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include(CheckCCompilerFlag)
IF (NOT ${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
ENDIF ()
# Ccache support
IF (ANDROID OR UNIX OR APPLE)
FIND_PROGRAM(CCACHE_FOUND ccache)
SET(CCACHE_SUPPORT OFF CACHE BOOL "Enable ccache support")
IF ((CCACHE_FOUND OR ANDROID) AND CCACHE_SUPPORT MATCHES ON)
SET_PROPERTY(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
SET_PROPERTY(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
ENDIF ()
ENDIF ()
# Add security (hardening flags)
IF (UNIX OR APPLE OR ANDROID)
# Older compilers are predefining _FORTIFY_SOURCE, so defining it causes a
# warning, which is then considered an error. Second issue is that for
# these compilers, _FORTIFY_SOURCE must be used while optimizing, else
# causes a warning, which also results in an error. And finally, CMake is
# not using optimization when testing for libraries, hence breaking the build.
CHECK_C_COMPILER_FLAG("-Werror -D_FORTIFY_SOURCE=2" COMPATIBLE_FORTIFY_SOURCE)
IF (${COMPATIBLE_FORTIFY_SOURCE})
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 "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" AND NOT APPLE)
SET(SEC_COMP_FLAGS "${SEC_COMP_FLAGS} -Wa,--noexecstack")
ENDIF ()
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SEC_COMP_FLAGS}")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SEC_COMP_FLAGS}")
SET(SEC_LINK_FLAGS "")
IF (NOT APPLE)
SET(SEC_LINK_FLAGS "${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")
SET(COMP_FLAGS "${COMP_FLAGS} -Wno-unused-but-set-variable")
ENDIF ()
IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.9.9)
SET(COMP_FLAGS "${COMP_FLAGS} -Wno-format-truncation")
ENDIF ()
IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
SET(COMP_FLAGS "${COMP_FLAGS} -Wno-nonnull -Wno-deprecated-declarations")
ENDIF ()
# Minimal debug info with Clang
IF ("${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} ${LINKER_FLAGS}")
ENDIF ()
# Sanitizer support
SET(CLANG_SANITIZERS OFF CACHE BOOL "Clang's sanitizer support")
IF (CLANG_SANITIZERS AND
((UNIX AND "${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)
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