| # This CMake module is responsible for setting the standard library to libc++ |
| # if the user has requested it. |
| |
| if(NOT DEFINED LLVM_STDLIB_HANDLED) |
| set(LLVM_STDLIB_HANDLED ON) |
| |
| if(CMAKE_COMPILER_IS_GNUCXX) |
| set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) |
| elseif( MSVC ) |
| set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF) |
| elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) |
| set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON) |
| endif() |
| |
| function(append_if condition value) |
| if(${condition}) |
| foreach(variable ${ARGN}) |
| set(${variable} "${${variable}} ${value}" PARENT_SCOPE) |
| endforeach(variable) |
| endif() |
| endfunction() |
| |
| include(CheckCXXCompilerFlag) |
| if(LLVM_ENABLE_LIBCXX) |
| if(LLVM_COMPILER_IS_GCC_COMPATIBLE) |
| check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB) |
| append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS) |
| append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS) |
| append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS) |
| append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS) |
| else() |
| message(WARNING "Not sure how to specify libc++ for this compiler") |
| endif() |
| endif() |
| endif() |