Feel free to revert this one, was just screwing around with stuff from before. I kinda like it and figured committing it was the easiest way for you to look at it. http://m8y.org/hw/perlin.png
#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?
#TODO: can the various if(platform) be avoided in some way?
if(NOT (WIN32 OR (CMAKE_SYSTEM_NAME MATCHES BSD.OS) OR (CMAKE_SYSTEM_NAME MATCHES FreeBSD)))
#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
#some bsd installations reported problems too
#(see 822312 654424 on bugzilla.redhat.com)
check_c_compiler_flag("-fstack-protector-all -fstack-protector" HAVE_STACKPROTECTOR)
if(HAVE_STACKPROTECTOR)
add_flag_append(CMAKE_C_FLAGS "-fstack-protector-all -fstack-protector")
add_flag_append(CMAKE_CXX_FLAGS "-fstack-protector-all -fstack-protector")
endif()
endif()
if(UNIX)
#symbol visibility
check_c_compiler_flag("-fvisibility=hidden" HAVE_VISIBILITY)
if(HAVE_VISIBILITY)
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,-znoexecstack")
check_c_compiler_flag("" HAVE_NOEXECSTACK)
if(HAVE_NOEXECSTACK)
add_linker_flag("-znoexecstack")
endif()
#check for origin on ELF, BSD $ORIGIN support
set(CMAKE_REQUIRED_FLAGS "-Wl,-zorigin")
check_c_compiler_flag("" HAVE_ORIGIN)
if(HAVE_ORIGIN)
add_linker_flag("-zorigin")
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()
if(CMAKE_BUILD_TYPE MATCHES "RELEASE")
set(CMAKE_REQUIRED_FLAGS "-Wl,--as-needed")
check_c_compiler_flag("" HAVE_ASNEEDED)
if(HAVE_ASNEEDED)
add_linker_flag("--as-needed")
endif()
endif()
else(UNIX)
#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()
endif(UNIX)
#always unset or these flags will be spread everywhere
unset(CMAKE_REQUIRED_FLAGS)