[backport gcc-4.8/trunk r193691 <mikpe@it.uu.se>]

Date: Tue, 20 Nov 2012 16:35:45 +0000
Subject: [RFC] Parallel build broken on trunk.
From: Marcus Shawcroft <marcus dot shawcroft at gmail dot com>
List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>

Folks, Parallel builds contain a race due to a missing dependency
between gengtype-lex.o and $(BCONFIG_H).

This was introduced by the commit:

http://gcc.gnu.org/ml/gcc-patches/2010-11/msg00926.html

.. which injects an include of bconfig.h into the top of
gengtype-lex.c but does not make both of the objects built from that
file dependent on bconfig.h

There is a simple fix, below, but I'm concerned that this is just
papering over the cracks, is it really correct that both the build and
host machine variants include the same config file?

Cheers
/Marcus

gcc/

2012-11-21  Marcus Shawcroft  <marcus.shawcroft@arm.com>

	* Makefile.in (gengtype-lex.o): Add dependency on $(BCONFIG_H).

--- gcc-4.7.2/gcc/Makefile.in.~1~	2012-08-06 16:34:27.000000000 +0200
+++ gcc-4.7.2/gcc/Makefile.in	2012-12-02 18:35:01.000000000 +0100
@@ -3888,7 +3888,7 @@ build/genflags.o : genflags.c $(RTL_BASE
   $(SYSTEM_H) coretypes.h $(GTM_H) errors.h $(READ_MD_H) gensupport.h
 build/gengenrtl.o : gengenrtl.c $(BCONFIG_H) $(SYSTEM_H) rtl.def
 gengtype-lex.o build/gengtype-lex.o : gengtype-lex.c gengtype.h $(SYSTEM_H)
-gengtype-lex.o: $(CONFIG_H)
+gengtype-lex.o: $(CONFIG_H) $(BCONFIG_H)
 build/gengtype-lex.o: $(BCONFIG_H)
 gengtype-parse.o build/gengtype-parse.o : gengtype-parse.c gengtype.h \
   $(SYSTEM_H)