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# Platform specific compilation flags
if(MSVC)
add_definitions(-D_SCL_SECURE_NO_WARNINGS)
add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
string(REPLACE "/Zm1000" " " CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
# /GF - String pooling
# /MP - Parallel build
set(CMAKE_C_FLAGS "/GF /MP /nologo ${CMAKE_C_FLAGS}")
# /Gd - explicitly set cdecl calling convention
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Gd")
if(NOT (MSVC_VERSION LESS 1900))
# /guard:cf - Enable Control Flow Guard
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /guard:cf")
endif()
if(STATIC_CRT)
set(CRT_FLAG_DEBUG "/MTd")
set(CRT_FLAG_RELEASE "/MT")
else()
set(CRT_FLAG_DEBUG "/MDd")
set(CRT_FLAG_RELEASE "/MD")
endif()
if(WIN32_LEAKCHECK)
set(GIT_WIN32_LEAKCHECK 1)
set(CRT_FLAG_DEBUG "${CRT_FLAG_DEBUG}")
set(CMAKE_C_STANDARD_LIBRARIES "${CMAKE_C_STANDARD_LIBRARIES} Dbghelp.lib")
endif()
# /Zi - Create debugging information
# /Od - Disable optimization
# /D_DEBUG - #define _DEBUG
# /MTd - Statically link the multithreaded debug version of the CRT
# /MDd - Dynamically link the multithreaded debug version of the CRT
# /RTC1 - Run time checks
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /Zi /Od /D_DEBUG /RTC1 ${CRT_FLAG_DEBUG}")
# /DNDEBUG - Disables asserts
# /MT - Statically link the multithreaded release version of the CRT
# /MD - Dynamically link the multithreaded release version of the CRT
# /O2 - Optimize for speed
# /Oy - Enable frame pointer omission (FPO) (otherwise CMake will automatically turn it off)
# /GL - Link time code generation (whole program optimization)
# /Gy - Function-level linking
set(CMAKE_C_FLAGS_RELEASE "/DNDEBUG /O2 /Oy /GL /Gy ${CRT_FLAG_RELEASE}")
# /Oy- - Disable frame pointer omission (FPO)
set(CMAKE_C_FLAGS_RELWITHDEBINFO "/DNDEBUG /Zi /O2 /Oy- /GL /Gy ${CRT_FLAG_RELEASE}")
# /O1 - Optimize for size
set(CMAKE_C_FLAGS_MINSIZEREL "/DNDEBUG /O1 /Oy /GL /Gy ${CRT_FLAG_RELEASE}")
# /IGNORE:4221 - Ignore empty compilation units
set(CMAKE_STATIC_LINKER_FLAGS "/IGNORE:4221")
# /DYNAMICBASE - Address space load randomization (ASLR)
# /NXCOMPAT - Data execution prevention (DEP)
# /LARGEADDRESSAWARE - >2GB user address space on x86
# /VERSION - Embed version information in PE header
set(CMAKE_EXE_LINKER_FLAGS "/DYNAMICBASE /NXCOMPAT /LARGEADDRESSAWARE /VERSION:${libgit2_VERSION_MAJOR}.${libgit2_VERSION_MINOR}")
if(NOT (MSVC_VERSION LESS 1900))
# /GUARD:CF - Enable Control Flow Guard
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /GUARD:CF")
endif()
# /DEBUG - Create a PDB
# /LTCG - Link time code generation (whole program optimization)
# /OPT:REF /OPT:ICF - Fold out duplicate code at link step
# /INCREMENTAL:NO - Required to use /LTCG
# /DEBUGTYPE:cv,fixup - Additional data embedded in the PDB (requires /INCREMENTAL:NO, so not on for Debug)
set(CMAKE_EXE_LINKER_FLAGS_DEBUG "/DEBUG")
set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO")
set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "/DEBUG /RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO /DEBUGTYPE:cv,fixup")
set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "/RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO")
# Same linker settings for DLL as EXE
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG}")
set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE}")
set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
set(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL}")
else()
if(ENABLE_REPRODUCIBLE_BUILDS)
set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
endif()
if(NOT BUILD_SHARED_LIBS AND LINK_WITH_STATIC_LIBRARIES)
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
endif()
set(CMAKE_C_FLAGS "-D_GNU_SOURCE ${CMAKE_C_FLAGS}")
enable_warnings(all)
enable_warnings(extra)
if(CMAKE_SYSTEM_NAME MATCHES "(Solaris|SunOS)")
set(CMAKE_C_FLAGS "-D_POSIX_C_SOURCE=200112L -D__EXTENSIONS__ -D_POSIX_PTHREAD_SEMANTICS ${CMAKE_C_FLAGS}")
endif()
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_DEBUG -O0")
if(MINGW OR MSYS) # MinGW and MSYS always do PIC and complain if we tell them to
string(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
elseif(BUILD_SHARED_LIBS)
add_c_flag_IF_SUPPORTED(-fvisibility=hidden)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
endif()
if(MINGW)
# MinGW >= 3.14 uses the C99-style stdio functions
# automatically, but forks like mingw-w64 still want
# us to define this in order to use them
add_definitions(-D__USE_MINGW_ANSI_STDIO=1)
endif()
enable_warnings(documentation)
disable_warnings(documentation-deprecated-sync)
disable_warnings(missing-field-initializers)
enable_warnings(missing-declarations)
enable_warnings(strict-aliasing)
enable_warnings(strict-prototypes)
enable_warnings(declaration-after-statement)
enable_warnings(shift-count-overflow)
enable_warnings(unused-const-variable)
enable_warnings(unused-function)
enable_warnings(int-conversion)
enable_warnings(c11-extensions)
enable_warnings(c99-c11-compat)
# MinGW uses gcc, which expects POSIX formatting for printf, but
# uses the Windows C library, which uses its own format specifiers.
# Disable format specifier warnings.
if(MINGW)
disable_warnings(format)
disable_warnings(format-security)
else()
enable_warnings(format)
enable_warnings(format-security)
endif()
endif()
# Ensure that MinGW provides the correct header files.
if(WIN32 AND NOT CYGWIN)
add_definitions(-DWIN32 -D_WIN32_WINNT=0x0600)
endif()
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