HandleLLVMStdlib.cmake

# This CMake module is responsible for setting the standard library to libc++
# if the user has requested it.

include(DetermineGCCCompatible)

if(NOTDEFINED LLVM_STDLIB_HANDLED)
 set(LLVM_STDLIB_HANDLED ON)

 function(appendvalue)
 foreach(variable${ARGN})
 set(${variable}"${${variable}} ${value}" PARENT_SCOPE)
 endforeach(variable)
 endfunction()

 include(CheckCXXCompilerFlag)
 include(LLVMCheckLinkerFlag)
 set(LLVM_LIBCXX_USED 0)
 if(LLVM_ENABLE_LIBCXX)
 if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
 check_cxx_compiler_flag("-stdlib=libc++" CXX_COMPILER_SUPPORTS_STDLIB)
 llvm_check_linker_flag(CXX "-stdlib=libc++" CXX_LINKER_SUPPORTS_STDLIB)
 if(CXX_COMPILER_SUPPORTS_STDLIB AND CXX_LINKER_SUPPORTS_STDLIB)
append("-stdlib=libc++"
CMAKE_CXX_FLAGSCMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS
 CMAKE_MODULE_LINKER_FLAGS)
 set(LLVM_LIBCXX_USED 1)
 else()
 message(WARNING "Can't specify libc++ with '-stdlib='")
 endif()
 else()
 message(WARNING "Not sure how to specify libc++ for this compiler")
 endif()
 endif()

 if(LLVM_STATIC_LINK_CXX_STDLIB)
 if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
 check_cxx_compiler_flag("-static-libstdc++"
 CXX_COMPILER_SUPPORTS_STATIC_STDLIB)
 llvm_check_linker_flag(CXX "-static-libstdc++" CXX_LINKER_SUPPORTS_STATIC_STDLIB)
 if(CXX_COMPILER_SUPPORTS_STATIC_STDLIB AND
 CXX_LINKER_SUPPORTS_STATIC_STDLIB)
append("-static-libstdc++"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS
 CMAKE_MODULE_LINKER_FLAGS)
 else()
 message(WARNING
"Can't specify static linking for the C++ standard library")
 endif()
 else()
 message(WARNING "Not sure how to specify static linking of C++ standard "
"library for this compiler")
 endif()
 endif()
endif()