[Bug bootstrap/51479] New: Missing dependency on errors.o causes bootstrap failure

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51479

             Bug #: 51479
           Summary: Missing dependency on errors.o causes bootstrap
                    failure
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: hjl.to...@gmail.com


gcc/Makefile.in has

gengtype$(exeext) : gengtype.o gengtype-lex.o gengtype-parse.o \
              gengtype-state.o version.o errors.o $(LIBDEPS)
        +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
            $(filter-out ($LIBDEPS), $^) $(LIBS)

However, there is no errors.o dependency, which leads to random
parallel build failures.