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[CMake] Don't add flags this late and don't force libc++. Error if we know the compiler doesn't support c++11.

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llvm-svn: 171596
This commit is contained in:
Michael J. Spencer 2013-01-05 04:16:52 +00:00
parent 4a7c311008
commit c4048062e5
1 changed files with 17 additions and 20 deletions
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37
lld/CMakeLists.txt
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@ -68,29 +68,26 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
"`CMakeFiles'. Please delete them.") "`CMakeFiles'. Please delete them.")
endif() endif()
# # lld requires c++11 to build. Make sure that we have a compiler and standard
# lld now requires C++11 to build # library combination that can do that.
# if (MSVC11)
# set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") # Do nothing, we're good.
if (NOT MSVC) elseif (NOT MSVC)
include(CheckCXXCompilerFlag) # gcc and clang require the -std=c++0x or -std=c++11 flag.
check_cxx_compiler_flag("-std=c++0x" SUPPORTS_CXX11_FLAG) if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" OR
if( SUPPORTS_CXX11_FLAG ) "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
message(STATUS "Building with -std=c++0x") if (NOT ("${CMAKE_CXX_FLAGS}" MATCHES "-std=c\\+\\+0x" OR
set(CMAKE_CXX_FLAGS "-std=c++0x ${CMAKE_CXX_FLAGS}") "${CMAKE_CXX_FLAGS}" MATCHES "-std=c\\+\\+11"))
else( SUPPORTS_CXX11_FLAG ) message(FATAL_ERROR
message(WARNING "-std=c++0x not supported.") "lld requires c++11. Clang and gcc require -std=c++0x or -std=c++11 to "
endif() "enter this mode. Please set CMAKE_CXX_FLAGS accordingly.")
check_cxx_compiler_flag("-stdlib=libc++" SUPPORTS_LIBCXX_FLAG) endif()
if( SUPPORTS_LIBCXX_FLAG )
message(STATUS "Building with -stdlib=libc++")
set(CMAKE_CXX_FLAGS "-stdlib=libc++ ${CMAKE_CXX_FLAGS}")
else( SUPPORTS_LIBCXX_FLAG )
message(WARNING "-stdlib=libc++ not supported.")
endif() endif()
else()
message(FATAL_ERROR "The selected compiler does not support c++11 which is "
"required to build lld.")
endif() endif()
macro(add_lld_library name) macro(add_lld_library name)
llvm_process_sources(srcs ${ARGN}) llvm_process_sources(srcs ${ARGN})
if (MSVC_IDE OR XCODE) if (MSVC_IDE OR XCODE)