[LLVMdev] CMake build maturity

[Paul Melis]

Hi Oscar,

Óscar Fuentes wrote:
> Paul Melis <llvm at assumetheposition.nl> writes:
>   
> [snip]
>
> Thanks! Fixed.
>
> BTW, bug reports are welcome.
>   
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:

12:20|melis at juggle2:~> c++ -g tut2.cpp `llvm-config --cxxflags --ldflags
--libs core` -o tut2
/home/melis/llvm-cmake/lib/libLLVMSystem.a(Mutex.cpp.o): In function
`llvm::sys::Mutex::tryacquire()':
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:144: undefined reference to
`pthread_mutex_trylock'
/home/melis/llvm-cmake/lib/libLLVMSystem.a(Mutex.cpp.o): In function
`Mutex':
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:69: undefined reference to
`pthread_mutexattr_init'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:75: undefined reference to
`pthread_mutexattr_settype'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:80: undefined reference to
`pthread_mutexattr_setpshared'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:88: undefined reference to
`pthread_mutexattr_destroy'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:69: undefined reference to
`pthread_mutexattr_init'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:75: undefined reference to
`pthread_mutexattr_settype'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:80: undefined reference to
`pthread_mutexattr_setpshared'
/home/melis/c/llvm-svn/lib/System/Mutex.cpp:88: undefined reference to
`pthread_mutexattr_destroy'
collect2: ld returned 1 exit status

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
-DLLVM_ENABLE_THREADS=ON
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
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
-L/home/melis/llvm-cmake/lib 
-lLLVMCore -lLLVMSupport -lLLVMSystem

I'm actually also surprised about the _DEBUG versus NDEBUG difference...

Paul