Re: [PATCH] mingw: make stderr unbuffered again

> When removing the hack for isatty(), we actually removed more than just
> an isatty() hack: we removed the hack where internal data structures of
> the MSVC runtime are modified in order to redirect stdout/stderr.
>
> Instead of using that hack (that does not work with newer versions of
> the runtime, anyway), we replaced it by reopening the respective file
> descriptors.
>
> What we forgot was to mark stderr as unbuffered again.
>
> Reported by Hannes Sixt. Fixed with Jeff Hostetler's assistance.
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
> Published-As: https://github.com/dscho/git/releases/tag/mingw-unbuffered-stderr-v1
> Fetch-It-Via: git fetch https://github.com/dscho/git mingw-unbuffered-stderr-v1

>
>  compat/winansi.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/compat/winansi.c b/compat/winansi.c
> index 82b89ab1376..793420f9d0d 100644
> --- a/compat/winansi.c
> +++ b/compat/winansi.c
> @@ -510,6 +510,8 @@ static HANDLE swap_osfhnd(int fd, HANDLE new_handle)
>  	 */
>  	close(new_fd);
>  
> +	if (fd == 2)
> +		setvbuf(stderr, NULL, _IONBF, BUFSIZ);
>  	fd_is_interactive[fd] |= FD_SWAPPED;
>  
>  	return duplicate;
> @@ -547,6 +549,8 @@ static void detect_msys_tty(int fd)
>  			!wcsstr(name, L"-pty"))
>  		return;
>  
> +	if (fd == 2)
> +		setvbuf(stderr, NULL, _IONBF, BUFSIZ);
>  	fd_is_interactive[fd] |= FD_MSYS;
>  }
>  
>
> base-commit: 5588dbffbd61e4906e453808c6ad32f792fea521