cmake_modules/compilerchecks.cmake
author unc0rr
Sat, 15 Jun 2013 23:44:37 +0400
branchwebgl
changeset 9164 d923ba9d1145
parent 9159 3e9d4bbc4053
child 9165 7b0d5388abc4
permissions -rw-r--r--
Allow building with modern 'base' package
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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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#TODO: should there be two different checks for C and CXX?
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#stack protection
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check_c_compiler_flag("-fstack-protector" HAVE_STACKPROTECTOR)
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if(HAVE_STACKPROTECTOR)
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    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstack-protector")
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    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector")
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endif()
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#symbol visibility
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check_c_compiler_flag("-fvisibility=hidden" HAVE_VISIBILITYH)
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if(HAVE_VISIBILITYH)
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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" "-z" "-optl" "noexecstack")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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endif()
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#check for full relro on ELF, Debian security
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set(CMAKE_REQUIRED_FLAGS "-Wl,-z,relro,-z,now")
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check_c_compiler_flag("" HAVE_RELROFULL)
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if(HAVE_RELROFULL)
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    list(APPEND pascal_flags "-k-z" "-krelro" "-k-z" "-know")
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    list(APPEND haskell_flags "-optl" "-z" "-optl" "relro" "-optl" "-z" "-optl" "now")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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else()
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    #if full relro is not available, try partial relro
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    set(CMAKE_REQUIRED_FLAGS "-Wl,-z,relro")
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    check_c_compiler_flag("" HAVE_RELROPARTIAL)
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    if(HAVE_RELROPARTIAL)
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        list(APPEND pascal_flags "-k-z" "-krelro")
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        list(APPEND haskell_flags "-optl" "-z" "-optl" "relro")
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        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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    endif()
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endif()
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#check for ASLR on Windows Vista or later, requires binutils >= 2.20
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set(CMAKE_REQUIRED_FLAGS "-Wl,--nxcompat")
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check_c_compiler_flag("" HAVE_WINASLR)
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if(HAVE_WINASLR)
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    list(APPEND pascal_flags "-k--nxcompat")
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    list(APPEND haskell_flags "-optl" "--nxcompat")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_REQUIRED_FLAGS}")
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endif()
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#check for DEP on Windows XP SP2 or later, requires binutils >= 2.20
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set(CMAKE_REQUIRED_FLAGS "-Wl,--dynamicbase")
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check_c_compiler_flag("" HAVE_WINDEP)
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if(HAVE_WINDEP)
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    list(APPEND pascal_flags "-k--dynamicbase")
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    list(APPEND haskell_flags "-optl" "--dynamicbase")
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    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_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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