gcc/Makefile.in: fix parallel building failure

The gcc-ar.o, gcc-nm.o, gcc-ranlib.o and errors.o included
config.h which was a generated file. But no explicity rule
to clarify the dependency. There was potential building
failure while parallel make.

For gcc-ar.o, gcc-nm.o and gcc-ranlib.o, they were compiled from one C
source file gcc-ar.c, we add them to ALL_HOST_BACKEND_OBJS, so the
'$(ALL_HOST_OBJS) : | $(generated_files)' rule could work for these
objects.

For errors.o, it is part of gengtype, and the gengtype generator program
is special: Two versions are built. One is for the build machine, and one
is for the host. We refered what gengtype-parse.o did (which also is part
of gengtype).

[GCC #61899]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61899

Upstream-Status: Submitted [gcc-patches@gcc.gnu.org]

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
 gcc/Makefile.in | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 6475cba..56e50bb 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -1481,13 +1481,16 @@ OBJS-libcommon-target = $(common_out_object_file) prefix.o params.o \
 	opts.o opts-common.o options.o vec.o hooks.o common/common-targhooks.o \
 	hash-table.o file-find.o
 
+# Objects compiled from one C source file gcc-ar.c
+OBJS-gcc-ar = gcc-ar.o gcc-nm.o gcc-ranlib.o
+
 # This lists all host objects for the front ends.
 ALL_HOST_FRONTEND_OBJS = $(foreach v,$(CONFIG_LANGUAGES),$($(v)_OBJS))
 
 ALL_HOST_BACKEND_OBJS = $(GCC_OBJS) $(OBJS) $(OBJS-libcommon) \
   $(OBJS-libcommon-target) @TREEBROWSER@ main.o c-family/cppspec.o \
   $(COLLECT2_OBJS) $(EXTRA_GCC_OBJS) $(GCOV_OBJS) $(GCOV_DUMP_OBJS) \
-  lto-wrapper.o
+  lto-wrapper.o $(OBJS-gcc-ar)
 
 # This lists all host object files, whether they are included in this
 # compilation or not.
@@ -2437,6 +2440,8 @@ gengtype-parse.o: $(CONFIG_H)
 CFLAGS-build/gengtype-parse.o += -DGENERATOR_FILE
 build/gengtype-parse.o: $(BCONFIG_H)
 
+errors.o : $(CONFIG_H)
+
 gengtype-state.o build/gengtype-state.o: gengtype-state.c $(SYSTEM_H) \
   gengtype.h errors.h double-int.h version.h $(HASHTAB_H) $(OBSTACK_H) \
   $(XREGEX_H)
-- 
1.8.1.2