From f5fddd6325ee30b4910a7e640b56feabab3d011d Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 8 Apr 2021 17:42:30 -0700
Subject: build: calm restless yacc.

* Makefile (%.tab.c %.tab.h): Remove the trick of keeping the
old y.tab.h file if it has not changed. This was once a good
idea, but now that we have a proper grouped targets pattern
rule which knows that y.tab.h depends on and is produced from
parser.y, the trick causes y.tab.h to be perpetually out of
date due to its old time stamp, and so yacc is run on every
build.
---
 Makefile | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 521b894f..fe007c88 100644
--- a/Makefile
+++ b/Makefile
@@ -280,15 +280,10 @@ lex.yy.c: $(top_srcdir)parser.l
 
 %.tab.c %.tab.h: $(top_srcdir)parser.%
 	$(call ABBREV,YACC)
-	$(call SH,                                              \
-	  if [ -e y.tab.h ]; then mv y.tab.h y.tab.h.old ; fi)
-	$(call SH,rm -f y.tab.c)
+	$(call SH,rm -f y.tab.c y.tab.h)
 	$(call SH,                                              \
 	  if $(TXR_YACC) -v -d $< ; then                        \
 	    chmod a-w y.tab.c ;                                 \
-	    if cmp -s y.tab.h y.tab.h.old ; then                \
-	      mv y.tab.h.old y.tab.h ;                          \
-	    fi ;                                                \
 	  else                                                  \
 	    rm y.tab.c ;                                        \
 	    false ;                                             \
-- 
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