7 +1916,7 @@ fi
   # interfere with the next link command; also delete a directory that is
   # left behind by Apple's compiler.  We do this before executing the actions.
   rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_cxx_try_link
@@ -1885,7 +1925,7 @@ This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
 It was created by KLEE $as_me 0.01, which was
-generated by GNU Autoconf 2.67.  Invocation command line was
+generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
 
@@ -2143,7 +2183,7 @@ $as_echo "$as_me: loading site script $ac_site_file" >&6;}
       || { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "failed to load site script $ac_site_file
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
   fi
 done
 
@@ -2318,7 +2358,7 @@ $SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking build system type" >&5
 $as_echo_n "checking build system type... " >&6; }
-if test "${ac_cv_build+set}" = set; then :
+if ${ac_cv_build+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_build_alias=$build_alias
@@ -2334,7 +2374,7 @@ fi
 $as_echo "$ac_cv_build" >&6; }
 case $ac_cv_build in
 *-*-*) ;;
-*) as_fn_error $? "invalid value of canonical build" "$LINENO" 5 ;;
+*) as_fn_error $? "invalid value of canonical build" "$LINENO" 5;;
 esac
 build=$ac_cv_build
 ac_save_IFS=$IFS; IFS='-'
@@ -2352,7 +2392,7 @@ case $build_os in *\ *) build_os=`echo "$build_os" | sed 's/ /-/g'`;; esac
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking host system type" >&5
 $as_echo_n "checking host system type... " >&6; }
-if test "${ac_cv_host+set}" = set; then :
+if ${ac_cv_host+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test "x$host_alias" = x; then
@@ -2367,7 +2407,7 @@ fi
 $as_echo "$ac_cv_host" >&6; }
 case $ac_cv_host in
 *-*-*) ;;
-*) as_fn_error $? "invalid value of canonical host" "$LINENO" 5 ;;
+*) as_fn_error $? "invalid value of canonical host" "$LINENO" 5;;
 esac
 host=$ac_cv_host
 ac_save_IFS=$IFS; IFS='-'
@@ -2385,7 +2425,7 @@ case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking target system type" >&5
 $as_echo_n "checking target system type... " >&6; }
-if test "${ac_cv_target+set}" = set; then :
+if ${ac_cv_target+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test "x$target_alias" = x; then
@@ -2400,7 +2440,7 @@ fi
 $as_echo "$ac_cv_target" >&6; }
 case $ac_cv_target in
 *-*-*) ;;
-*) as_fn_error $? "invalid value of canonical target" "$LINENO" 5 ;;
+*) as_fn_error $? "invalid value of canonical target" "$LINENO" 5;;
 esac
 target=$ac_cv_target
 ac_save_IFS=$IFS; IFS='-'
@@ -2425,7 +2465,7 @@ test -n "$target_alias" &&
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking type of operating system we're going to host on" >&5
 $as_echo_n "checking type of operating system we're going to host on... " >&6; }
-if test "${klee_cv_os_type+set}" = set; then :
+if ${klee_cv_os_type+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   case $host in
@@ -2595,6 +2635,306 @@ LLVM_BUILD_MODE=$llvm_build_mode
 
