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Turn off uninitialized-use warnings for gcc in cmake build

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Added support to the cmake build to turn off uninitialized use warnings
for gcc. This cleans the build up somewhat.

Used logic simpler than found in autoconf by making use of the fact that
although gcc won't complain about unsupported -Wno-* flags it *will*
complain about unsupported -W flags.

Reviewers: gribozavr, doug.gregor, chandlerc
llvm-svn: 174299
This commit is contained in:
Edwin Vane 2013-02-04 02:32:44 +00:00
parent 7aba9cea00
commit 3e6897f32d
2 changed files with 24 additions and 0 deletions
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18
cmake/config-ix.cmake
View File

@ -305,6 +305,24 @@ include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-Wno-variadic-macros" SUPPORTS_NO_VARIADIC_MACROS_FLAG)
set(USE_NO_MAYBE_UNINITIALIZED 0)
set(USE_NO_UNINITIALIZED 0)
# Disable gcc's potentially uninitialized use analysis as it presents lots of
# false positives.
if (CMAKE_COMPILER_IS_GNUCXX)
check_cxx_compiler_flag("-Wmaybe-uninitialized" HAS_MAYBE_UNINITIALIZED)
if (HAS_MAYBE_UNINITIALIZED)
set(USE_NO_MAYBE_UNINITIALIZED 1)
else()
# Only recent versions of gcc make the distinction between -Wuninitialized
# and -Wmaybe-uninitialized. If -Wmaybe-uninitialized isn't supported, just
# turn off all uninitialized use warnings.
check_cxx_compiler_flag("-Wuninitialized" HAS_UNINITIALIZED)
set(USE_NO_UNINITIALIZED ${HAS_UNINITIALIZED})
endif()
endif()
include(GetHostTriple)
get_host_triple(LLVM_HOST_TRIPLE)

6
cmake/modules/HandleLLVMOptions.cmake
View File

@ -206,6 +206,12 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
if( C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wcovered-switch-default" )
endif()
if (USE_NO_UNINITIALIZED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-uninitialized")
endif()
if (USE_NO_MAYBE_UNINITIALIZED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-maybe-uninitialized")
endif()
endif (LLVM_ENABLE_WARNINGS)
if (LLVM_ENABLE_WERROR)
add_llvm_definitions( -Werror )