[LLVMdev] CMake build maturity

Óscar Fuentes ofv at wanadoo.es
Wed May 27 08:58:55 PDT 2009

Paul Melis <llvm at assumetheposition.nl> writes:

> It seems that the llvm-config generated when building through CMake does
> not contain -lpthread on my 32-bit Core2Duo Gentoo Linux system (even
> though I configured with LLVM_ENABLE_PTHREADS). I get missing symbols
> during linking of e.g. the JIT tutorial code:


This should be fixed now. Now about this one:

> Adding -lpthread to the compile command manually fixes it, but there
> seem to be some more discrepancies between the output of llvm-config for
> a build using ./configure and one using CMake:
> melis at juggle2:~/c/llvm-svn> ./configure --prefix=/home/melis/llvm
> --enable-optimized
> melis at juggle2:~/c/llvm-svn> make install
> melis at juggle2:~/c/llvm-svn> which llvm-config
> /home/melis/llvm/bin/llvm-config
> melis at juggle2:~/c/llvm-svn> llvm-config --cxxflags --ldflags --libs core
> -I/home/melis/llvm/include  -D_DEBUG  -D_GNU_SOURCE
> -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -O3 -fomit-frame-pointer
> -fPIC  -Woverloaded-virtual
> -L/home/melis/llvm/lib  -lpthread -ldl -lm -lelf
> -lLLVMCore -lLLVMSupport -lLLVMSystem
> melis at juggle2:~/c/llvm-svn-build> cmake /home/melis/c/llvm-svn
> -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/home/melis/llvm-cmake
> melis at juggle2:~/c/llvm-svn-build> make install
> melis at juggle2:~/c/llvm-svn-build> which llvm-config
> /home/melis/llvm-cmake/bin/llvm-config
> melis at juggle2:~/c/llvm-svn-build> llvm-config --cxxflags --ldflags
> --libs core
> -I/home/melis/llvm-cmake/include -O3 -DNDEBUG  -D_GNU_SOURCE
> -L/home/melis/llvm-cmake/lib 
> -lLLVMCore -lLLVMSupport -lLLVMSystem
> I'm actually also surprised about the _DEBUG versus NDEBUG difference...

I'm surprised too.

Question for those who know: why is _DEBUG and not NDEBUG defined on a
--enable-optimize'd build?


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