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking LLVM Bitcode compiler" >&5
+$as_echo_n "checking LLVM Bitcode compiler... " >&6; }
+klee_llvm_bc_c_compiler=""
+klee_llvm_bc_cxx_compiler=""
+
+
+# Check whether --with-llvmcc was given.
+if test "${with_llvmcc+set}" = set; then :
+  withval=$with_llvmcc;
+else
+  with_llvmcc=none
+
+fi
+
+
+
+# Check whether --with-llvmcxx was given.
+if test "${with_llvmcxx+set}" = set; then :
+  withval=$with_llvmcxx;
+else
+  with_llvmcxx=none
+
+fi
+
+if test \( "X$with_llvmcc" != Xnone -a "X$with_llvmcxx" = Xnone \) -o \( "X$with_llvmcxx" != Xnone -a "X$with_llvmcc" = Xnone \) ; then
+    as_fn_error $? "You must set both --with-llvmcc= and --with-llvmcxx= or set neither" "$LINENO" 5
+fi
+
+if test X$with_llvmcc = Xnone ; then
+
+        if test -x "$llvm_obj/$llvm_build_mode/bin/clang" ; then
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: Found clang in LLVM Build" >&5
+$as_echo "Found clang in LLVM Build" >&6; }
+        klee_llvm_bc_c_compiler="$llvm_obj/$llvm_build_mode/bin/clang"
+
+        if test -x "$llvm_obj/$llvm_build_mode/bin/clang++" ; then
+            klee_llvm_bc_cxx_compiler="$llvm_obj/$llvm_build_mode/bin/clang++"
+        else
+            as_fn_error $? "Found clang but could not find clang++" "$LINENO" 5
+        fi
+    fi
+
+        if test "X${klee_llvm_bc_c_compiler}" = X ; then
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: " >&5
+$as_echo "" >&6; } # Force a new line
+        # Extract the first word of "llvm-gcc", so it can be a program name with args.
+set dummy llvm-gcc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_llvm_gcc+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$llvm_gcc"; then
+  ac_cv_prog_llvm_gcc="$llvm_gcc" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_llvm_gcc="FOUND"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  test -z "$ac_cv_prog_llvm_gcc" && ac_cv_prog_llvm_gcc="NOT_FOUND"
+fi
+fi
+llvm_gcc=$ac_cv_prog_llvm_gcc
+if test -n "$llvm_gcc"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $llvm_gcc" >&5
+$as_echo "$llvm_gcc" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+        if test ${llvm_gcc} = FOUND ; then
+            klee_llvm_bc_c_compiler=`which llvm-gcc`
+
+            # Extract the first word of "llvm-g++", so it can be a program name with args.
+set dummy llvm-g++; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_llvm_gxx+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$llvm_gxx"; then
+  ac_cv_prog_llvm_gxx="$llvm_gxx" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_llvm_gxx="FOUND"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  test -z "$ac_cv_prog_llvm_gxx" && ac_cv_prog_llvm_gxx="NOT_FOUND"
+fi
+fi
+llvm_gxx=$ac_cv_prog_llvm_gxx
+if test -n "$llvm_gxx"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $llvm_gxx" >&5
+$as_echo "$llvm_gxx" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+            if test ${llvm_gxx} = FOUND; then
+                klee_llvm_bc_cxx_compiler=`which llvm-g++`
+            else
+                as_fn_error $? "Found llvm-gcc but could not find llvm-g++ in PATH" "$LINENO" 5
+            fi
+        fi
+
+    fi
+
+        if test "X${klee_llvm_bc_c_compiler}" = X ; then
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: " >&5
+$as_echo "" >&6; } # Force a new line
+        # Extract the first word of "clang", so it can be a program name with args.
+set dummy clang; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_clang+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$clang"; then
+  ac_cv_prog_clang="$clang" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_clang="FOUND"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  test -z "$ac_cv_prog_clang" && ac_cv_prog_clang="NOT_FOUND"
+fi
+fi
+clang=$ac_cv_prog_clang
+if test -n "$clang"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $clang" >&5
+$as_echo "$clang" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+        if test ${clang} = FOUND ; then
+            klee_llvm_bc_c_compiler=`which clang`
+
+            # Extract the first word of "clang++", so it can be a program name with args.
+set dummy clang++; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_clang_cxx+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$clang_cxx"; then
+  ac_cv_prog_clang_cxx="$clang_cxx" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_clang_cxx="FOUND"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  test -z "$ac_cv_prog_clang_cxx" && ac_cv_prog_clang_cxx="NOT_FOUND"
+fi
+fi
+clang_cxx=$ac_cv_prog_clang_cxx
+if test -n "$clang_cxx"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $clang_cxx" >&5
+$as_echo "$clang_cxx" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+            if test ${clang_cxx} = FOUND; then
+                klee_llvm_bc_cxx_compiler=`which clang++`
+            else
+                as_fn_error $? "Found clang but could not find clang++ in PATH" "$LINENO" 5
+            fi
+        fi
+
+    fi
+
+    if test X"${klee_llvm_bc_c_compiler}" = X ; then
+        as_fn_error $? "Could not find a C LLVM Bitcode compiler. Did you try building Clang in the LLVM Build directory or putting llvm-gcc or clang in your path?" "$LINENO" 5
+    fi
+
+    if test X"${klee_llvm_bc_cxx_compiler}" = X ; then
+        as_fn_error $? "Could not find a C++ LLVM Bitcode compiler. Did you try building Clang in the LLVM Build directory or putting llvm-gcc or clang in your path?" "$LINENO" 5
+    fi
+
+else
+        klee_llvm_bc_c_compiler="$with_llvmcc"
+    klee_llvm_bc_cxx_compiler="$with_llvmcxx"
+
+    if test \! -x "${klee_llvm_bc_c_compiler}"; then
+        as_fn_error $? "--with-llvmcc= supplied compiler does not exist" "$LINENO" 5
+    fi
+
+    if test \! -x "${klee_llvm_bc_cxx_compiler}"; then
+        as_fn_error $? "--with-llvmcxx= supplied compiler does not exist" "$LINENO" 5
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: Using user supplied LLVM bitcode compilers." >&5
+$as_echo "Using user supplied LLVM bitcode compilers." >&6; }
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Using C llvm compiler : $klee_llvm_bc_c_compiler" >&5
+$as_echo "Using C llvm compiler : $klee_llvm_bc_c_compiler" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Using C++ llvm compiler : $klee_llvm_bc_cxx_compiler" >&5
+$as_echo "Using C++ llvm compiler : $klee_llvm_bc_cxx_compiler" >&6; }
+
+
+function klee_check_bc()
+{
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking ${3} LLVM Bitcode compiler works" >&5
+$as_echo_n "checking ${3} LLVM Bitcode compiler works... " >&6; }
+        klee_bc_test_file="./.klee_llvm_bitcode_test.${2}"
+
+    echo "int main() { return 0;}" > "${klee_bc_test_file}"
+    "${1}" -emit-llvm -c "${klee_bc_test_file}" -o "${klee_bc_test_file}.bc"
+    if test $? -ne 0 ; then
+        as_fn_error $? "Failed running ${3} LLVM Bitcode compiler" "$LINENO" 5
+    fi
+
+    if test \! -e "${klee_bc_test_file}.bc"; then
+        as_fn_error $? " ${3} LLVM Bitcode compiler did not produce any output" "$LINENO" 5
+    fi
+
+                if test -x "$llvm_obj/$llvm_build_mode/bin/llvm-dis" ; then
+        "$llvm_obj/$llvm_build_mode/bin/llvm-dis" -o "${klee_bc_test_file}.ll" "${klee_bc_test_file}.bc"
+
+        if test $? -ne 0; then
+            as_fn_error $? "Failed converting LLVM Bitcode to LLVM assembly. Maybe your LLVM versions do not match?" "$LINENO" 5
+        fi
+
+        if test -e "${klee_bc_test_file}.ll" ; then
+            { $as_echo "$as_me:${as_lineno-$LINENO}: result: Success" >&5
+$as_echo "Success" >&6; }
+            rm "${klee_bc_test_file}" "${klee_bc_test_file}.bc" "${klee_bc_test_file}.ll"
+        else
+            rm "${klee_bc_test_file}" "${klee_bc_test_file}.bc" "${klee_bc_test_file}.ll"
+            as_fn_error $? "Failed converting LLVM Bitcode to LLVM assembly. Maybe your LLVM versions do not match?" "$LINENO" 5
+        fi
+
+    else
+        rm "${klee_bc_test_file}" "${klee_bc_test_file}.bc"
+        as_fn_error $? "Could not find llvm-dis" "$LINENO" 5
+    fi
+}
+
+klee_check_bc "${klee_llvm_bc_c_compiler}" "c" "C"
+klee_check_bc "${klee_llvm_bc_cxx_compiler}" "cpp" "CXX"
+
+KLEE_BITCODE_C_COMPILER=$klee_llvm_bc_c_compiler
+
+KLEE_BITCODE_CXX_COMPILER=$klee_llvm_bc_cxx_compiler
+
+
+
 
