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# define system dependent compiler flags
include(CheckCCompilerFlag)
include(CheckCCompilerFlagSSP)
if (UNIX AND NOT WIN32)
#
# Define GNUCC compiler flags
#
if (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
# add -Wconversion ?
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-format-attribute -Wcast-align -Wcast-qual")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-missing-field-initializers")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=pointer-arith -Werror=declaration-after-statement")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=implicit-function-declaration -Werror=write-strings")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast")
# -Werror=strict-aliasing is broken
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstrict-aliasing -Wstrict-aliasing=2")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstrict-overflow -Wstrict-overflow=5 -Werror=strict-overflow")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_GNU_SOURCE")
if (OSX)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__APPLE_USE_RFC_3542")
endif (OSX)
# with -fPIC
check_c_compiler_flag("-fPIC" WITH_FPIC)
if (WITH_FPIC)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
endif (WITH_FPIC)
check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
if (WITH_STACK_PROTECTOR)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstack-protector")
endif (WITH_STACK_PROTECTOR)
if (CMAKE_BUILD_TYPE)
string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
check_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" WITH_FORTIFY_SOURCE)
if (WITH_FORTIFY_SOURCE)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
endif (WITH_FORTIFY_SOURCE)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=uninitialized")
endif()
endif()
endif (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
endif (UNIX AND NOT WIN32)
if (MSVC)
# Use secure functions by defaualt and suppress warnings about
#"deprecated" functions
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_NONSTDC_NO_WARNINGS=1 /D _CRT_SECURE_NO_WARNINGS=1")
endif (MSVC)
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