From 2f6e89baf9cd5f5292cd0aa6047144920a564202 Mon Sep 17 00:00:00 2001
From: Dan Liew <daniel.liew@imperial.ac.uk>
Date: Mon, 16 Dec 2013 01:23:07 +0000
Subject: klee-uclibc detection is now a lot cleaner. KLEE now assumes it can
 find klee-uclibc inside the same folder as the other runtime libraries with
 the name "klee-uclibc.bca"

This is implemented as follows:

* When building, a sym-link is created to klee-uclibc's libc.a file
  in the same directory that the rest of KLEE's runtime libraries
  are built. This done so that if a developer changes klee-uclibc
  on their system then the correct version of klee-uclibc is used
  by KLEE.

* When installing, klee-uclibc's libc.a file is installed in the same
  directory that the rest of KLEE's runtime libraries are installed.

In addition the configure script argument --with-uclibc can now
operate in two ways. It can either be passed the path to the root
of klee-uclibc or it can be passed a path to the libc.a file built
by klee-uclibc. This new behaviour has been added to allow users
to potential use pre-built versions of klee-uclibc.
---
 autoconf/configure.ac | 54 ++++++++++++++++++++++++++++++++-------------------
 1 file changed, 34 insertions(+), 20 deletions(-)

(limited to 'autoconf')

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index fd249103..5a47e924 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -341,38 +341,52 @@ dnl User option to enable uClibc support.
 
 AC_ARG_WITH(uclibc,
   AS_HELP_STRING([--with-uclibc],
-    [Enable use of the klee uclibc at the given path]),,)
-
-dnl If uclibc wasn't given, check for a uclibc in the current
-dnl directory.
-if (test X${with_uclibc} = X && test -d uclibc); then
-   with_uclibc=uclibc
-fi
+                 [Enable use of the klee uclibc at the given path (klee-uclibc root directory or libc.a file]),,)
 
 dnl Validate uclibc if given.
 
 AC_MSG_CHECKING([uclibc])
 if (test X${with_uclibc} != X); then
-   if test ! -d ${with_uclibc}; then
-       AC_MSG_ERROR([invalid uclibc directory: ${with_uclibc}])
+   if test  -d ${with_uclibc}; then
+      dnl Support the legacy way of configuring with 
+      dnl klee-uclibc, i.e. the root klee-uclibc
+      dnl directory is passed as an argument.
+
+      dnl Make the path absolute
+      with_uclibc=`cd $with_uclibc 2> /dev/null; pwd`
+
+      dnl create path to libc file
+      KLEE_UCLIBC_BCA="${with_uclibc}/lib/libc.a"
+
+      if test ! -e "${KLEE_UCLIBC_BCA}"; then
+      AC_MSG_ERROR([Could not find file ${KLEE_UCLIBC_BCA}])
+      fi
+   elif test -f ${with_uclibc}; then
+      dnl Support the new way of configuring klee-uclibc
+      dnl i.e. the built bitcode archive is passed as the
+      dnl argument.
+
+      dnl Get absolute path to file
+      _kud=`dirname ${with_uclibc}`
+      _kud=`cd ${_kud}; pwd 2> /dev/null`
+      _kuf=`basename ${with_uclibc}`
+
+      KLEE_UCLIBC_BCA="${_kud}/${_kuf}" 
+   else
+      AC_MSG_ERROR([Could not detect klee-uclibc])
    fi
 
-   dnl Make the path absolute
-   with_uclibc=`cd $with_uclibc 2> /dev/null; pwd`
+   dnl FIXME: Validate the libc.a file
 
-   AC_MSG_RESULT([$with_uclibc])
+   AC_MSG_RESULT([$KLEE_UCLIBC_BCA])
+   AC_SUBST(ENABLE_UCLIBC,[[1]])
+   AC_SUBST(KLEE_UCLIBC_BCA)
+   AC_DEFINE(SUPPORT_KLEE_UCLIBC, [[1]], [klee-uclibc is supported])
 else
    AC_MSG_RESULT([no])
+   AC_SUBST(ENABLE_UCLIBC,[[0]])
 fi
 
-AC_DEFINE_UNQUOTED(KLEE_UCLIBC, "$with_uclibc", [Path to KLEE's uClibc])
-AC_SUBST(KLEE_UCLIBC)         
-
-if test X${with_uclibc} != X ; then
-  AC_SUBST(ENABLE_UCLIBC,[[1]])
-else
-  AC_SUBST(ENABLE_UCLIBC,[[0]])
-fi
 
 dnl **************************************************************************
 dnl User option to enable the POSIX runtime
-- 
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