CODEWITHSUNDEEP
linkerclang
Edward Z. Yang
Edward Z. Yang

Reputation: 26742

Undefined reference to std::condition_variable::notify_one GLIBCXX_3.4.11

I am attempting to build and link a library with Clang instead of the default GCC and I am getting the following linker error: 

/usr/bin/ld: build/temp.linux-x86_64-3.6/torch/csrc/autograd/engine.o: undefined reference to symbol '_ZNSt18condition_variable10notify_oneEv@@GLIBCXX_3.4.11'

My command is:

CC="clang-5.0" CXX="clang++-5.0"  LDSHARED="clang -shared" python setup.py install

Removing LDSHARED solves the problem but I need to link with clang, because in the full example CFLAGS contains flags that GCC does not recognize.

Upvotes: 3

Views: 6059

Answers (1)

Edward Z. Yang
Edward Z. Yang

Reputation: 26742

Clang is linking by default against libc++ (https://libcxx.llvm.org/docs/UsingLibcxx.html) rather than libstdc++, which the code seems to be built against. Adding LDFLAGS="-stdlib=libstdc++" solves the problem.

Upvotes: 2

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