PATCH: PR bootstrap/51479: Missing dependency on errors.o causes bootstrap failure

[H.J. Lu]

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.  This patch adds errors.o dependency.  OK
for trunk and release branches?

Thanks.

H.J.
---
2011-12-08  H.J. Lu  <hongjiu...@intel.com>

        PR bootstrap/51479
        * Makefile.in (errors.o): New.

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index ae4f4da..83f70fa 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -3947,6 +3947,8 @@ build/genautomata$(build_exeext) : BUILD_LIBS += -lm
 build/gengtype$(build_exeext) : build/gengtype-lex.o build/gengtype-parse.o \
               build/gengtype-state.o build/version.o build/errors.o
 
+errors.o : errors.c $(CONFIG_H) $(SYSTEM_H) errors.h
+
 gengtype$(exeext) : gengtype.o gengtype-lex.o gengtype-parse.o \
               gengtype-state.o version.o errors.o $(LIBDEPS)
        +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \