cmake_modules/compilerchecks.cmake
author Wuzzy <Wuzzy2@mail.ru>
Tue, 02 Apr 2019 01:03:39 +0200
changeset 14740 7b2bd37d7503
parent 10783 8e742c9ffdf8
child 15449 6e09555b25b4
permissions -rw-r--r--
Fix inconsistencies in guest nick name generation When the setting net/nick is empty, HW generates a guest name. But there were several problems: - Team name did not match guest name - Random guest number was re-rolled multiple times, causing inconsistencies - Guest number was often too large (now capped at 99999)
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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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