gentoo-overlay/sys-apps/nawk/files/nawk-20180827-parallel-build.patch

From fa4a9fd729a57a314f0aa10897216ce3b60ec653 Mon Sep 17 00:00:00 2001
From: Christoph Junghans <ottxor@gentoo.org>
Date: Mon, 10 Feb 2014 22:38:22 -0700
Subject: [PATCH] fixed parallel build

---
 makefile | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/makefile b/makefile
index ae80e4d..b3c8f9d 100644
--- a/makefile
+++ b/makefile
@@ -54,10 +54,15 @@ a.out:	ytab.o $(OFILES)
 
 $(OFILES):	awk.h ytab.h proto.h
 
-ytab.c:	awk.h proto.h awkgram.y
+#Clear dependency for parallel build: (make -j)
+#YACC generated y.tab.c and y.tab.h at the same time
+#this needs to be a static pattern rules otherwise multiple target
+#are mapped onto multiple executions of yacc, which overwrite 
+#each others outputs.
+y%.c y%.h:	awk.h proto.h awkgram.y
 	$(YACC) $(YFLAGS) awkgram.y
-	mv y.tab.c ytab.c
-	mv y.tab.h ytab.h
+	mv y.$*.c y$*.c
+	mv y.$*.h y$*.h
 
 ytab.h:	ytab.c
 
-- 
2.19.2