 # Check whether --with-uclibc was given.
 if test "${with_uclibc+set}" = set; then :
@@ -2772,7 +3112,7 @@ if test -n "$ac_tool_prefix"; then
 set dummy ${ac_tool_prefix}gcc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2784,7 +3124,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_CC="${ac_tool_prefix}gcc"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -2812,7 +3152,7 @@ if test -z "$ac_cv_prog_CC"; then
 set dummy gcc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_CC+set}" = set; then :
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_CC"; then
@@ -2824,7 +3164,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_ac_ct_CC="gcc"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -2865,7 +3205,7 @@ if test -z "$CC"; then
 set dummy ${ac_tool_prefix}cc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2877,7 +3217,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_CC="${ac_tool_prefix}cc"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -2905,7 +3245,7 @@ if test -z "$CC"; then
 set dummy cc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2918,7 +3258,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     if test "$as_dir/$ac_word$ac_exec_ext" = "/usr/ucb/cc"; then
        ac_prog_rejected=yes
        continue
@@ -2964,7 +3304,7 @@ if test -z "$CC"; then
 set dummy $ac_tool_prefix$ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2976,7 +3316,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_CC="$ac_tool_prefix$ac_prog"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -3008,7 +3348,7 @@ do
 set dummy $ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_CC+set}" = set; then :
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_CC"; then
@@ -3020,7 +3360,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_ac_ct_CC="$ac_prog"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -3063,7 +3403,7 @@ fi
 test -z "$CC" && { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "no acceptable C compiler found in \$PATH
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
 
