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Before, we would use gtest_main as provided by either LLVM or Google
Test itself; the TestMain.cpp was ignored (contrary to its source code
comment). In newer versions of Google Test (1.8.1+), gtest_main uses
`__FILE__` for its "Running main() from" line, but llvm-lit (which we
use to invoke unit tests) currently matches exactly "Running main()
from gtest_main.cc" for determining whether to skip this line. This
results in spurious "tests" that will be shown as unresolved.
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Fixes an issue that occurs with USE_CMAKE_FIND_PACKAGE_LLVM=ON
and LLVM compiled from sources, which then exports gtest and
gtest_main targets.
In case gtest and gtest_main targets are not imported from LLVM
and GTEST_SRC_DIR is not set, CMake can now reuse the googletest
sources from LLVM_BUILD_MAIN_SRC_DIR (if available) with
USE_CMAKE_FIND_PACKAGE_LLVM=ON. This last limitation is due to
LLVM making modifications to the CMakeLists.txt of googletest
that requires add_llvm_library() from AddLLVM.cmake.
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- Lots more tweaks, documentation, and web page content is needed,
but this should compile & work on OS X & Linux.
git-svn-id: https://llvm.org/svn/llvm-project/klee/trunk@72205 91177308-0d34-0410-b5e6-96231b3b80d8
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