From b389733ab0fa46f2cecd302cc5826fc7dc322c8e Mon Sep 17 00:00:00 2001
From: Randy Palamar <randy@rnpnr.xyz>
Date: Sat, 6 Dec 2025 08:54:34 -0700
Subject: util: replace memrchr with internal version

The amount of code we need to detect if this is present and handle
the fallback is more than if we just provide it ourselves.

Also we are passing in a difference of pointers so the argument
type should be ptrdiff_t. This avoids a C brain damage of having
unsigned size type which can wrap around if the caller is careful.
---
 configure | 20 --------------------
 1 file changed, 20 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index a70eac1..cc00cd7 100755
--- a/configure
+++ b/configure
@@ -613,25 +613,6 @@ EOF
 	fi
 fi
 
-printf "checking for memrchr... "
-
-cat > "$tmpc" <<EOF
-#define _GNU_SOURCE
-#include <string.h>
-
-int main(int argc, char *argv[]) {
-        return !memrchr("\n", '\n', 1);
-}
-EOF
-
-if $CC $CFLAGS $CFLAGS_STD "$tmpc" $LDFLAGS -o "$tmpo" >/dev/null 2>&1; then
-	HAVE_MEMRCHR=1
-	printf "%s\n" "yes"
-else
-	HAVE_MEMRCHR=0
-	printf "%s\n" "no"
-fi
-
 printf "completing config.mk... "
 
 exec 3>&1 1>>config.mk
@@ -659,7 +640,6 @@ LDFLAGS_ACL = $LDFLAGS_ACL
 CONFIG_SELINUX = $CONFIG_SELINUX
 CFLAGS_SELINUX = $CFLAGS_SELINUX
 LDFLAGS_SELINUX = $LDFLAGS_SELINUX
-CFLAGS_LIBC = -DHAVE_MEMRCHR=$HAVE_MEMRCHR
 EOF
 exec 1>&3 3>&-
 
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