 # Provide some information about the compiler.
 $as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
@@ -3178,7 +3518,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error 77 "C compiler cannot create executables
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
@@ -3221,7 +3561,7 @@ else
   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "cannot compute suffix of executables: cannot compile and link
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
 fi
 rm -f conftest conftest$ac_cv_exeext
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_exeext" >&5
@@ -3280,7 +3620,7 @@ $as_echo "$ac_try_echo"; } >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "cannot run C compiled programs.
 If you meant to cross compile, use \`--host'.
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
     fi
   fi
 fi
@@ -3291,7 +3631,7 @@ rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out
 ac_clean_files=$ac_clean_files_save
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5
 $as_echo_n "checking for suffix of object files... " >&6; }
-if test "${ac_cv_objext+set}" = set; then :
+if ${ac_cv_objext+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3332,7 +3672,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "cannot compute suffix of object files: cannot compile
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
 fi
 rm -f conftest.$ac_cv_objext conftest.$ac_ext
 fi
@@ -3342,7 +3682,7 @@ OBJEXT=$ac_cv_objext
 ac_objext=$OBJEXT
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C compiler" >&5
 $as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
-if test "${ac_cv_c_compiler_gnu+set}" = set; then :
+if ${ac_cv_c_compiler_gnu+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3379,7 +3719,7 @@ ac_test_CFLAGS=${CFLAGS+set}
 ac_save_CFLAGS=$CFLAGS
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
 $as_echo_n "checking whether $CC accepts -g... " >&6; }
-if test "${ac_cv_prog_cc_g+set}" = set; then :
+if ${ac_cv_prog_cc_g+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_save_c_werror_flag=$ac_c_werror_flag
@@ -3457,7 +3797,7 @@ else
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
 $as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
-if test "${ac_cv_prog_cc_c89+set}" = set; then :
+if ${ac_cv_prog_cc_c89+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_cv_prog_cc_c89=no
@@ -3466,8 +3806,7 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdarg.h>
 #include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
+struct stat;
 /* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */
 struct buf { int x; };
 FILE * (*rcsopen) (struct buf *, struct stat *, int);
@@ -3565,7 +3904,7 @@ if test -n "$CPP" && test -d "$CPP"; then
   CPP=
 fi
 if test -z "$CPP"; then
-  if test "${ac_cv_prog_CPP+set}" = set; then :
+  if ${ac_cv_prog_CPP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
       # Double quotes because CPP needs to be expanded
@@ -3681,7 +4020,7 @@ else
   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "C preprocessor \"$CPP\" fails sanity check
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
 fi
 
