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|
include(CheckCCompilerFlag)
# C++17 Support
if(NOT ANDROID)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
# Position Independent Code
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
# Ccache support
if(ANDROID OR UNIX OR APPLE)
find_program(CCACHE_FOUND ccache)
set(CCACHE_SUPPORT OFF CACHE BOOL "Enable ccache support")
if((CCACHE_FOUND OR ANDROID) AND CCACHE_SUPPORT MATCHES ON)
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
endif()
endif()
# Add security (hardening flags)
if(UNIX OR APPLE OR ANDROID)
# Older compilers are predefining _FORTIFY_SOURCE, so defining it causes a
# warning, which is then considered an error. Second issue is that for
# these compilers, _FORTIFY_SOURCE must be used while optimizing, else
# causes a warning, which also results in an error. And finally, CMake is
# not using optimization when testing for libraries, hence breaking the build.
check_c_compiler_flag("-Werror -D_FORTIFY_SOURCE=2" COMPATIBLE_FORTIFY_SOURCE)
if(
COMPATIBLE_FORTIFY_SOURCE
AND NOT CMAKE_BUILD_TYPE MATCHES "Debug"
)
set(SEC_COMP_FLAGS "-D_FORTIFY_SOURCE=2")
endif()
set(SEC_COMP_FLAGS "${SEC_COMP_FLAGS} -fstack-protector-all -fPIE")
# Make sure to add optimization flag. Some systems require this for _FORTIFY_SOURCE.
if(
NOT CMAKE_BUILD_TYPE MATCHES "MinSizeRel"
AND NOT CMAKE_BUILD_TYPE MATCHES "Release"
AND NOT CMAKE_BUILD_TYPE MATCHES "Debug"
)
set(SEC_COMP_FLAGS "${SEC_COMP_FLAGS} -O1")
endif()
if(
NOT ANDROID
AND NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"
AND NOT APPLE
AND NOT CYGWIN
)
set(SEC_COMP_FLAGS "${SEC_COMP_FLAGS} -Wa,--noexecstack")
endif()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SEC_COMP_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SEC_COMP_FLAGS}")
set(SEC_LINK_FLAGS "")
if(NOT APPLE AND NOT CYGWIN)
set(
SEC_LINK_FLAGS
"${SEC_LINK_FLAGS} -Wl,-z,nodump -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now"
)
endif()
if(NOT ANDROID AND NOT APPLE)
set(SEC_LINK_FLAGS "${SEC_LINK_FLAGS} -pie")
endif()
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${SEC_LINK_FLAGS}")
set(
CMAKE_SHARED_LINKER_FLAGS
"${CMAKE_SHARED_LINKER_FLAGS} ${SEC_LINK_FLAGS} "
)
endif()
# Warning, debug and linker flags
set(
FIX_WARNINGS
OFF
CACHE BOOL
"Enable strict compilation mode to turn compiler warnings to errors"
)
if(UNIX OR APPLE)
set(COMP_FLAGS "")
set(LINKER_FLAGS "")
# Verbose warnings and turns all to errors
set(COMP_FLAGS "${COMP_FLAGS} -Wall -Wextra")
if(FIX_WARNINGS)
set(COMP_FLAGS "${COMP_FLAGS} -Werror")
endif()
# Omit problematic warnings
if(
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU"
AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.9.9
)
set(COMP_FLAGS "${COMP_FLAGS} -Wno-format-truncation")
endif()
check_c_compiler_flag(
"-Werror=stringop-truncation"
COMPATIBLE_STRINGOP_TRUNCATION
)
if(${COMPATIBLE_STRINGOP_TRUNCATION})
set(COMP_FLAGS "${COMP_FLAGS} -Werror=stringop-truncation")
endif()
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
set(COMP_FLAGS "${COMP_FLAGS} -Wno-nonnull -Wno-deprecated-declarations")
endif()
check_c_compiler_flag("-Werror=unused-parameter" COMPATIBLE_UNUSED_PARAMETER)
if(${COMPATIBLE_UNUSED_PARAMETER})
set(COMP_FLAGS "${COMP_FLAGS} -Werror=unused-parameter")
endif()
check_c_compiler_flag(
"-Werror=unused-but-set-variable"
COMPATIBLE_UNUSED_BUT_SET_VARIABLE
)
if(${COMPATIBLE_UNUSED_BUT_SET_VARIABLE})
set(COMP_FLAGS "${COMP_FLAGS} -Werror=unused-but-set-variable")
endif()
# Minimal debug info with Clang
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
set(COMP_FLAGS "${COMP_FLAGS} -gline-tables-only")
else()
set(COMP_FLAGS "${COMP_FLAGS} -g")
endif()
# Note: The following flags are problematic on older systems with gcc 4.8
if(
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"
OR
(
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU"
AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.9.9
)
)
if(
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang"
OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang"
)
set(COMP_FLAGS "${COMP_FLAGS} -Wno-unused-command-line-argument")
endif()
find_program(LDGOLD_FOUND ld.gold)
set(LDGOLD_SUPPORT OFF CACHE BOOL "Enable ld.gold support")
# Optional ld.gold is 2x faster than normal ld
if(
LDGOLD_FOUND
AND LDGOLD_SUPPORT MATCHES ON
AND NOT APPLE
AND NOT CMAKE_SYSTEM_PROCESSOR MATCHES arm
)
set(LINKER_FLAGS "${LINKER_FLAGS} -fuse-ld=gold")
# Use Identical Code Folding
set(COMP_FLAGS "${COMP_FLAGS} -ffunction-sections")
set(LINKER_FLAGS "${LINKER_FLAGS} -Wl,--icf=safe")
# Compress the debug sections
# Note: Before valgrind 3.12.0, patch should be applied for valgrind (https://bugs.kde.org/show_bug.cgi?id=303877)
if(
NOT APPLE
AND NOT ANDROID
AND NOT CMAKE_SYSTEM_PROCESSOR MATCHES arm
AND NOT CMAKE_CXX_CLANG_TIDY
)
set(COMP_FLAGS "${COMP_FLAGS} -Wa,--compress-debug-sections")
set(LINKER_FLAGS "${LINKER_FLAGS} -Wl,--compress-debug-sections=zlib")
endif()
endif()
endif()
# Apply the flags
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${COMP_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMP_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${LINKER_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${LINKER_FLAGS} -shared")
endif()
# Sanitizer support
set(CLANG_SANITIZERS OFF CACHE BOOL "Clang's sanitizer support")
if(
CLANG_SANITIZERS
AND
(
(UNIX AND "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
OR
(APPLE AND "${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
)
)
set(
CMAKE_C_FLAGS
"${CMAKE_C_FLAGS} -fsanitize=address,undefined -fno-omit-frame-pointer"
)
set(
CMAKE_CXX_FLAGS
"${CMAKE_CXX_FLAGS} -fsanitize=address,undefined -fno-omit-frame-pointer"
)
set(
CMAKE_EXE_LINKER_FLAGS
"${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address,undefined -fno-omit-frame-pointer"
)
set(
CMAKE_SHARED_LINKER_FLAGS
"${CMAKE_SHARED_LINKER_FLAGS} -fsanitize=address,undefined -fno-omit-frame-pointer"
)
endif()
# Unity Build support
include(UnityBuild)
|
