This was discussed sometime ago: don't use this extension in Got.
There's another diff incoming doing the same in diff.git

-----------------------------------------------
commit 262a2cc0ac9fc42baccd8b2521cd966278568636 (main)
from: Mark Jamsek <mark@jamsek.dev>
date: Wed Aug 31 11:40:38 2022 UTC
 
 tog: remove gcc ternary if extension
 
diff 3c8433402874be5d4f42156998646f05de8535c3 262a2cc0ac9fc42baccd8b2521cd966278568636
commit - 3c8433402874be5d4f42156998646f05de8535c3
commit + 262a2cc0ac9fc42baccd8b2521cd966278568636
blob - 6ec8b5f0c155fafe55ee2aab0653d259876e6254
blob + d3fe18a13136b64b9e9ba153ae5a2deda0482b9c
--- tog/tog.c
+++ tog/tog.c
@@ -4692,14 +4692,14 @@ show_diff_view(struct tog_view *view)
 		err = got_object_id_str(&id_str1, s->id1);
 		if (err)
 			return err;
-		label1 = s->label1 ? : id_str1;
+		label1 = s->label1 ? s->label1 : id_str1;
 	} else
 		label1 = "/dev/null";
 
 	err = got_object_id_str(&id_str2, s->id2);
 	if (err)
 		return err;
-	label2 = s->label2 ? : id_str2;
+	label2 = s->label2 ? s->label2 : id_str2;
 
 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
 		err = got_error_from_errno("asprintf");


-- 
Mark Jamsek <fnc.bsdbox.org>
GPG: F2FF 13DE 6A06 C471 CA80  E6E2 2930 DC66 86EE CF68