cmake_modules/compilerchecks.cmake
author Wuzzy <Wuzzy2@mail.ru>
Fri, 09 Mar 2018 19:05:59 +0100
changeset 13145 5083fb0a2992
parent 10783 8e742c9ffdf8
child 15474 6e09555b25b4
permissions -rw-r--r--
A Classic Fairytale: Harden all missions against missing campaign variables in team file and assume default values This assumes the worst case in which the team file is missing all campaign variables except Progress. This has been successfully tested with all 10 missions and still generates a logical storyline. By default, the game assumes: - The cyborg's offer in mission 2 was refused - The traitor in mission 5 was killed As a consequence, missions 8 and 10 use the princessScene cut scene.


#TESTING TIME
include(CheckCCompilerFlag)
#when you need to check for a linker flag, just leave the argument of "check_c_compiler_flag" empty

# CMAKE_C{XX}_FLAGS is for compiler flags (c and c++)
# CMAKE_EXE_LINKER_FLAGS is for linker flags (also add them to pascal_flags and haskell_flags)
# CMAKE_SHARED_LIBRARY_<lang>_FLAGS same but for shared libraries

#TODO: should there be two different checks for C and CXX?
#TODO: can the various if(platform) be avoided in some way?


if(NOT (WIN32 OR (CMAKE_SYSTEM_NAME MATCHES BSD.OS) OR (CMAKE_SYSTEM_NAME MATCHES FreeBSD)))
    #stack protection, when found it needs to go in the linker flags too
    #it is disabled on win32 because it adds a dll and messes with linker
    #some bsd installations reported problems too
    #(see 822312 654424 on bugzilla.redhat.com)
    check_c_compiler_flag("-fstack-protector-all -fstack-protector" HAVE_STACKPROTECTOR)
    if(HAVE_STACKPROTECTOR)
        add_flag_append(CMAKE_C_FLAGS "-fstack-protector-all -fstack-protector")
        add_flag_append(CMAKE_CXX_FLAGS "-fstack-protector-all -fstack-protector")
    endif()
endif()



if(UNIX)
    #symbol visibility
    check_c_compiler_flag("-fvisibility=hidden" HAVE_VISIBILITY)
    if(HAVE_VISIBILITY)
        add_flag_append(CMAKE_C_FLAGS "-fvisibility=hidden")
        add_flag_append(CMAKE_CXX_FLAGS "-fvisibility=hidden")
    endif()

    #check for noexecstack on ELF, Gentoo security
    set(CMAKE_REQUIRED_FLAGS "-Wl,-znoexecstack")
    check_c_compiler_flag("" HAVE_NOEXECSTACK)
    if(HAVE_NOEXECSTACK)
        add_linker_flag("-znoexecstack")
    endif()

    #check for origin on ELF, BSD $ORIGIN support
    set(CMAKE_REQUIRED_FLAGS "-Wl,-zorigin")
    check_c_compiler_flag("" HAVE_ORIGIN)
    if(HAVE_ORIGIN)
        add_linker_flag("-zorigin")
    endif()

    #check for full relro on ELF, Debian security
    set(CMAKE_REQUIRED_FLAGS "-Wl,-zrelro,-znow")
    check_c_compiler_flag("" HAVE_RELROFULL)
    if(HAVE_RELROFULL)
        add_linker_flag("-zrelro")
        add_linker_flag("-znow")
    else()
        #if full relro is not available, try partial relro
        set(CMAKE_REQUIRED_FLAGS "-Wl,-zrelro")
        check_c_compiler_flag("" HAVE_RELROPARTIAL)
        if(HAVE_RELROPARTIAL)
            add_linker_flag("-zrelro")
        endif()
    endif()

    if(CMAKE_BUILD_TYPE MATCHES "RELEASE" OR CMAKE_BUILD_TYPE MATCHES "RELWITHDEBINFO")
        set(CMAKE_REQUIRED_FLAGS "-Wl,--as-needed")
        check_c_compiler_flag("" HAVE_ASNEEDED)
        if(HAVE_ASNEEDED)
            add_linker_flag("--as-needed")
        endif()
    endif()
else(UNIX)
    #check for ASLR on Windows Vista or later, requires binutils >= 2.20
    set(CMAKE_REQUIRED_FLAGS "-Wl,--nxcompat")
    check_c_compiler_flag("" HAVE_WINASLR)
    if(HAVE_WINASLR)
        add_linker_flag("--nxcompat")
    endif()

    #check for DEP on Windows XP SP2 or later, requires binutils >= 2.20
    set(CMAKE_REQUIRED_FLAGS "-Wl,--dynamicbase")
    check_c_compiler_flag("" HAVE_WINDEP)
    if(HAVE_WINDEP)
        add_linker_flag("--dynamicbase")
    endif()
endif(UNIX)


#always unset or these flags will be spread everywhere
unset(CMAKE_REQUIRED_FLAGS)