 ac_ext=c
@@ -3693,7 +4032,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
 $as_echo_n "checking for grep that handles long lines and -e... " >&6; }
-if test "${ac_cv_path_GREP+set}" = set; then :
+if ${ac_cv_path_GREP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -z "$GREP"; then
@@ -3707,7 +4046,7 @@ do
     for ac_prog in grep ggrep; do
     for ac_exec_ext in '' $ac_executable_extensions; do
       ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
-      { test -f "$ac_path_GREP" && $as_test_x "$ac_path_GREP"; } || continue
+      as_fn_executable_p "$ac_path_GREP" || continue
 # Check for GNU ac_path_GREP and select it if it is found.
   # Check for GNU $ac_path_GREP
 case `"$ac_path_GREP" --version 2>&1` in
@@ -3756,7 +4095,7 @@ $as_echo "$ac_cv_path_GREP" >&6; }
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
 $as_echo_n "checking for egrep... " >&6; }
-if test "${ac_cv_path_EGREP+set}" = set; then :
+if ${ac_cv_path_EGREP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
@@ -3773,7 +4112,7 @@ do
     for ac_prog in egrep; do
     for ac_exec_ext in '' $ac_executable_extensions; do
       ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
-      { test -f "$ac_path_EGREP" && $as_test_x "$ac_path_EGREP"; } || continue
+      as_fn_executable_p "$ac_path_EGREP" || continue
 # Check for GNU ac_path_EGREP and select it if it is found.
   # Check for GNU $ac_path_EGREP
 case `"$ac_path_EGREP" --version 2>&1` in
@@ -3823,7 +4162,7 @@ $as_echo "$ac_cv_path_EGREP" >&6; }
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }
-if test "${ac_cv_header_stdc+set}" = set; then :
+if ${ac_cv_header_stdc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3953,7 +4292,7 @@ done
 for ac_header in sys/acl.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "sys/acl.h" "ac_cv_header_sys_acl_h" "$ac_includes_default"
-if test "x$ac_cv_header_sys_acl_h" = x""yes; then :
+if test "x$ac_cv_header_sys_acl_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_SYS_ACL_H 1
 _ACEOF
@@ -3986,7 +4325,7 @@ if test -z "$CXX"; then
 set dummy $ac_tool_prefix$ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CXX+set}" = set; then :
+if ${ac_cv_prog_CXX+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CXX"; then
@@ -3998,7 +4337,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_CXX="$ac_tool_prefix$ac_prog"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -4030,7 +4369,7 @@ do
 set dummy $ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_CXX+set}" = set; then :
+if ${ac_cv_prog_ac_ct_CXX+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_CXX"; then
@@ -4042,7 +4381,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_prog_ac_ct_CXX="$ac_prog"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -4108,7 +4447,7 @@ done
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C++ compiler" >&5
 $as_echo_n "checking whether we are using the GNU C++ compiler... " >&6; }
-if test "${ac_cv_cxx_compiler_gnu+set}" = set; then :
+if ${ac_cv_cxx_compiler_gnu+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -4145,7 +4484,7 @@ ac_test_CXXFLAGS=${CXXFLAGS+set}
 ac_save_CXXFLAGS=$CXXFLAGS
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX accepts -g" >&5
 $as_echo_n "checking whether $CXX accepts -g... " >&6; }
-if test "${ac_cv_prog_cxx_g+set}" = set; then :
+if ${ac_cv_prog_cxx_g+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_save_cxx_werror_flag=$ac_cxx_werror_flag
@@ -4236,7 +4575,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking how to run the C++ preprocessor" >&5
 $as_echo_n "checking how to run the C++ preprocessor... " >&6; }
 if test -z "$CXXCPP"; then
-  if test "${ac_cv_prog_CXXCPP+set}" = set; then :
+  if ${ac_cv_prog_CXXCPP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
       # Double quotes because CXXCPP needs to be expanded
@@ -4352,7 +4691,7 @@ else
   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
 as_fn_error $? "C++ preprocessor \"$CXXCPP\" fails sanity check
-See \`config.log' for more details" "$LINENO" 5 ; }
+See \`config.log' for more details" "$LINENO" 5; }
 fi
 
 ac_ext=cpp
@@ -4365,7 +4704,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 for ac_header in selinux/selinux.h
 do :
   ac_fn_cxx_check_header_mongrel "$LINENO" "selinux/selinux.h" "ac_cv_header_selinux_selinux_h" "$ac_includes_default"
-if test "x$ac_cv_header_selinux_selinux_h" = x""yes; then :
+if test "x$ac_cv_header_selinux_selinux_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_SELINUX_SELINUX_H 1
 _ACEOF
@@ -4404,7 +4743,7 @@ else
   old_CPPFLAGS="$CPPFLAGS"
   CPPFLAGS="$CPPFLAGS -I$stp_root/include"
   ac_fn_cxx_check_header_mongrel "$LINENO" "stp/c_interface.h" "ac_cv_header_stp_c_interface_h" "$ac_includes_default"
-if test "x$ac_cv_header_stp_c_interface_h" = x""yes; then :
+if test "x$ac_cv_header_stp_c_interface_h" = xyes; then :
 
 else
 
@@ -4417,7 +4756,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for vc_setInterfaceFlags in -lstp" >&5
 $as_echo_n "checking for vc_setInterfaceFlags in -lstp... " >&6; }
-if test "${ac_cv_lib_stp_vc_setInterfaceFlags+set}" = set; then :
+if ${ac_cv_lib_stp_vc_setInterfaceFlags+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -4451,7 +4790,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_stp_vc_setInterfaceFlags" >&5
 $as_echo "$ac_cv_lib_stp_vc_setInterfaceFlags" >&6; }
-if test "x$ac_cv_lib_stp_vc_setInterfaceFlags" = x""yes; then :
+if test "x$ac_cv_lib_stp_vc_setInterfaceFlags" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBSTP 1
 _ACEOF
@@ -4541,7 +4880,7 @@ fi
 set dummy runtest; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_path_RUNTEST+set}" = set; then :
+if ${ac_cv_path_RUNTEST+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   case $RUNTEST in
@@ -4555,7 +4894,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
     ac_cv_path_RUNTEST="$as_dir/$ac_word$ac_exec_ext"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -4668,10 +5007,21 @@ $as_echo "$as_me: WARNING: cache variable $ac_var contains a newline" >&2;} ;;
      :end' >>confcache
 if diff "$cache_file" confcache >/dev/null 2>&1; then :; else
   if test -w "$cache_file"; then
-    test "x$cache_file" != "x/dev/null" &&
+    if test "x$cache_file" != "x/dev/null"; then
       { $as_echo "$as_me:${as_lineno-$LINENO}: updating cache $cache_file" >&5
 $as_echo "$as_me: updating cache $cache_file" >&6;}
-    cat confcache >$cache_file
+      if test ! -f "$cache_file" || test -h "$cache_file"; then
+	cat confcache >"$cache_file"
+      else
+        case $cache_file in #(
+        */* | ?:*)
+	  mv -f confcache "$cache_file"$$ &&
+	  mv -f "$cache_file"$$ "$cache_file" ;; #(
+        *)
+	  mv -f confcache "$cache_file" ;;
+	esac
+      fi
+    fi
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: not updating unwritable cache $cache_file" >&5
 $as_echo "$as_me: not updating unwritable cache $cache_file" >&6;}
@@ -4703,7 +5053,7 @@ LTLIBOBJS=$ac_ltlibobjs
 
