1# This CMake module is responsible for setting the standard library to libc++ 2# if the user has requested it. 3 4include(DetermineGCCCompatible) 5 6if(NOT DEFINED LLVM_STDLIB_HANDLED) 7 set(LLVM_STDLIB_HANDLED ON) 8 9 function(append value) 10 foreach(variable ${ARGN}) 11 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 12 endforeach(variable) 13 endfunction() 14 15 include(CheckCXXCompilerFlag) 16 include(CheckLinkerFlag) 17 if(LLVM_ENABLE_LIBCXX) 18 if(LLVM_COMPILER_IS_GCC_COMPATIBLE) 19 check_cxx_compiler_flag("-stdlib=libc++" CXX_COMPILER_SUPPORTS_STDLIB) 20 check_linker_flag("-stdlib=libc++" CXX_LINKER_SUPPORTS_STDLIB) 21 if(CXX_COMPILER_SUPPORTS_STDLIB AND CXX_LINKER_SUPPORTS_STDLIB) 22 append("-stdlib=libc++" 23 CMAKE_CXX_FLAGS CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS 24 CMAKE_MODULE_LINKER_FLAGS) 25 else() 26 message(WARNING "Can't specify libc++ with '-stdlib='") 27 endif() 28 else() 29 message(WARNING "Not sure how to specify libc++ for this compiler") 30 endif() 31 endif() 32endif() 33