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Subject: [Bug bootstrap/102675] [12 regression] Bootstrap fails in
 libsanitizer: 'MD5_DIGEST_STRING_LENGTH' was not declared in this scope
Date: Sun, 10 Oct 2021 21:22:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102675

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Gerald Pfeifer from comment #2)
> (In reply to H.J. Lu from comment #1)
> > That file is FreeBSD specific.  Can you use a local patch to force
> > /usr/include/md5.h, like
> >=20
> > #include_next <md5.h>
>=20
> I tried replacing #include <md5.h> by #include_next <md5.h>; that did
> not lead to any change.
>=20
> Using #include "/usr/include/md5.h" restored bootstrap.
>=20
> This confirms my hypothesis that it's GCC's md5.h being picked up that
> is the issue for this regression.

Does this file use any GCC specific header files?  If not, you can
filter out GCC specific -Ixxx from CXX and CXXFLAGS for this file.
Or can you prepend -Isystem-headr-directory to CXXFLAGS for this file?=