cmake_modules/compilerchecks.cmake
author Periklis Ntanasis <pntanasis@gmail.com>
Fri, 05 Jul 2013 04:32:39 +0300
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changeset 9312 f6bec1cfbfbd
parent 9298 2d88d01bad07
child 9307 a0fef7134ade
permissions -rw-r--r--
progress on the main moon mission
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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
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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 AND ((NOT WIN32) OR (CMAKE_SYSTEM_NAME MATCHES BSD.OS)))
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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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    add_flag_append(CMAKE_EXE_LINKER_FLAGS "-fstack-protector-all -fstack-protector")
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    add_flag_append(CMAKE_SHARED_LIBRARY_C_FLAGS "-fstack-protector-all -fstack-protector")
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    add_flag_append(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
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check_c_compiler_flag("-fvisibility=hidden" HAVE_VISIBILITY)
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if(HAVE_VISIBILITY AND (NOT WIN32))
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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,-z,noexecstack")
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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 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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#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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#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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    add_linker_flag("--as-needed")
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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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