[src/trunk]: src/usr.bin/xlint/lint1 lint: make stdout unbuffered in debug mode

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f7177a489b83
branches:  trunk
changeset: 1022084:f7177a489b83
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Jul 03 20:43:35 2021 +0000

description:
lint: make stdout unbuffered in debug mode

Some debug log messages are on stdout, others on stderr.  Make sure that
they occur in the correct order, even when the output is redirected.

diffstat:

 usr.bin/xlint/lint1/main1.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r a834b4231aa6 -r f7177a489b83 usr.bin/xlint/lint1/main1.c
--- a/usr.bin/xlint/lint1/main1.c       Sat Jul 03 20:40:17 2021 +0000
+++ b/usr.bin/xlint/lint1/main1.c       Sat Jul 03 20:43:35 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main1.c,v 1.46 2021/06/27 18:48:45 rillig Exp $        */
+/*     $NetBSD: main1.c,v 1.47 2021/07/03 20:43:35 rillig Exp $        */
 
 /*
  * Copyright (c) 1994, 1995 Jochen Pohl
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: main1.c,v 1.46 2021/06/27 18:48:45 rillig Exp $");
+__RCSID("$NetBSD: main1.c,v 1.47 2021/07/03 20:43:35 rillig Exp $");
 #endif
 
 #include <sys/types.h>
@@ -254,6 +254,8 @@
        /* initialize output */
        outopen(argv[1]);
 
+       if (dflag)
+               setvbuf(stdout, NULL, _IONBF, 0);
 #ifdef YYDEBUG
        if (yflag)
                yydebug = 1;