>From ff81c979a9528af8065169f83a78de599e99177b Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Sun, 7 Mar 2021 20:01:37 -0800 Subject: [PATCH] On MS-Windows, fflush stderr after newline Problem reported by Ioannis Kappas (Bug#46388). * src/sysdep.c (errputc) [WINDOWSNT]: Flush stderr after newline. --- src/sysdep.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/sysdep.c b/src/sysdep.c index 941b4e2fa2..88dd3e71e4 100644 --- a/src/sysdep.c +++ b/src/sysdep.c @@ -2662,6 +2662,13 @@ errstream (void) errputc (int c) { fputc_unlocked (c, errstream ()); + +#ifdef WINDOWSNT + /* Flush stderr after outputting a newline since stderr is fully + buffered when redirected to a pipe, contrary to POSIX. */ + if (c == '\n') + fflush_unlocked (stderr); +#endif } void -- 2.29.2