https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126875
Bug ID: 126875
Summary: [17 regression] Parallel make compare breaks bootstrap
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: iains at gcc dot gnu.org, ktkachov at gcc dot gnu.org
Target Milestone: ---
Target: *-apple-darwin17, *-*-solaris2.11
The new parallel make compare breaks bootstrap on Mac OS X 10.13 (Darwin 17):
Comparing stages 2 and 3
compare.42895.mk:5: *** missing separator. Stop.
make[2]: *** [Makefile:30524: compare] Error 2
When one keeps the generated compare.<id>.mk, one finds that it starts with
.PHONY: all FORCE
FORCE:
compare/%: FORCE ; @f1=$$r/stage2-$*; f2=$$r/stage3-$*; /usr/local/bin/bash
/vol/gcc/src/hg/master/local-slow/contrib/compare-debug $$f1 $$f2
> /dev/null 2>&1; st=$$?; if test $$st -eq 1; then case $* in
gcc/cc*-checksum.o | gcc/ada/*tools/* | gcc/m2/gm2-compiler-boot/M2Version* |
gcc/m2/gm2-compiler-boot/SYSTEM* | gcc/m2/gm2version* | gcc/cobol/parse.o) echo
warning: $* differs ;; *) echo $* differs >> "$$bad_compare.$$$$" ;; esac; elif
test $$st -ne 0; then echo "$* compare: error status $$st" >>
"$$bad_compare.$$$$"; fi
I.e. a newline before '>'.
The issue can be reproduces as easily as
$ echo -n '$$' | sed -e 's,/\$,$$,g' | cat -e
$$$
i.e. sed adds a trailing newline. GNU sed in comparison does not:
$ echo -n '$$' | sed -e 's,/\$,$$,g' | cat -e
$$
Things would be even worse with Solaris /usr/bin/sed which produces no output
at all.
I haven't yet checked if the autoconf docs suggest an alternative/solution.
