# Misc library-related options

 config CC_GCC_ENABLE_TARGET_OPTSPACE

     bool

     prompt "Optimize gcc libs for size"

     default y

     help

       Pass --enable-target-optspace to crossgcc's configure.

       This will compile crossgcc's libs with -Os.

 config CC_GCC_USE_GRAPHITE

     bool

     prompt "Enable GRAPHITE loop optimisations"

     default y

     depends on CC_GCC_HAS_GRAPHITE

     select CC_GCC_USE_PPL_CLOOG

     help

       Enable the GRAPHITE loop optimsations.

       This requires the PPL and CLooG companion libraries, and

       those will be automatically build for you.

       On some systems (eg. Cygwin), PPL and/or CLooG may not

       build properly (yet), so you'll have to say 'N' here.

 # The way LTO works is a bit twisted.

 # See: http://gcc.gnu.org/wiki/LinkTimeOptimization#Requirements

 # Basically:

 #   - if binutils has plugins: LTO is handled by ld/gold by loading

 #     the plugin when linking

 #   - if binutils does not have plugins: LTO is handled by collect2

 # In any case, LTO support does not depend on plugins, but takes

 # advantage of it

 # Also, only the 4.5 series needs libelf for LTO; 4.6 has dropped

 # the dependency.

 config CC_GCC_USE_LTO

     bool

     prompt "Enable LTO"

     default y

     depends on CC_GCC_HAS_LTO

     select CC_GCC_USE_LIBELF if CC_GCC_4_5

     help

       Enable the Link Time Optimisations.

       This will require the libelf companion library, and it

       wil be build automatically for you.

 config STATIC_TOOLCHAIN

     select CC_STATIC_LIBSTDCXX if CC_GCC_4_4_or_later

 config CC_STATIC_LIBSTDCXX

     bool

     prompt "Link libstdc++ statically into the gcc binary"

     default y

     depends on CC_GCC_4_4_or_later

     help

       Newer gcc versions use the PPL library which is C++ code.  Statically

       linking libstdc++ increases the likeliness that the gcc binary will

       run on machines other than the one which it was built on, without

       having to worry about distributing the matching version of libstdc++

       along with it.

 config CC_GCC_LIBMUDFLAP

     bool

     prompt "Compile libmudflap"

     default n

     help

       libmudflap is a pointer-use checking tool, which can detect

       various mis-usages of pointers in C and (to some extents) C++.

       You should say 'N' here, as libmduflap generates instrumented

       code (thus it is a bit bigger and a bit slower) and requires

       re-compilation and re-link, while it exists better run-time

       alternatives (eg. DUMA, dmalloc...) that need neither re-

       compilation nor re-link.

 config CC_GCC_LIBGOMP

     bool

     prompt "Compile libgomp"

     default n

     help

       libgomp is "the GNU implementation of the OpenMP Application Programming

       Interface (API) for multi-platform shared-memory parallel programming in

       C/C++ and Fortran". See:

         http://gcc.gnu.org/onlinedocs/libgomp/

       The default is 'N'. Say 'Y' if you need it, and report success/failure.

 config CC_GCC_LIBSSP

     bool

     prompt "Compile libssp"

     default n

     help

       libssp is the run-time Stack-Smashing Protection library.

       The default is 'N'. Say 'Y' if you need it, and report success/failure.

 #-----------------------------------------------------------------------------

 comment "Misc. obscure options."

 config CC_CXA_ATEXIT

     bool

     prompt "Use __cxa_atexit"

     default y

     depends on ! BARE_METAL

     help

       If you get the missing symbol "__cxa_atexit" when building C++ programs,

       you might want to try disabling this option.

 config CC_GCC_DISABLE_PCH

     bool

     prompt "Do not build PCH"

     default n

     help

       Say 'y' here to not use Pre-Compiled Headers in the resulting toolchain.

       at the expense of speed when compiling C++ code.

       For some configurations (most notably canadian?), PCH are broken, and

       need to be disabled. Please see:

         http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974

 config CC_GCC_SJLJ_EXCEPTIONS

     tristate

     prompt "Use sjlj for exceptions"

     depends on ! BARE_METAL

     default m

     help

       'sjlj' is short for setjmp/longjmp.

       On some architectures, stack unwinding during exception handling

       works perfectly well without using sjlj, while on some others,

       use of sjlj is required for proper stack unwinding.

        Option  | sjlj use           | Associated ./configure switch

       ---------+--------------------+--------------------------------

          Y     | forcibly used      | --enable-sjlj-exceptions

          M     | auto               | (none, ./configure decides)

          N     | forcibly not used  | --disable-sjlj-exceptions

       It should be safe to say 'M' or 'N'.

       It can happen that ./configure is wrong in some cases. Known

       case is for ARM big endian, where you should say 'N'.

 config CC_GCC_LDBL_128

     tristate

     prompt "Enable 128-bit long doubles"

     default m

     depends on CC_GCC_4_2_or_later

     help

       Saying 'Y' will force gcc to use 128-bit wide long doubles

       Saying 'N' will force gcc to use 64-bit wide long doubles

       Saying 'M' will let gcc choose (default is 128-bit for

                  glibc >= 2.4, 64-bit otherwise)

       If in doubt, keep the default, ie. 'M'.