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llvm-6502/cmake/modules/HandleLLVMOptions.cmake
Edwin Vane 4b5dbaa96a Turn off uninitialized-use warnings for gcc in cmake build 
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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174299 91177308-0d34-0410-b5e6-96231b3b80d8
2013-02-04 02:32:44 +00:00

224 lines
8.5 KiB
CMake
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# This CMake module is responsible for interpreting the user defined LLVM_
# options and executing the appropriate CMake commands to realize the users'
# selections.
include(AddLLVMDefinitions)
include(CheckCCompilerFlag)
if( CMAKE_COMPILER_IS_GNUCXX )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
endif()
if( LLVM_ENABLE_ASSERTIONS )
# MSVC doesn't like _DEBUG on release builds. See PR 4379.
if( NOT MSVC )
add_definitions( -D_DEBUG )
endif()
# On Release builds cmake automatically defines NDEBUG, so we
# explicitly undefine it:
if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
add_definitions( -UNDEBUG )
endif()
else()
if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
if( NOT MSVC_IDE AND NOT XCODE )
add_definitions( -DNDEBUG )
endif()
endif()
endif()
if(WIN32)
if(CYGWIN)
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 1)
else(CYGWIN)
set(LLVM_ON_WIN32 1)
set(LLVM_ON_UNIX 0)
endif(CYGWIN)
set(LTDL_SHLIB_EXT ".dll")
set(EXEEXT ".exe")
# Maximum path length is 160 for non-unicode paths
set(MAXPATHLEN 160)
else(WIN32)
if(UNIX)
set(LLVM_ON_WIN32 0)
set(LLVM_ON_UNIX 1)
if(APPLE)
set(LTDL_SHLIB_EXT ".dylib")
else(APPLE)
set(LTDL_SHLIB_EXT ".so")
endif(APPLE)
set(EXEEXT "")
# FIXME: Maximum path length is currently set to 'safe' fixed value
set(MAXPATHLEN 2024)
else(UNIX)
MESSAGE(SEND_ERROR "Unable to determine platform")
endif(UNIX)
endif(WIN32)
if( LLVM_ENABLE_PIC )
if( XCODE )
# Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
# know how to disable this, so just force ENABLE_PIC off for now.
message(WARNING "-fPIC not supported with Xcode.")
elseif( WIN32 OR CYGWIN)
# On Windows all code is PIC. MinGW warns if -fPIC is used.
else()
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-fPIC" SUPPORTS_FPIC_FLAG)
if( SUPPORTS_FPIC_FLAG )
message(STATUS "Building with -fPIC")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
else( SUPPORTS_FPIC_FLAG )
message(WARNING "-fPIC not supported.")
endif()
if( WIN32 OR CYGWIN)
# MinGW warns if -fvisibility-inlines-hidden is used.
else()
check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
if( SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility-inlines-hidden")
endif()
endif()
endif()
endif()
if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# TODO: support other platforms and toolchains.
if( LLVM_BUILD_32_BITS )
message(STATUS "Building 32 bits executables and libraries.")
add_llvm_definitions( -m32 )
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
endif( LLVM_BUILD_32_BITS )
endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
# On Win32 using MS tools, provide an option to set the number of parallel jobs
# to use.
if( MSVC_IDE )
set(LLVM_COMPILER_JOBS "0" CACHE STRING
"Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
if( LLVM_COMPILER_JOBS STREQUAL "0" )
add_llvm_definitions( /MP )
else()
if (MSVC10)
message(FATAL_ERROR
"Due to a bug in CMake only 0 and 1 is supported for "
"LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
else()
message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
endif()
endif()
else()
message(STATUS "Parallel compilation disabled")
endif()
endif()
if( MSVC )
include(ChooseMSVCCRT)
if( MSVC11 )
add_llvm_definitions(-D_VARIADIC_MAX=10)
endif()
# Add definitions that make MSVC much less annoying.
add_llvm_definitions(
# For some reason MS wants to deprecate a bunch of standard functions...
-D_CRT_SECURE_NO_DEPRECATE
-D_CRT_SECURE_NO_WARNINGS
-D_CRT_NONSTDC_NO_DEPRECATE
-D_CRT_NONSTDC_NO_WARNINGS
-D_SCL_SECURE_NO_DEPRECATE
-D_SCL_SECURE_NO_WARNINGS
# Disabled warnings.
-wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
-wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
-wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
-wd4181 # Suppress 'qualifier applied to reference type; ignored'
-wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
-wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
-wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
-wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
-wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
-wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
-wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
-wd4355 # Suppress ''this' : used in base member initializer list'
-wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
-wd4551 # Suppress 'function call missing argument list'
-wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
-wd4715 # Suppress ''function' : not all control paths return a value'
-wd4722 # Suppress ''function' : destructor never returns, potential memory leak'
-wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
# Promoted warnings.
-w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
# Promoted warnings to errors.
-we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
)
# Enable warnings
if (LLVM_ENABLE_WARNINGS)
add_llvm_definitions( /W4 )
if (LLVM_ENABLE_PEDANTIC)
# No MSVC equivalent available
endif (LLVM_ENABLE_PEDANTIC)
endif (LLVM_ENABLE_WARNINGS)
if (LLVM_ENABLE_WERROR)
add_llvm_definitions( /WX )
endif (LLVM_ENABLE_WERROR)
elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
if (LLVM_ENABLE_WARNINGS)
add_llvm_definitions( -Wall -W -Wno-unused-parameter -Wwrite-strings )
# Turn off missing field initializer warnings for gcc to avoid noise from
# false positives with empty {}. Turn them on otherwise (they're off by
# default for clang).
check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
if (CMAKE_COMPILER_IS_GNUCXX)
add_llvm_definitions( -Wno-missing-field-initializers )
else()
add_llvm_definitions( -Wmissing-field-initializers )
endif()
endif()
if (LLVM_ENABLE_PEDANTIC)
add_llvm_definitions( -pedantic -Wno-long-long )
check_cxx_compiler_flag("-Werror -Wnested-anon-types" CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG)
if( CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-nested-anon-types" )
endif()
endif (LLVM_ENABLE_PEDANTIC)
check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
if( CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wcovered-switch-default" )
endif()
check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
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 )
endif (LLVM_ENABLE_WERROR)
endif( MSVC )
add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
add_llvm_definitions( -D__STDC_FORMAT_MACROS )
add_llvm_definitions( -D__STDC_LIMIT_MACROS )
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