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cmake: Improve compiler flag detection

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Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Andreas Schneider
2018-08-24 07:43:04 +02:00
parent 119a457357
commit a97e227a9d
1 changed files with 29 additions and 19 deletions
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48
CompilerChecks.cmake
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@ -2,6 +2,20 @@ include(AddCCompilerFlag)
include(CheckCCompilerFlagSSP)
if (UNIX)
#
# Check for -Werror turned on if possible
#
# This will prevent that compiler flags are detected incorrectly.
#
check_c_compiler_flag("-Werror" REQUIRED_FLAGS_WERROR)
if (REQUIRED_FLAGS_WERROR)
set(CMAKE_REQUIRED_FLAGS "-Werror")
if (PICKY_DEVELOPER)
list(APPEND SUPPORTED_COMPILER_FLAGS "-Werror")
endif()
endif()
add_c_compiler_flag("-std=gnu99" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-pedantic" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-pedantic-errors" SUPPORTED_COMPILER_FLAGS)
@ -28,28 +42,20 @@ if (UNIX)
add_c_compiler_flag("-Werror=strict-overflow" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-Wstrict-overflow=2" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-Wno-format-zero-length" SUPPORTED_COMPILER_FLAGS)
check_c_compiler_flag("-Wformat" REQUIRED_FLAGS_WFORMAT)
if (REQUIRED_FLAGS_WFORMAT)
list(APPEND SUPPORTED_COMPILER_FLAGS "-Wformat")
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Wformat")
endif()
add_c_compiler_flag("-Wformat-security" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-Werror=format-security" SUPPORTED_COMPILER_FLAGS)
#
# Check for -f options with -Werror turned on if possible
#
# This will prevent that compiler flags are detected incorrectly.
#
check_c_compiler_flag("-Werror" REQUIRED_FLAGS_WERROR)
if (REQUIRED_FLAGS_WERROR)
set(CMAKE_REQUIRED_FLAGS "-Werror")
endif()
# Allow zero for a variadic macro argument
add_c_compiler_flag("-Wno-gnu-zero-variadic-macro-arguments" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-fno-common" SUPPORTED_COMPILER_FLAGS)
check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
if (WITH_STACK_PROTECTOR)
list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector")
endif()
unset(CMAKE_REQUIRED_FLAGS)
if (CMAKE_BUILD_TYPE)
string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
@ -57,14 +63,18 @@ if (UNIX)
endif()
endif()
check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
if (WITH_STACK_PROTECTOR)
list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector")
endif()
if (PICKY_DEVELOPER)
add_c_compiler_flag("-Werror" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-Wno-error=deprecated-declarations" SUPPORTED_COMPILER_FLAGS)
add_c_compiler_flag("-Wno-error=tautological-compare" SUPPORTED_COMPILER_FLAGS)
endif()
# Allow zero for a variadic macro argument
add_c_compiler_flag("-Wno-gnu-zero-variadic-macro-arguments" SUPPORTED_COMPILER_FLAGS)
# Unset CMAKE_REQUIRED_FLAGS
unset(CMAKE_REQUIRED_FLAGS)
endif()
if (MSVC)