 
 
-: ${CONFIG_STATUS=./config.status}
+: "${CONFIG_STATUS=./config.status}"
 ac_write_fail=0
 ac_clean_files_save=$ac_clean_files
 ac_clean_files="$ac_clean_files $CONFIG_STATUS"
@@ -4804,6 +5154,7 @@ fi
 IFS=" ""	$as_nl"
 
 # Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
 case $0 in #((
   *[\\/]* ) as_myself=$0 ;;
   *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
@@ -4999,16 +5350,16 @@ if (echo >conf$$.file) 2>/dev/null; then
     # ... but there are two gotchas:
     # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
     # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
-    # In both cases, we have to default to `cp -p'.
+    # In both cases, we have to default to `cp -pR'.
     ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
-      as_ln_s='cp -p'
+      as_ln_s='cp -pR'
   elif ln conf$$.file conf$$ 2>/dev/null; then
     as_ln_s=ln
   else
-    as_ln_s='cp -p'
+    as_ln_s='cp -pR'
   fi
 else
-  as_ln_s='cp -p'
+  as_ln_s='cp -pR'
 fi
 rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
 rmdir conf$$.dir 2>/dev/null
@@ -5068,28 +5419,16 @@ else
   as_mkdir_p=false
 fi
 
-if test -x / >/dev/null 2>&1; then
-  as_test_x='test -x'
-else
-  if ls -dL / >/dev/null 2>&1; then
-    as_ls_L_option=L
-  else
-    as_ls_L_option=
-  fi
-  as_test_x='
-    eval sh -c '\''
-      if test -d "$1"; then
-	test -d "$1/.";
-      else
-	case $1 in #(
-	-*)set "./$1";;
-	esac;
-	case `ls -ld'$as_ls_L_option' "$1" 2>/dev/null` in #((
-	???[sx]*):;;*)false;;esac;fi
-    '\'' sh
-  '
-fi
-as_executable_p=$as_test_x
+
+# as_fn_executable_p FILE
+# -----------------------
+# Test if FILE is an executable regular file.
+as_fn_executable_p ()
+{
+  test -f "$1" && test -x "$1"
+} # as_fn_executable_p
+as_test_x='test -x'
+as_executable_p=as_fn_executable_p
 
 # Sed expression to map a string onto a valid CPP name.
 as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
@@ -5111,7 +5450,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # values after options handling.
 ac_log="
 This file was extended by KLEE $as_me 0.01, which was
-generated by GNU Autoconf 2.67.  Invocation command line was
+generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
   CONFIG_HEADERS  = $CONFIG_HEADERS
@@ -5177,10 +5516,10 @@ cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
 KLEE config.status 0.01
-configured by $0, generated by GNU Autoconf 2.67,
+configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
-Copyright (C) 2010 Free Software Foundation, Inc.
+Copyright (C) 2012 Free Software Foundation, Inc.
 This config.status script is free software; the Free Software Foundation
 gives unlimited permission to copy, distribute and modify it."
 
