[patch 4/7] Update the libgcc support for VxWorks AE/653

[Olivier Hainque <hainque at adacore dot com>]

Hello,

This change first fixes a glitch in the VxWorks AE/653 configuration
settings, missing a Makefile fragment to pass the expected compilation
flags when building libgcc.

It also adds a t-gthr-vxworksae fragment for the
gthreads support, specialized from other variants as we
we haven't implemented the cxx0x part for 653 yet.

We have been using this with gcc-8 based toolchains for AE
for about a year now. I have verified that a few gcc-9 based
ports for regular VxWorks still operate properly with this,
and I checked that I could build a powerpc-vxworks6 toolchain
with this patch on top of mainline sources.

Olivier

2019-11-12  Olivier Hainque  <hainque@adacore.com>

        libgcc/

        * config/t-gthr-vxworksae: New file, add all the gthr-vxworks
        sources except the cxx0x support to LIB2ADDEH.  We don't support
        cxx0x on AE/653.
        * config/t-vxworksae: New file.
        * config.host: Handle *-*-vxworksae: Add the two aforementioned
        Makefile fragment files at their expected position in the tmake_file
        list, in accordance with what is done for other VxWorks variants.

Attachment: 0004-Update-the-libgcc-support-for-VxWorks-AE-653.patch
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