[Bug other/80803] libgo appears to be miscompiled on powerpc64le since r247923

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80803

--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Looks like this arises from this code in libgo/Makefile.in:

          if $(SHELL) $(srcdir)/testsuite/gotest --goarch=$(GOARCH)
--goos=$(GO\
OS) --basedir=$(srcdir) --srcdir=$(srcdir)/go/$(@D) --pkgpath="$(@D)"
--pkgfile\
s="$$files" $(GOTESTFLAGS) >>$@-testlog 2>&1; then \
            echo "PASS: $(@D)" >> $@-testlog; \
            echo "PASS: $(@D)"; \
            echo "PASS: $(@D)" > $@-testsum; \
          else \
            echo "FAIL: $(@D)" >> $@-testlog; \
            cat $@-testlog; \
            echo "FAIL: $(@D)" > $@-testsum; \
            exit 1; \
          fi; \

gotest must be spewing garbage into net/check-testlog when $@=net/check, so
presumably gotest (or something it invokes) is miscompiled.  It must return
failure to invoke "cat $@-testlog;".