@@ -5268,7 +5607,7 @@ fi
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 if \$ac_cs_recheck; then
-  set X '$SHELL' '$0' $ac_configure_args \$ac_configure_extra_args --no-create --no-recursion
+  set X $SHELL '$0' $ac_configure_args \$ac_configure_extra_args --no-create --no-recursion
   shift
   \$as_echo "running CONFIG_SHELL=$SHELL \$*" >&6
   CONFIG_SHELL='$SHELL'
@@ -5315,7 +5654,7 @@ do
     "tools/Makefile") CONFIG_COMMANDS="$CONFIG_COMMANDS tools/Makefile" ;;
     "unittests/Makefile") CONFIG_COMMANDS="$CONFIG_COMMANDS unittests/Makefile" ;;
 
-  *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5 ;;
+  *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
   esac
 done
 
@@ -5338,9 +5677,10 @@ fi
 # after its creation but before its name has been assigned to `$tmp'.
 $debug ||
 {
-  tmp=
+  tmp= ac_tmp=
   trap 'exit_status=$?
-  { test -z "$tmp" || test ! -d "$tmp" || rm -fr "$tmp"; } && exit $exit_status
+  : "${ac_tmp:=$tmp}"
+  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status
 ' 0
   trap 'as_fn_exit 1' 1 2 13 15
 }
@@ -5348,12 +5688,13 @@ $debug ||
 
 {
   tmp=`(umask 077 && mktemp -d "./confXXXXXX") 2>/dev/null` &&
-  test -n "$tmp" && test -d "$tmp"
+  test -d "$tmp"
 }  ||
 {
   tmp=./conf$$-$RANDOM
   (umask 077 && mkdir "$tmp")
 } || as_fn_error $? "cannot create a temporary directory in ." "$LINENO" 5
+ac_tmp=$tmp
 
 # Set up the scripts for CONFIG_FILES section.
 # No need to generate them if there are no CONFIG_FILES.
@@ -5375,7 +5716,7 @@ else
   ac_cs_awk_cr=$ac_cr
 fi
 
-echo 'BEGIN {' >"$tmp/subs1.awk" &&
+echo 'BEGIN {' >"$ac_tmp/subs1.awk" &&
 _ACEOF
 
 
@@ -5403,7 +5744,7 @@ done
 rm -f conf$$subs.sh
 
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-cat >>"\$tmp/subs1.awk" <<\\_ACAWK &&
+cat >>"\$ac_tmp/subs1.awk" <<\\_ACAWK &&
 _ACEOF
 sed -n '
 h
@@ -5451,7 +5792,7 @@ t delim
 rm -f conf$$subs.awk
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 _ACAWK
-cat >>"\$tmp/subs1.awk" <<_ACAWK &&
+cat >>"\$ac_tmp/subs1.awk" <<_ACAWK &&
   for (key in S) S_is_set[key] = 1
   FS = ""
 
@@ -5483,7 +5824,7 @@ if sed "s/$ac_cr//" < /dev/null > /dev/null 2>&1; then
   sed "s/$ac_cr\$//; s/$ac_cr/$ac_cs_awk_cr/g"
 else
   cat
-fi < "$tmp/subs1.awk" > "$tmp/subs.awk" \
+fi < "$ac_tmp/subs1.awk" > "$ac_tmp/subs.awk" \
   || as_fn_error $? "could not setup config files machinery" "$LINENO" 5
 _ACEOF
 
@@ -5517,7 +5858,7 @@ fi # test -n "$CONFIG_FILES"
 # No need to generate them if there are no CONFIG_HEADERS.
 # This happens for instance with `./config.status Makefile'.
 if test -n "$CONFIG_HEADERS"; then
-cat >"$tmp/defines.awk" <<\_ACAWK ||
+cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
 BEGIN {
 _ACEOF
 
@@ -5529,8 +5870,8 @@ _ACEOF
 # handling of long lines.
 ac_delim='%!_!# '
 for ac_last_try in false false :; do
-  ac_t=`sed -n "/$ac_delim/p" confdefs.h`
-  if test -z "$ac_t"; then
+  ac_tt=`sed -n "/$ac_delim/p" confdefs.h`
+  if test -z "$ac_tt"; then
     break
   elif $ac_last_try; then
     as_fn_error $? "could not make $CONFIG_HEADERS" "$LINENO" 5
@@ -5631,7 +5972,7 @@ do
   esac
   case $ac_mode$ac_tag in
   :[FHL]*:*);;
-  :L* | :C*:*) as_fn_error $? "invalid tag \`$ac_tag'" "$LINENO" 5 ;;
+  :L* | :C*:*) as_fn_error $? "invalid tag \`$ac_tag'" "$LINENO" 5;;
   :[FH]-) ac_tag=-:-;;
   :[FH]*) ac_tag=$ac_tag:$ac_tag.in;;
   esac
@@ -5650,7 +5991,7 @@ do
     for ac_f
     do
       case $ac_f in
-      -) ac_f="$tmp/stdin";;
+      -) ac_f="$ac_tmp/stdin";;
       *) # Look for the file first in the build tree, then in the source tree
 	 # (if the path is not absolute).  The absolute path cannot be DOS-style,
 	 # because $ac_f cannot contain `:'.
@@ -5659,7 +6000,7 @@ do
 	   [\\/$]*) false;;
 	   *) test -f "$srcdir/$ac_f" && ac_f="$srcdir/$ac_f";;
 	   esac ||
-	   as_fn_error 1 "cannot find input file: \`$ac_f'" "$LINENO" 5 ;;
+	   as_fn_error 1 "cannot find input file: \`$ac_f'" "$LINENO" 5;;
       esac
       case $ac_f in *\'*) ac_f=`$as_echo "$ac_f" | sed "s/'/'\\\\\\\\''/g"`;; esac
       as_fn_append ac_file_inputs " '$ac_f'"
@@ -5685,8 +6026,8 @@ $as_echo "$as_me: creating $ac_file" >&6;}
     esac
 
