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[CMake] Add -stdlib=libc++ to host Clang build flags before performing any header search

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If LLVM_ENABLE_LIBCXX is specified, we should append -stdlib=libc++ to build
flags as early as possible, in particular, before we check for header presence
(as -stdlib=libc++ modifies header lookup rules). Otherwise we can find a header
at configure time (w/o -stdlib=libc++) but fail to find it at build time
(with -stdlib=libc++). See PR18569 for more details.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200744 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2014-02-04 07:55:18 +00:00
parent de2e0bc366
commit caeb7f94c7
3 changed files with 27 additions and 17 deletions
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8
CMakeLists.txt
View File

@ -272,6 +272,14 @@ option (LLVM_BUILD_DOCS "Build the llvm documentation." OFF)
option (LLVM_INCLUDE_DOCS "Generate build targets for llvm documentation." ON)
option (LLVM_ENABLE_DOXYGEN "Use doxygen to generate llvm documentation." OFF)
if( CMAKE_COMPILER_IS_GNUCXX )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
elseif( MSVC )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF)
elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
endif()
# All options referred to from HandleLLVMOptions have to be specified
# BEFORE this include, otherwise options will not be correctly set on
# first cmake run

21
cmake/config-ix.cmake
View File

@ -34,6 +34,25 @@ function(check_type_exists type files variable)
" ${variable})
endfunction()
function(append_if condition value)
if (${condition})
foreach(variable ${ARGN})
set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
endforeach(variable)
endif()
endfunction()
include(CheckCXXCompilerFlag)
if( LLVM_COMPILER_IS_GCC_COMPATIBLE )
if( LLVM_ENABLE_LIBCXX )
check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS)
endif()
endif()
# include checks
check_include_file_cxx(cxxabi.h HAVE_CXXABI_H)
check_include_file(dirent.h HAVE_DIRENT_H)
@ -317,8 +336,6 @@ if (LIBXML2_FOUND)
endif ()
endif ()
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-Wno-variadic-macros" SUPPORTS_NO_VARIADIC_MACROS_FLAG)
set(USE_NO_MAYBE_UNINITIALIZED 0)

15
cmake/modules/HandleLLVMOptions.cmake
View File

@ -6,14 +6,6 @@ include(AddLLVMDefinitions)
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
if( CMAKE_COMPILER_IS_GNUCXX )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
elseif( MSVC )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF)
elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
endif()
if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
@ -291,13 +283,6 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
append_if(CXX_SUPPORTS_CXX11 "-std=c++11" CMAKE_CXX_FLAGS)
endif (LLVM_ENABLE_CXX11)
if(LLVM_ENABLE_LIBCXX)
check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS)
append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS)
endif ()
endif( MSVC )
macro(append_common_sanitizer_flags)