cmake_modules/compilerchecks.cmake
author Wuzzy <Wuzzy2@mail.ru>
Thu, 03 Jan 2019 19:46:48 +0100
changeset 14514 5ac181cb2396
parent 10783 8e742c9ffdf8
child 15449 6e09555b25b4
permissions -rw-r--r--
Fix bee targeting fail across wrap world edge Previously, the bee always aimed for the light area, no matter where you actually put the target. It also got confused whenever it flew across the wrap world edge. How the bee works now: 1) The placed bee target is *not* recalculated when it was placed in the "gray" part of the wrap world edge. This allows for more fine-tuning. 1a) Place target in light area: bee aims for target light area 1b) Place target in gray area: bee aims for target, but flies to gray area first 2) Bee target is recalculated whenever bee passes the wrap world edge.
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#TESTING TIME
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include(CheckCCompilerFlag)
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#when you need to check for a linker flag, just leave the argument of "check_c_compiler_flag" empty
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# CMAKE_C{XX}_FLAGS is for compiler flags (c and c++)
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# CMAKE_EXE_LINKER_FLAGS is for linker flags (also add them to pascal_flags and haskell_flags)
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# CMAKE_SHARED_LIBRARY_<lang>_FLAGS same but for shared libraries
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#TODO: should there be two different checks for C and CXX?
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#TODO: can the various if(platform) be avoided in some way?
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if(NOT (WIN32 OR (CMAKE_SYSTEM_NAME MATCHES BSD.OS) OR (CMAKE_SYSTEM_NAME MATCHES FreeBSD)))
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    #stack protection, when found it needs to go in the linker flags too
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    #it is disabled on win32 because it adds a dll and messes with linker
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    #some bsd installations reported problems too
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    #(see 822312 654424 on bugzilla.redhat.com)
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    check_c_compiler_flag("-fstack-protector-all -fstack-protector" HAVE_STACKPROTECTOR)
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    if(HAVE_STACKPROTECTOR)
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        add_flag_append(CMAKE_C_FLAGS "-fstack-protector-all -fstack-protector")
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        add_flag_append(CMAKE_CXX_FLAGS "-fstack-protector-all -fstack-protector")
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    endif()
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endif()
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if(UNIX)
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    #symbol visibility
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    check_c_compiler_flag("-fvisibility=hidden" HAVE_VISIBILITY)
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    if(HAVE_VISIBILITY)
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        add_flag_append(CMAKE_C_FLAGS "-fvisibility=hidden")
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        add_flag_append(CMAKE_CXX_FLAGS "-fvisibility=hidden")
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    endif()
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    #check for noexecstack on ELF, Gentoo security
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    set(CMAKE_REQUIRED_FLAGS "-Wl,-znoexecstack")
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    check_c_compiler_flag("" HAVE_NOEXECSTACK)
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    if(HAVE_NOEXECSTACK)
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        add_linker_flag("-znoexecstack")
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    endif()
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    #check for origin on ELF, BSD $ORIGIN support
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    set(CMAKE_REQUIRED_FLAGS "-Wl,-zorigin")
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    check_c_compiler_flag("" HAVE_ORIGIN)
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    if(HAVE_ORIGIN)
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        add_linker_flag("-zorigin")
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    endif()
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    #check for full relro on ELF, Debian security
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    set(CMAKE_REQUIRED_FLAGS "-Wl,-zrelro,-znow")
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    check_c_compiler_flag("" HAVE_RELROFULL)
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    if(HAVE_RELROFULL)
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        add_linker_flag("-zrelro")
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        add_linker_flag("-znow")
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    else()
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        #if full relro is not available, try partial relro
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        set(CMAKE_REQUIRED_FLAGS "-Wl,-zrelro")
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        check_c_compiler_flag("" HAVE_RELROPARTIAL)
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        if(HAVE_RELROPARTIAL)
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            add_linker_flag("-zrelro")
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        endif()
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    endif()
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    if(CMAKE_BUILD_TYPE MATCHES "RELEASE" OR CMAKE_BUILD_TYPE MATCHES "RELWITHDEBINFO")
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        set(CMAKE_REQUIRED_FLAGS "-Wl,--as-needed")
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        check_c_compiler_flag("" HAVE_ASNEEDED)
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        if(HAVE_ASNEEDED)
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            add_linker_flag("--as-needed")
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        endif()
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    endif()
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else(UNIX)
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    #check for ASLR on Windows Vista or later, requires binutils >= 2.20
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    set(CMAKE_REQUIRED_FLAGS "-Wl,--nxcompat")
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    check_c_compiler_flag("" HAVE_WINASLR)
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    if(HAVE_WINASLR)
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        add_linker_flag("--nxcompat")
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    endif()
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    #check for DEP on Windows XP SP2 or later, requires binutils >= 2.20
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    set(CMAKE_REQUIRED_FLAGS "-Wl,--dynamicbase")
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    check_c_compiler_flag("" HAVE_WINDEP)
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    if(HAVE_WINDEP)
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        add_linker_flag("--dynamicbase")
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    endif()
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endif(UNIX)
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#always unset or these flags will be spread everywhere
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unset(CMAKE_REQUIRED_FLAGS)
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