1# This CMake module is responsible for setting the standard library to libc++
2# if the user has requested it.
3
4if(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()
35endif()
36