cmake/modules/HandleLLVMStdlib.cmake

   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()