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Use CHECK_C_COMPILER_FLAG to determine if the compiler supports a flag

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This simplifies platform/compiler dependent checks where we optionally
enable features or disable warnings.
This commit is contained in:
Jacques Germishuys 2014-04-18 18:32:06 +02:00
parent 48ce93e08f
commit c6cd3f8bde
1 changed files with 43 additions and 9 deletions
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52
CMakeLists.txt
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@ -18,6 +18,7 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_LIST_DIR}/cmake/Modules/")
INCLUDE(CheckLibraryExists)
INCLUDE(CheckCCompilerFlag)
# Build options
#
@ -287,7 +288,7 @@ IF (MSVC)
# Precompiled headers
ELSE ()
SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra -Wno-missing-field-initializers -Wstrict-aliasing=2 -Wstrict-prototypes -Wdeclaration-after-statement ${CMAKE_C_FLAGS}")
SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra ${CMAKE_C_FLAGS}")
IF (WIN32 AND NOT CYGWIN)
SET(CMAKE_C_FLAGS_DEBUG "-D_DEBUG")
@ -301,16 +302,49 @@ ELSE ()
ADD_DEFINITIONS(-D__USE_MINGW_ANSI_STDIO=1)
ELSEIF (BUILD_SHARED_LIBS)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -fPIC")
ENDIF ()
IF (APPLE) # Apple deprecated OpenSSL
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated-declarations")
# With clang, disable some annoying extra warnings
IF (NOT CMAKE_COMPILER_IS_GNUCC)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-const-variable -Wno-unused-function")
CHECK_C_COMPILER_FLAG(-fvisibility=hidden HIDDEN_VISIBILITY_FLAG)
IF(HIDDEN_VISIBILITY_FLAG)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden")
ENDIF()
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
ENDIF ()
CHECK_C_COMPILER_FLAG(-Wno-missing-field-initializers NO_MISSING_FIELD_INIT_WARNING)
IF(NO_MISSING_FIELD_INIT_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-missing-field-initializers")
ENDIF()
CHECK_C_COMPILER_FLAG(-Wstrict-aliasing STRICT_ALIASING_WARNING)
IF(STRICT_ALIASING_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wstrict-aliasing=2")
ENDIF()
CHECK_C_COMPILER_FLAG(-Wstrict-prototypes STRICT_PROTOTYPES_WARNING)
IF(STRICT_PROTOTYPES_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wstrict-prototypes")
ENDIF()
CHECK_C_COMPILER_FLAG(-Wdeclaration-after-statement DECLARATION_AFTER_STATEMENT_WARNING)
IF(DECLARATION_AFTER_STATEMENT_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wdeclaration-after-statement")
ENDIF()
CHECK_C_COMPILER_FLAG(-Wno-unused-const-variable UNUSED_CONST_VAR_WARNING)
IF(UNUSED_CONST_VAR_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-const-variable")
ENDIF()
CHECK_C_COMPILER_FLAG(-Wno-unused-function UNUSED_FUNCTION_WARNING)
IF(UNUSED_FUNCTION_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function")
ENDIF()
CHECK_C_COMPILER_FLAG(-Wno-deprecated-declarations DEPRECATED_DECLARATIONS_WARNING)
IF(DEPRECATED_DECLARATIONS_WARNING)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated-declarations")
ENDIF()
IF (PROFILE)
SET(CMAKE_C_FLAGS "-pg ${CMAKE_C_FLAGS}")
SET(CMAKE_EXE_LINKER_FLAGS "-pg ${CMAKE_EXE_LINKER_FLAGS}")