From d74ffd3c2991367fbcfcbd51b258008261ca86b8 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Mon, 22 Jan 2024 22:25:34 +0100
Subject: [PATCH] autogen.sh: CFLAGS: Add some -Werror=... flags that will be
 default soon

Clang 16 and GCC 14 have upgraded several warnings to errors by default.
Also, there are new warnings that will be requirements of ISO C23.  Add
all of those to our build.

Use Clang's -Wno-unknown-attribute-option, to ignore warnings that are
exclusive of GCC.  Sadly, GCC doesn't have such an option.

Link: <https://wiki.gentoo.org/wiki/Modern_C_porting#What_changed.3F>
Link: <https://github.com/shadow-maint/shadow/issues/922>
Suggested-by: Sam James <sam@gentoo.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 autogen.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/autogen.sh b/autogen.sh
index 07236426b..a31f611cd 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -6,7 +6,11 @@ CFLAGS="-O2"
 CFLAGS="$CFLAGS -Wall"
 CFLAGS="$CFLAGS -Wextra"
 CFLAGS="$CFLAGS -Werror=implicit-function-declaration"
+CFLAGS="$CFLAGS -Werror=implicit-int"
+CFLAGS="$CFLAGS -Werror=incompatible-pointer-types"
+CFLAGS="$CFLAGS -Werror=int-conversion"
 CFLAGS="$CFLAGS -Wno-expansion-to-defined"
+CFLAGS="$CFLAGS -Wno-unknown-warning-option"
 
 "$(dirname "$0")"/configure \
 	CFLAGS="$CFLAGS" \
-- 
2.47.2