     case $ac_tag in
-    *:-:* | *:-) cat >"$tmp/stdin" \
-      || as_fn_error $? "could not create $ac_file" "$LINENO" 5  ;;
+    *:-:* | *:-) cat >"$ac_tmp/stdin" \
+      || as_fn_error $? "could not create $ac_file" "$LINENO" 5 ;;
     esac
     ;;
   esac
@@ -5811,21 +6152,22 @@ s&@abs_builddir@&$ac_abs_builddir&;t t
 s&@abs_top_builddir@&$ac_abs_top_builddir&;t t
 $ac_datarootdir_hack
 "
-eval sed \"\$ac_sed_extra\" "$ac_file_inputs" | $AWK -f "$tmp/subs.awk" >$tmp/out \
-  || as_fn_error $? "could not create $ac_file" "$LINENO" 5
+eval sed \"\$ac_sed_extra\" "$ac_file_inputs" | $AWK -f "$ac_tmp/subs.awk" \
+  >$ac_tmp/out || as_fn_error $? "could not create $ac_file" "$LINENO" 5
 
 test -z "$ac_datarootdir_hack$ac_datarootdir_seen" &&
-  { ac_out=`sed -n '/\${datarootdir}/p' "$tmp/out"`; test -n "$ac_out"; } &&
-  { ac_out=`sed -n '/^[	 ]*datarootdir[	 ]*:*=/p' "$tmp/out"`; test -z "$ac_out"; } &&
+  { ac_out=`sed -n '/\${datarootdir}/p' "$ac_tmp/out"`; test -n "$ac_out"; } &&
+  { ac_out=`sed -n '/^[	 ]*datarootdir[	 ]*:*=/p' \
+      "$ac_tmp/out"`; test -z "$ac_out"; } &&
   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $ac_file contains a reference to the variable \`datarootdir'
 which seems to be undefined.  Please make sure it is defined" >&5
 $as_echo "$as_me: WARNING: $ac_file contains a reference to the variable \`datarootdir'
 which seems to be undefined.  Please make sure it is defined" >&2;}
 
-  rm -f "$tmp/stdin"
+  rm -f "$ac_tmp/stdin"
   case $ac_file in
-  -) cat "$tmp/out" && rm -f "$tmp/out";;
-  *) rm -f "$ac_file" && mv "$tmp/out" "$ac_file";;
+  -) cat "$ac_tmp/out" && rm -f "$ac_tmp/out";;
+  *) rm -f "$ac_file" && mv "$ac_tmp/out" "$ac_file";;
   esac \
   || as_fn_error $? "could not create $ac_file" "$LINENO" 5
  ;;
@@ -5836,20 +6178,20 @@ which seems to be undefined.  Please make sure it is defined" >&2;}
   if test x"$ac_file" != x-; then
     {
       $as_echo "/* $configure_input  */" \
-      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs"
-    } >"$tmp/config.h" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
+    } >"$ac_tmp/config.h" \
       || as_fn_error $? "could not create $ac_file" "$LINENO" 5
-    if diff "$ac_file" "$tmp/config.h" >/dev/null 2>&1; then
+    if diff "$ac_file" "$ac_tmp/config.h" >/dev/null 2>&1; then
       { $as_echo "$as_me:${as_lineno-$LINENO}: $ac_file is unchanged" >&5
 $as_echo "$as_me: $ac_file is unchanged" >&6;}
     else
       rm -f "$ac_file"
-      mv "$tmp/config.h" "$ac_file" \
+      mv "$ac_tmp/config.h" "$ac_file" \
 	|| as_fn_error $? "could not create $ac_file" "$LINENO" 5
     fi
   else
     $as_echo "/* $configure_input  */" \
-      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
       || as_fn_error $? "could not create -" "$LINENO" 5
   fi
  ;;