Arrange to inhibit the effects of CPLUSPLUS_CPP_SPEC in gnu-user.h, which #defines _GNU_SOURCE, which is invalid for VxWorks (possibly not providing ::mkstemp, for example).
This has been used in gcc-9 based production compilers for several targets
for a year, passed a build & test sequence for powerpc-vxworks7 with gcc-10
and a sanity check build with a recent mainline.
Olivier
2020-09-24 Olivier Hainque <hain...@adacore.com>
* config/vxworks.h: #undef CPLUSPLUS_CPP_SPEC.
0005-Fallback-to-default-CPP-spec-for-C-on-VxWorks.diff
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