1 # This CMake module is responsible for setting the standard library to libc++ 2 # if the user has requested it. 3 4 if(NOT DEFINED LLVM_STDLIB_HANDLED) 5 set(LLVM_STDLIB_HANDLED ON) 6 7 if(CMAKE_COMPILER_IS_GNUCXX) 8 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 9 elseif( MSVC ) 10 set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF) 11 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) 13 endif() 14 15 function(append_if condition value) 16 if(${condition}) 17 foreach(variable ${ARGN}) 18 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 19 endforeach(variable) 20 endif() 21 endfunction() 22 23 include(CheckCXXCompilerFlag) 24 if(LLVM_ENABLE_LIBCXX) 25 if(LLVM_COMPILER_IS_GCC_COMPATIBLE) 26 check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB) 27 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS) 28 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS) 29 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS) 30 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS) 31 else() 32 message(WARNING "Not sure how to specify libc++ for this compiler") 33 endif() 34 endif() 35 endif() 36
