Backport from mainline r189840 and r187586:

    Backport from mainline r189840 and r187586:

        2012-07-25 Sergey Melnikov <sergey.melnikov@intel.com>

        * config/i386/i386.md (stack_protect_set): Disable the pattern
        for Android since Android libc (bionic) does not provide random
        value for stack protection guard at gs:0x14. Guard value
        will be provided from external symbol (default implementation).
        (stack_protect_set_<mode>): Likewise.
        (stack_protect_test): Likewise.
        (stack_protect_test_<mode>): Likewise.
        * gcc/defaults.h: Define macro TARGET_HAS_BIONIC to 0 - target does
        not have Bionic by default
        * config/linux.h: Redefine macro TARGET_HAS_BIONIC to (OPTION_BIONIC)
        Macro OPTION_BIONIC is defined in this file and provides Bionic
        accessibility status

        2012-05-16  Igor Zamyatin  <igor.zamyatin@intel.com>

        * configure.ac: Stack protector enabling for Android targets.
        * configure: Regenerate.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_7-branch@190383 138bc75d-0d04-0410-961f-82ee72b054a4