From cc19e7c24a6ddb3a958ba09766efa513f2e1885d Mon Sep 17 00:00:00 2001
From: Tony Cook <tony@develop-help.com>
Date: Mon, 4 Dec 2023 14:39:05 +1100
Subject: [PATCH] win32/GNUmakefile: disable the .y to .c implicit rule

If perly.y happens to be newer than perly.c gmake 4.4.1 wouldn't
bother trying to build the .c from .y, but it would delete the .c
as an intermediate anyway.

Fixes #21651
---
 win32/GNUmakefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/win32/GNUmakefile b/win32/GNUmakefile
index 07a193190dfc..4e7c5d8842a5 100644
--- a/win32/GNUmakefile
+++ b/win32/GNUmakefile
@@ -1904,3 +1904,6 @@ nok: utils $(PERLEXE) $(PERLDLL) Extensions_nonxs Extensions
 
 nokfile: utils $(PERLEXE) $(PERLDLL) Extensions_nonxs Extensions
 	$(PERLEXE) ..\utils\perlbug -nok -s "(UNINSTALLED)" -F perl.nok
+
+# prevent implicit rule
+%.c : %.y