cmake_modules/compilerchecks.cmake
author koda
Wed, 12 Jun 2013 19:30:11 +0200
changeset 9217 992b7ef2eba3
parent 9211 6235925d0fa1
child 9219 0a4b6bb69f99
permissions -rw-r--r--
apply linker flags to all relevant targets
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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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#stack protection, when found it needs to go in the linker flags too (-lssp is added)
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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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    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstack-protector-all -fstack-protector")
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    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector-all -fstack-protector")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fstack-protector-all -fstack-protector")
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    set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} -fstack-protector-all -fstack-protector")
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    set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} -fstack-protector-all -fstack-protector")
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endif()
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#symbol visibility, not supported on Windows (so we error out to avoid spam)
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check_c_compiler_flag("-fvisibility=hidden -Werror" HAVE_VISIBILITY)
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if(HAVE_VISIBILITY)
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    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden")
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    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
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endif()
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#check for noexecstack on ELF, Gentoo security
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set(CMAKE_REQUIRED_FLAGS "-Wl,-z,noexecstack")
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check_c_compiler_flag("" HAVE_NOEXECSTACK)
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if(HAVE_NOEXECSTACK)
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    list(APPEND pascal_flags "-k-z" "-knoexecstack")
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    list(APPEND haskell_flags "-optl" "${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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endif()
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#check for full relro on ELF, Debian security
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set(CMAKE_REQUIRED_FLAGS "-Wl,-z,relro,-z,now")
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check_c_compiler_flag("" HAVE_RELROFULL)
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if(HAVE_RELROFULL)
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    list(APPEND pascal_flags "-k-z" "-krelro" "-k-z" "-know")
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    list(APPEND haskell_flags "-optl" "${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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else()
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    #if full relro is not available, try partial relro
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    set(CMAKE_REQUIRED_FLAGS "-Wl,-z,relro")
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    check_c_compiler_flag("" HAVE_RELROPARTIAL)
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    if(HAVE_RELROPARTIAL)
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        list(APPEND pascal_flags "-k-z" "-krelro")
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        list(APPEND haskell_flags "-optl" "${CMAKE_REQUIRED_FLAGS}")
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        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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        set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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        set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    endif()
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endif()
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#check for ASLR on Windows Vista or later, requires binutils >= 2.20
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set(CMAKE_REQUIRED_FLAGS "-Wl,--nxcompat")
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check_c_compiler_flag("" HAVE_WINASLR)
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if(HAVE_WINASLR)
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    list(APPEND pascal_flags "-k--nxcompat")
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    list(APPEND haskell_flags "-optl" "${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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endif()
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#check for DEP on Windows XP SP2 or later, requires binutils >= 2.20
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set(CMAKE_REQUIRED_FLAGS "-Wl,--dynamicbase")
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check_c_compiler_flag("" HAVE_WINDEP)
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if(HAVE_WINDEP)
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    list(APPEND pascal_flags "-k--dynamicbase")
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    list(APPEND haskell_flags "-optl" "${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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endif()
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#this is actually an optimisation
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set(CMAKE_REQUIRED_FLAGS "-Wl,--as-needed")
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check_c_compiler_flag("" HAVE_ASNEEDED)
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if(HAVE_ASNEEDED)
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    list(APPEND pascal_flags "-k--as-needed")
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    list(APPEND haskell_flags "-optl" "${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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endif()
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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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