[patch] refine -I flags for VxWorks libgcc

[Olivier Hainque <hainque at adacore dot com>]

Hello,

This patch arranges to always have <toplevel-build-dir>/gcc/include in the
-I flags for libgcc on VxWorks. This directory contains user accessible header
files provided by gcc so is legitimate and needed in many cases.

This is implicitly achieved with -B when building a regular cross
compiler, but there's no such -B when cross compiling libraries as
part of a canadian build.

We have been using this for months on gcc-6 and gcc-7 ports to a large
variety of VxWorks 6 and 7 configurations, and Rasmus reported that it
is fixing the exact same issue for them
(https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00120.html)

Committing to mainline,

Olivier


2018-06-07  Olivier Hainque  <hainque@adacore.com>

        * libgcc/config/t-vxworks (LIBGCC_INCLUDES):
        Add -I$(MULTIBUILDTOP)../../gcc/include.
        * libgcc/config/t-vxworks7: Likewise. Reformat a bit to
        match the t-vxworks layout.

Attachment: 0002-Refine-I-flags-for-VxWorks-libgcc.patch
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