strace.c: inform the user about -F option obsolescence

* strace.c (init): Print an error message if the option is used.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/strace.c b/strace.c
index 6fbea45f1..712624518 100644
--- a/strace.c
+++ b/strace.c
@@ -1716,8 +1716,15 @@ init(int argc, char *argv[])
 		error_msg_and_help("PROG [ARGS] must be specified with -D");
 	}
 
-	if (!followfork)
-		followfork = optF;
+	if (optF) {
+		if (followfork) {
+			error_msg("deprecated option -F ignored");
+		} else {
+			error_msg("option -F is deprecated, "
+				  "please use -f instead");
+			followfork = optF;
+		}
+	}
 
 	if (followfork >= 2 && cflag) {
 		error_msg_and_help("(-c or -C) and -ff are mutually exclusive");