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cmakeclangldlibstdc++rpath
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Reputation: 313

clang++: rpath in executable not the same as in compiler configuration

I am installing clang from source using CMake. I have a gcc 4.9.2 installation in a non-system path e.g. /gcc/path/.

I use the recommended:

CC=... CXX=... cmake -DCMAKE_GCC_INSTALL_DIR=... -DCMAKE_EXE_LINKER_FLAGS="-Wl,-rpath,/gcc/path/lib64"

This compiles my sample code fine and when I

readelf -d clang++ | grep RPATH

it correctly outputs my specified rpath. However, the compiled object file doesn't contain any RPATH and gives me the error:

/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

I know the above error occurs because the library search path is not specified correctly. But I want to avoid setting LD_LIBRARY_PATH and wanted to pass the correct linker flags through cmake.

Interestingely when I compile using the following:

clang++ sample.cpp -std=c++11 -Wl,-rpath,/gcc/path/lib64

the executable does contain the correct rpath. I dont want to specify this compiler flag explicitly though and want the object file to use the rpath that the compiler was configured with. Is that possible through a cmake build? If so how?

Upvotes: 3

Views: 4960

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