Implement a CMake based build system for KLEE.

This is based off intial work by @jirislaby in #481. However it
has been substantially modified.

Notably it includes a separate build sytem to build the runtimes which
is inspired by the old build system. The reason for doing this is
because CMake is not well suited for building the runtime:

* CMake is configured to use the host compiler, not the bitcode
  compiler. These are not the same thing.

* Building the runtime using `add_custom_command()` is flawed
  because we can't automatically get transitive depencies (i.e.
  header file dependencies) unless the CMake generator is makefiles.
  (See `IMPLICIT_DEPENDS` of `add_custom_command()` in CMake).

So for now we have a very simple build system for building the runtimes.
In the future we can replace this with something more sophisticated if
we need it.

Support for all features of the old build system are implemented apart
from recording the git revision and showing it in the output of
`klee --help`.

Another notable change is the CMake build system works much better with
LLVM installs which don't ship with testing tools. The build system
will download the sources for `FileCheck` and `not` tools if the
corresponding binaries aren't available and will build them. However
`lit` (availabe via `pip install lit`) and GTest must already be
installed.

Apart from better support for testing a significant advantage of the
new CMake build system compared to the existing "Autoconf/Makefile"
build system is that it is **not** coupled to LLVM's build system
(unlike the existing build system). This means that LLVM's
autoconf/Makefiles don't need to be installed somewhere on the system.

Currently all tests pass.

Support has been implemented in TravisCI and the Dockerfile for
building with CMake.

The existing "Autoconf/Makefile" build system has been left intact
and so both build systems can coexist for a short while. We should
remove the old build system as soon as possible though because it
creates an unnecessary maintance burden.

2 files changed, 147 insertions, 63 deletions

diff --git a/.travis/klee.sh b/.travis/klee.sh
index 98dbbc0d..64bfcb67 100755
--- a/.travis/klee.sh
+++ b/.travis/klee.sh
@@ -34,10 +34,18 @@ if [ "${KLEE_UCLIBC}" != "0" ]; then
     cd klee-uclibc
     ./configure --make-llvm-lib --with-cc "${KLEE_CC}" --with-llvm-config /usr/bin/llvm-config-${LLVM_VERSION}
     make
-    KLEE_UCLIBC_CONFIGURE_OPTION="--with-uclibc=$(pwd) --enable-posix-runtime"
+    if [ "X${USE_CMAKE}" == "X1" ]; then
+      KLEE_UCLIBC_CONFIGURE_OPTION="-DENABLE_KLEE_UCLIBC=TRUE -DKLEE_UCLIBC_PATH=$(pwd) -DENABLE_POSIX_RUNTIME=TRUE"
+    else
+      KLEE_UCLIBC_CONFIGURE_OPTION="--with-uclibc=$(pwd) --enable-posix-runtime"
+    fi
     cd ../
 else
-    KLEE_UCLIBC_CONFIGURE_OPTION=""
+    if [ "X${USE_CMAKE}" == "X1" ]; then
+      KLEE_UCLIBC_CONFIGURE_OPTION="-DENABLE_KLEE_UCLIBC=FALSE -DENABLE_POSIX_RUNTIME=FALSE"
+    else
+      KLEE_UCLIBC_CONFIGURE_OPTION=""
+    fi
 fi
 
 COVERAGE_FLAGS=""
@@ -54,52 +62,110 @@ KLEE_STP_CONFIGURE_OPTION=""
 KLEE_METASMT_CONFIGURE_OPTION=""
 SOLVER_LIST=$(echo "${SOLVERS}" | sed 's/:/ /')
 
