CVS commit: [netbsd-8] src

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Sun Apr  1 09:00:44 UTC 2018

Modified Files:
        src/external/gpl3/gcc/dist/gcc/config/i386 [netbsd-8]: constraints.md
            i386-opts.h i386-protos.h i386.c i386.h i386.md i386.opt
            predicates.md
        src/external/gpl3/gcc/dist/gcc/doc [netbsd-8]: extend.texi invoke.texi
        src/tools/gcc [netbsd-8]: gcc-version.mk

Log Message:
Pull up following revision(s) (requested by mrg in ticket #682):

        tools/gcc/gcc-version.mk: revision 1.10 (via patch)
        external/gpl3/gcc.old/dist/gcc/config/i386/i386.c: revision 1.10
        external/gpl3/gcc.old/dist/gcc/config/i386/i386-protos.h: revision 1.6
        external/gpl3/gcc.old/dist/gcc/config/i386/constraints.md: revision 1.6
        external/gpl3/gcc.old/dist/gcc/doc/invoke.texi: revision 1.7
        external/gpl3/gcc.old/dist/gcc/config/i386/i386.md: revision 1.7
        external/gpl3/gcc.old/dist/gcc/doc/extend.texi: revision 1.7
        external/gpl3/gcc.old/dist/gcc/config/i386/i386-opts.h: revision 1.4
        external/gpl3/gcc.old/dist/gcc/config/i386/predicates.md: revision 1.6
        external/gpl3/gcc.old/dist/gcc/config/i386/i386.h: revision 1.7
        external/gpl3/gcc.old/dist/gcc/config/i386/i386.opt: revision 1.7
        (with external/gpl3/gcc.old/ -> external/gpl3/gcc/)

add the spectre mitigation options for x86:

  -mindirect-branch=<choice>
  -mfunction-return=<choice>
  -mindirect-branch-register

the values for 'choice' are "keep" (default, existing behaviour),
"thunk", "thunk-inline", and "thunk-extern".

as taken from the Ubuntu port of these changes in their
ubuntu:gcc-5_5.5.0-8ubuntu1.diff.  i've also included the doc
updates that are missing from ubuntu from gcc itself.
i've tested both i386 and amd64 fairly heavily with these options
enabled in both kernels and userland, atf runs and hundreds of
package builds.

bump the NetBSD GCC version.  both GCC 5 and 6 got x86 spectre
mitigation code, and both are now "nb2 20180327".


To generate a diff of this commit:
cvs rdiff -u -r1.1.1.5 -r1.1.1.5.8.1 \
    src/external/gpl3/gcc/dist/gcc/config/i386/constraints.md
cvs rdiff -u -r1.1.1.2 -r1.1.1.2.8.1 \
    src/external/gpl3/gcc/dist/gcc/config/i386/i386-opts.h
cvs rdiff -u -r1.1.1.4 -r1.1.1.4.8.1 \
    src/external/gpl3/gcc/dist/gcc/config/i386/i386-protos.h \
    src/external/gpl3/gcc/dist/gcc/config/i386/predicates.md
cvs rdiff -u -r1.12.8.2 -r1.12.8.3 \
    src/external/gpl3/gcc/dist/gcc/config/i386/i386.c
cvs rdiff -u -r1.5.8.1 -r1.5.8.2 \
    src/external/gpl3/gcc/dist/gcc/config/i386/i386.h
cvs rdiff -u -r1.1.1.8.8.1 -r1.1.1.8.8.2 \
    src/external/gpl3/gcc/dist/gcc/config/i386/i386.md
cvs rdiff -u -r1.1.1.3.8.1 -r1.1.1.3.8.2 \
    src/external/gpl3/gcc/dist/gcc/config/i386/i386.opt
cvs rdiff -u -r1.1.1.7.8.1 -r1.1.1.7.8.2 \
    src/external/gpl3/gcc/dist/gcc/doc/extend.texi
cvs rdiff -u -r1.11.8.1 -r1.11.8.2 \
    src/external/gpl3/gcc/dist/gcc/doc/invoke.texi
cvs rdiff -u -r1.7 -r1.7.4.1 src/tools/gcc/gcc-version.mk

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.