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 include(DetermineGCCCompatible)
   5
   6 if(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()
  32 endif()