+
−
+
−#TESTING TIME
+
−include(CheckCCompilerFlag)
+
−#when you need to check for a linker flag, just leave the argument of "check_c_compiler_flag" empty
+
−
+
−# CMAKE_C{XX}_FLAGS is for compiler flags (c and c++)
+
−# CMAKE_EXE_LINKER_FLAGS is for linker flags (also add them to pascal_flags and haskell_flags)
+
−# CMAKE_SHARED_LIBRARY_<lang>_FLAGS same but for shared libraries
+
−
+
−#TODO: should there be two different checks for C and CXX?
+
−
+
−#stack protection, when found it needs to go in the linker flags too
+
−#it is disabled on win32 because it adds a dll and messes with linker
+
−#(see 822312 654424 on bugzilla.redhat.com)
+
−check_c_compiler_flag("-fstack-protector-all -fstack-protector" HAVE_STACKPROTECTOR)
+
−if(HAVE_STACKPROTECTOR AND (NOT WIN32))
+
−    add_flag_append(CMAKE_C_FLAGS "-fstack-protector-all -fstack-protector")
+
−    add_flag_append(CMAKE_CXX_FLAGS "-fstack-protector-all -fstack-protector")
+
−    add_flag_append(CMAKE_EXE_LINKER_FLAGS "-fstack-protector-all -fstack-protector")
+
−    add_flag_append(CMAKE_SHARED_LIBRARY_C_FLAGS "-fstack-protector-all -fstack-protector")
+
−    add_flag_append(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-fstack-protector-all -fstack-protector")
+
−endif()
+
−
+
−#symbol visibility, not supported on Windows
+
−check_c_compiler_flag("-fvisibility=hidden" HAVE_VISIBILITY)
+
−if(HAVE_VISIBILITY AND (NOT WIN32))
+
−    add_flag_append(CMAKE_C_FLAGS "-fvisibility=hidden")
+
−    add_flag_append(CMAKE_CXX_FLAGS "-fvisibility=hidden")
+
−endif()
+
−
+
−
+
−#check for noexecstack on ELF, Gentoo security
+
−set(CMAKE_REQUIRED_FLAGS "-Wl,-z,noexecstack")
+
−check_c_compiler_flag("" HAVE_NOEXECSTACK)
+
−if(HAVE_NOEXECSTACK)
+
−    add_linker_flag("-znoexecstack")
+
−endif()
+
−
+
−#check for full relro on ELF, Debian security
+
−set(CMAKE_REQUIRED_FLAGS "-Wl,-zrelro,-znow")
+
−check_c_compiler_flag("" HAVE_RELROFULL)
+
−if(HAVE_RELROFULL)
+
−    add_linker_flag("-zrelro")
+
−    add_linker_flag("-znow")
+
−else()
+
−    #if full relro is not available, try partial relro
+
−    set(CMAKE_REQUIRED_FLAGS "-Wl,-zrelro")
+
−    check_c_compiler_flag("" HAVE_RELROPARTIAL)
+
−    if(HAVE_RELROPARTIAL)
+
−        add_linker_flag("-zrelro")
+
−    endif()
+
−endif()
+
−
+
−#check for ASLR on Windows Vista or later, requires binutils >= 2.20
+
−set(CMAKE_REQUIRED_FLAGS "-Wl,--nxcompat")
+
−check_c_compiler_flag("" HAVE_WINASLR)
+
−if(HAVE_WINASLR)
+
−    add_linker_flag("--nxcompat")
+
−endif()
+
−
+
−#check for DEP on Windows XP SP2 or later, requires binutils >= 2.20
+
−set(CMAKE_REQUIRED_FLAGS "-Wl,--dynamicbase")
+
−check_c_compiler_flag("" HAVE_WINDEP)
+
−if(HAVE_WINDEP)
+
−    add_linker_flag("--dynamicbase")
+
−endif()
+
−
+
−#this is actually an optimisation
+
−set(CMAKE_REQUIRED_FLAGS "-Wl,--as-needed")
+
−check_c_compiler_flag("" HAVE_ASNEEDED)
+
−if(HAVE_ASNEEDED)
+
−    add_linker_flag("--as-needed")
+
−endif()
+
−
+
−#always unset or these flags will be spread everywhere
+
−unset(CMAKE_REQUIRED_FLAGS)
+
−