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      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   if(LLVM_ENABLE_LIBCXX)
     17     if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
     18       check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
     19       if(CXX_SUPPORTS_STDLIB)
     20         append("-stdlib=libc++"
     21           CMAKE_CXX_FLAGS CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS
     22           CMAKE_MODULE_LINKER_FLAGS)
     23       else()
     24         message(WARNING "Can't specify libc++ with '-stdlib='")
     25       endif()
     26     else()
     27       message(WARNING "Not sure how to specify libc++ for this compiler")
     28     endif()
     29   endif()
     30 endif()
     31