https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98633
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm. I see in libcody/Makefile.in
revision.stamp: $(addprefix $(srcdir)/,. $(SUBDIRS))
@revision=$$(git -C $(srcdir) rev-parse HEAD 2>/dev/null) ;\
if test -n "$$revision" ;\
then revision=git-$$revision ;\
if git -C $(srcdir) status --porcelain 2>/dev/null | grep -vq '^ '
;\
then revision+=M ;\
fi ;\
else revision=unknown ;\
fi ;\
echo $$revision > $@
and when this happened to me I was committing sth to the tree (uncommitted
changes) during the bootstrap. Not sure if the git rev somehow ends up
in fatal.o