-for solver in ${SOLVER_LIST}; do
-  echo "Setting configuration option for ${solver}"
-  case ${solver} in
-  STP)
-    KLEE_STP_CONFIGURE_OPTION="--with-stp=${BUILD_DIR}/stp/build"
-    ;;
-  Z3)
-    echo "Z3"
-    KLEE_Z3_CONFIGURE_OPTION="--with-z3=/usr"
-    ;;
-  metaSMT)
-    echo "metaSMT"
-    KLEE_METASMT_CONFIGURE_OPTION="--with-metasmt=${BUILD_DIR}/metaSMT/build/root --with-metasmt-default-backend=${METASMT_DEFAULT}"
-    ;;
-  *)
-    echo "Unknown solver ${solver}"
-    exit 1
-  esac
-done
-
+if [ "X${USE_CMAKE}" == "X1" ]; then
+  # Set CMake configure options
+  for solver in ${SOLVER_LIST}; do
+    echo "Setting CMake configuration option for ${solver}"
+    case ${solver} in
+    STP)
+      KLEE_STP_CONFIGURE_OPTION="-DENABLE_SOLVER_STP=TRUE -DSTP_DIR=${BUILD_DIR}/stp/build"
+      ;;
+    Z3)
+      echo "Z3"
+      KLEE_Z3_CONFIGURE_OPTION="-DENABLE_SOLVER_Z3=TRUE"
+      ;;
+    metaSMT)
+      echo "metaSMT"
+      if [ "X${METASMT_DEFAULT}" == "X" ]; then
+        METASMT_DEFAULT=STP
+      fi
+      KLEE_METASMT_CONFIGURE_OPTION="-DENABLE_SOLVER_METASMT=TRUE -DmetaSMT_DIR=${BUILD_DIR}/metaSMT/build -DMETASMT_DEFAULT_BACKEND=${METASMT_DEFAULT}"
+      ;;
+    *)
+      echo "Unknown solver ${solver}"
+      exit 1
+    esac
+  done
+  TCMALLOC_OPTION=$([ "${USE_TCMALLOC:-0}" == 1 ] && echo "-DENABLE_TCMALLOC=TRUE" || echo "-DENABLE_TCMALLOC=FALSE")
+else
+  for solver in ${SOLVER_LIST}; do
+    echo "Setting configuration option for ${solver}"
+    case ${solver} in
+    STP)
+      KLEE_STP_CONFIGURE_OPTION="--with-stp=${BUILD_DIR}/stp/build"
+      ;;
+    Z3)
+      echo "Z3"
+      KLEE_Z3_CONFIGURE_OPTION="--with-z3=/usr"
+      ;;
+    metaSMT)
+      echo "metaSMT"
+      KLEE_METASMT_CONFIGURE_OPTION="--with-metasmt=${BUILD_DIR}/metaSMT/build/root --with-metasmt-default-backend=${METASMT_DEFAULT}"
+      ;;
+    *)
+      echo "Unknown solver ${solver}"
+      exit 1
+    esac
+  done
+
+  TCMALLOC_OPTION=$([ "${USE_TCMALLOC:-0}" == 1 ] && echo "--with-tcmalloc" || echo "--without-tcmalloc")
+fi
 
-TCMALLOC_OPTION=$([ "${USE_TCMALLOC:-0}" == 1 ] && echo "--with-tcmalloc" || echo "--without-tcmalloc")
 ###############################################################################
 # KLEE
 ###############################################################################
 mkdir klee
 cd klee
 
-# Build KLEE
-# Note: ENABLE_SHARED=0 is required because llvm-2.9 is incorectly packaged
-# and is missing the shared library that was supposed to be built that the build
-# system will try to use by default.
-${KLEE_SRC}/configure --with-llvmsrc=/usr/lib/llvm-${LLVM_VERSION}/build \
-            --with-llvmobj=/usr/lib/llvm-${LLVM_VERSION}/build \
-            --with-llvmcc=${KLEE_CC} \
-            --with-llvmcxx=${KLEE_CXX} \
-            ${KLEE_STP_CONFIGURE_OPTION} \
-            ${KLEE_Z3_CONFIGURE_OPTION} \
-            ${KLEE_METASMT_CONFIGURE_OPTION} \
-            ${KLEE_UCLIBC_CONFIGURE_OPTION} \
-            ${TCMALLOC_OPTION} \
-            CXXFLAGS="${COVERAGE_FLAGS}" \
-            && make DISABLE_ASSERTIONS=${DISABLE_ASSERTIONS} \
-                    ENABLE_OPTIMIZED=${ENABLE_OPTIMIZED} \
-                    ENABLE_SHARED=0
-
+if [ "X${USE_CMAKE}" == "X1" ]; then
+  GTEST_SRC_DIR="${BUILD_DIR}/test-utils/googletest-release-1.7.0/"
+  if [ "X${DISABLE_ASSERTIONS}" == "X1" ]; then
+    KLEE_ASSERTS_OPTION="-DENABLE_KLEE_ASSERTS=FALSE"
+  else
+    KLEE_ASSERTS_OPTION="-DENABLE_KLEE_ASSERTS=TRUE"
+  fi
+
+  if [ "X${ENABLE_OPTIMIZED}" == "X1" ]; then
+    CMAKE_BUILD_TYPE="RelWithDebInfo"
+  else
+    CMAKE_BUILD_TYPE="Debug"
+  fi
+  # Compute CMake build type
+  CXXFLAGS="${COVERAGE_FLAGS}" \
+  cmake \
+    -DLLVM_CONFIG_BINARY="/usr/lib/llvm-${LLVM_VERSION}/bin/llvm-config" \
+    -DLLVMCC="${KLEE_CC}" \
+    -DLLVMCXX="${KLEE_CXX}" \
+    ${KLEE_STP_CONFIGURE_OPTION} \
+    ${KLEE_Z3_CONFIGURE_OPTION} \
+    ${KLEE_METASMT_CONFIGURE_OPTION} \
+    ${KLEE_UCLIBC_CONFIGURE_OPTION} \
+    ${TCMALLOC_OPTION} \
+    -DGTEST_SRC_DIR=${GTEST_SRC_DIR} \
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} \
+    ${KLEE_ASSERTS_OPTION} \
+    -DENABLE_TESTS=TRUE \
+    -DLIT_ARGS="-v" \
+    ${KLEE_SRC} && make
+else
+  # Build KLEE
+  # Note: ENABLE_SHARED=0 is required because llvm-2.9 is incorectly packaged
+  # and is missing the shared library that was supposed to be built that the build
+  # system will try to use by default.
+  ${KLEE_SRC}/configure --with-llvmsrc=/usr/lib/llvm-${LLVM_VERSION}/build \
+              --with-llvmobj=/usr/lib/llvm-${LLVM_VERSION}/build \
+              --with-llvmcc=${KLEE_CC} \
+              --with-llvmcxx=${KLEE_CXX} \
+              ${KLEE_STP_CONFIGURE_OPTION} \
+              ${KLEE_Z3_CONFIGURE_OPTION} \
+              ${KLEE_METASMT_CONFIGURE_OPTION} \
+              ${KLEE_UCLIBC_CONFIGURE_OPTION} \
+              ${TCMALLOC_OPTION} \
+              CXXFLAGS="${COVERAGE_FLAGS}" \
+              && make DISABLE_ASSERTIONS=${DISABLE_ASSERTIONS} \
+                      ENABLE_OPTIMIZED=${ENABLE_OPTIMIZED} \
+                      ENABLE_SHARED=0
+fi
 ###############################################################################
 # Testing
 ###############################################################################
@@ -108,32 +174,42 @@ set +e # We want to let all the tests run before we exit
 ###############################################################################
 # Unit tests
 ###############################################################################
-# The unittests makefile doesn't seem to have been packaged so get it from SVN
-sudo mkdir -p /usr/lib/llvm-${LLVM_VERSION}/build/unittests/
-svn export  http://llvm.org/svn/llvm-project/llvm/branches/${SVN_BRANCH}/unittests/Makefile.unittest \
-    ../Makefile.unittest
-sudo mv ../Makefile.unittest /usr/lib/llvm-${LLVM_VERSION}/build/unittests/
-
-make unittests \
-    DISABLE_ASSERTIONS=${DISABLE_ASSERTIONS} \
-    ENABLE_OPTIMIZED=${ENABLE_OPTIMIZED} \
-    ENABLE_SHARED=0
-RETURN="$?"
+if [ "X${USE_CMAKE}" == "X1" ]; then
+  make unittests
+  RETURN="$?"
+else
+  # The unittests makefile doesn't seem to have been packaged so get it from SVN
+  sudo mkdir -p /usr/lib/llvm-${LLVM_VERSION}/build/unittests/
+  svn export  http://llvm.org/svn/llvm-project/llvm/branches/${SVN_BRANCH}/unittests/Makefile.unittest \
+      ../Makefile.unittest
+  sudo mv ../Makefile.unittest /usr/lib/llvm-${LLVM_VERSION}/build/unittests/
+
+  make unittests \
+      DISABLE_ASSERTIONS=${DISABLE_ASSERTIONS} \
+      ENABLE_OPTIMIZED=${ENABLE_OPTIMIZED} \
+      ENABLE_SHARED=0
+  RETURN="$?"
+fi
 
