From c0afab671cfba7f9ce5610dbd0b2901506ee0862 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 19 Jan 2026 12:24:14 -0800
Subject: [PATCH] Omit -Wzero-as-null-pointer-constant
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* configure.ac: If --enable-gcc-warnings, don’t use
-Wzero-as-null-pointer-constant, which is enabled by default with
bleeding-edge Gnulib (as there seems to be movement in this
direction in C2y).  Although -Wzero-as-null-pointer-constant is
useful, Emacs isn’t clean for it yet.
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index 0c1c1e2d789..4615717094b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1804,6 +1804,7 @@ AS_IF([test $gl_gcc_warnings = no],
   nw="$nw -Wsync-nand"              # irrelevant here, and provokes ObjC warning
   nw="$nw -Wunsafe-loop-optimizations" # OK to suppress unsafe optimizations
   nw="$nw -Wbad-function-cast"      # These casts are no worse than others.
+  nw="$nw -Wzero-as-null-pointer-constant" # Emacs is not yet C2y-safe.
 
   # Emacs doesn't care about shadowing; see
   # <https://lists.gnu.org/r/emacs-diffs/2011-11/msg00265.html>.