I'm trying to compile libcxxabi with cmake, and running into issues. I believe that this is because I don't have a separate copy of llvm installed that has llvm-config. So I've checked out llvm, and am trying to build that with cmake. I get the error:
CMake Error at cmake/modules/HandleLLVMOptions.cmake:37 (message):
Host Clang must be able to find libstdc++4.7 or newer!
And cmake/modules/HandleLLVMOptions.cmake:37 is literally a block like:
check_cxx_source_compiles("
#include <atomic>
std::atomic<float> x(0.0f);
int main() { return (float)x; }"
LLVM_NO_OLD_LIBSTDCXX)
if(NOT LLVM_NO_OLD_LIBSTDCXX)
message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!")
endif()
and if I try to compile the 3 liner with the compiler flag -std=c++0x (which is higher up in the cmake file) I get the error:
atomic.cpp:1:10: fatal error: 'atomic' file not found
#include <atomic>
^
1 error generated.
How is it that I don't have support for c++11 atomics? I'm running OSX 10.8.5, upgraded from 10.8.4, and XCode version 5.1.1, and clang++ 5.1 (clang-503.0.40) (based on LLVM 3.4svn). I have no options to upgrade xcode in the app store, nor the developer tools. Do I need to reinstall XCode, or upgrade to Mavericks?
I needed to check out all of LLVM and pass an additonal command line argument to CMake.
svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
cd llvm/tools
svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
cd ../projects
svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
cd ..
mkdir build
cd build
cmake .. -DLLVM_ENABLE_LIBCXX=ON
make
make install