 ###############################################################################
 # lit tests
 ###############################################################################
-# Note can't use ``make check`` because llvm-lit is not available
-cd test
-# The build system needs to generate this file before we can run lit
-make lit.site.cfg \
-    DISABLE_ASSERTIONS=${DISABLE_ASSERTIONS} \
-    ENABLE_OPTIMIZED=${ENABLE_OPTIMIZED} \
-    ENABLE_SHARED=0
-
-set +e # We want to let all the tests run before we exit
-lit -v .
-RETURN="${RETURN}$?"
+if [ "X${USE_CMAKE}" == "X1" ]; then
+  make integrationtests
+  RETURN="${RETURN}$?"
+else
+  # Note can't use ``make check`` because llvm-lit is not available
+  cd test
+  # The build system needs to generate this file before we can run lit
+  make lit.site.cfg \
+      DISABLE_ASSERTIONS=${DISABLE_ASSERTIONS} \
+      ENABLE_OPTIMIZED=${ENABLE_OPTIMIZED} \
+      ENABLE_SHARED=0
+
+  set +e # We want to let all the tests run before we exit
+  lit -v .
+  RETURN="${RETURN}$?"
+fi
 
 #generate and upload coverage if COVERAGE is set
 if [ ${COVERAGE} -eq 1 ]; then
diff --git a/.travis/testing-utils.sh b/.travis/testing-utils.sh
index b2f608db..3d52457f 100755
--- a/.travis/testing-utils.sh
+++ b/.travis/testing-utils.sh
@@ -2,6 +2,14 @@
 # Make sure we exit if there is a failure
 set -e
 
+if [ "X${USE_CMAKE}" == "X1" ]; then
+    # The New CMake build system just needs the GTest sources regardless
+    # of LLVM version.
+    wget https://github.com/google/googletest/archive/release-1.7.0.zip
+    unzip release-1.7.0.zip
+    exit 0
+fi
+
 if [ "${LLVM_VERSION}" != "2.9" ]; then
     # Using LLVM3.4 all we need is vanilla GoogleTest :)
     wget https://github.com/google/googletest/archive/release-1.7.0.zip