bug#20894: make libgnu.a doesn't generate everything it requires

[Paul Eggert <eggert@cs.ucla.edu>]

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Glenn Morris wrote:
> 'make -C src emacs' now works, but 'make -j8 -C src emacs' fails in lib with
>
>    GEN      stddef.h
>    mv: cannot stat 'alloca.h-t': No such file or directory

Hmm, well, I'm sure there are other dependency bugs like that in the makefiles 
somewhere.  Anyway I fixed this bug with the attached.

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From 1dbeff026f3dd8244d648501cfcb84621dc3a655 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 25 Jun 2015 13:31:18 -0700
Subject: [PATCH] Fix submake dependency bug with .h files

* src/Makefile.in ($(libsrc)/make-docfile$(EXEEXT)):
Depend on $(lib)/libgnu.a, so that we build $(lib)/*/*.h
before the submake in $(libsrc) would spin off a subsubmake
for $(lib) in parallel with our submake for $(lib) (Bug#20894).
---
 src/Makefile.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Makefile.in b/src/Makefile.in
index bfb911e..1fb770d 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -529,7 +529,7 @@ $(etc)/DOC: lisp.mk $(libsrc)/make-docfile$(EXEEXT) $(obj) $(lisp)
 	$(AM_V_at)$(libsrc)/make-docfile -a $(etc)/DOC -d $(lispsource) \
 	  $(shortlisp)
 
-$(libsrc)/make-docfile$(EXEEXT):
+$(libsrc)/make-docfile$(EXEEXT): $(lib)/libgnu.a
 	$(MAKE) -C $(libsrc) make-docfile$(EXEEXT)
 
 buildobj.h: Makefile
-- 
2.1.4