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1b7969eee2
r200744 moved this into cmake/config-ix.cmake, so that it would happen very early in the build process. However, standalone builds of Clang and other external projects never include this file (which is correct). Now, -stdlib=libc++ and the LLVM_COMPILER_IS_GCC_COMPATIBLE option are both set in a new include file, HandleLLVMStdlib, which is included by both config-ix.cmake and HandleLLVMOptions.cmake. This preserves existing behavior for projects relying on HandleLLVMOptions and still does the right thing for builds of LLVM itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200811 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1.2 KiB
CMake
36 lines
1.2 KiB
CMake
# This CMake module is responsible for setting the standard library to libc++
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# if the user has requested it.
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if(NOT DEFINED LLVM_STDLIB_HANDLED)
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set(LLVM_STDLIB_HANDLED ON)
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if(CMAKE_COMPILER_IS_GNUCXX)
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set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
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elseif( MSVC )
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set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF)
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elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
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set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
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endif()
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function(append_if condition value)
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if(${condition})
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foreach(variable ${ARGN})
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set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
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endforeach(variable)
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endif()
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endfunction()
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include(CheckCXXCompilerFlag)
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if(LLVM_ENABLE_LIBCXX)
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if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
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check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
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append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS)
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append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS)
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append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS)
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append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS)
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else()
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message(WARNING "Not sure how to specify libc++ for this compiler")
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endif()
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endif()
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endif()
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