X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 76CD0394202F
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1584453610;
	bh=pOxM6nacz9SpdxfaJKTFqN0CMVxNk30R1udOZ98mfiE=;
	h=Subject:To:References:Date:In-Reply-To:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:
	From;
	b=OEREUrirFGRns2uC9T0fD4UjTJvNepv9hVyURzjkJFAflivtAKKozgWE3Akf+gsEa
	AnelEKp2uycitKMT0Qkg013KZsXRR7gtDBZWHZQ/YJXuLF8eNi3AwzLQ8j3py5Z5tZ
	e69p7lxjskr6O7NDhRpkB3mQE6+mXo1dGDJ2zJ6c=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DKIM-Filter:	OpenDKIM Filter v2.10.3 mail.efficios.com E2EA4274B8E
X-Virus-Scanned:	amavisd-new at efficios.com
Subject:	Re: Control sequences output when testing GDB
To:	cygwin AT cygwin DOT com
References:	<606a1134-7bfa-17da-3540-b32ba4592a7a AT efficios DOT com>
Message-ID:	<1be7e623-b39a-e76f-8a1e-fcde64404801@efficios.com>
Date:	Tue, 17 Mar 2020 10:00:06 -0400
User-Agent:	Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
	Thunderbird/68.6.0
MIME-Version:	1.0
In-Reply-To:	<606a1134-7bfa-17da-3540-b32ba4592a7a@efficios.com>
X-Spam-Status:	No, score=-0.2 required=5.0 tests=DKIM_SIGNED, DKIM_VALID,
	DKIM_VALID_AU, DKIM_VALID_EF, SPF_HELO_NONE,
	SPF_PASS autolearn=ham autolearn_force=no version=3.4.2
X-Spam-Checker-Version:	SpamAssassin 3.4.2 (2018-09-13) on
	server2.sourceware.org
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.29
List-Id:	Cygwin mailing list <cygwin.cygwin.com>
List-Unsubscribe:	<http://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<http://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<http://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Simon Marchi via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Simon Marchi <simon DOT marchi AT efficios DOT com>
Errors-To:	cygwin-bounces AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces AT cygwin DOT com>

On 2020-03-17 9:51 a.m., Simon Marchi wrote:
> Hi,
> 
> I had to make a GDB fix related to Cygwin recently, so I tried to run some tests
> from the GDB testsuite on Cygwin.  This is my first foray into Cygwin.
> 
> The test I ran failed, because the GDB under test outputs what appears to be control
> sequences to clear the remaining characters of the line and go to the new line.  What's
> surprising is that these control characters only start to appear when we use the "run"
> command of GDB, which makes GDB spawn the process to debug.
> 
> The full test log is here:
> 
>   https://pastebin.com/raw/m6JYGRvs
> 
> But here are a few lines around where it starts getting interesting:
> 
>   (gdb) break main
>   Breakpoint 1 at 0x1004012e3: file /home/smarchi/src/binutils-gdb/gdb/testsuite/gdb.base/sizeof.c, line 101.
>   (gdb) run
>   Starting program: /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.base/sizeof/sizeof
>   [?25lType "apropos word" to search for commands related to "word".
>   (gdb) set height 0
>   (gdb) set width 0
>   (gdb) dir
> 
> The numbers match the number of characters left to the line, after what has already been
> output (for a total of 80).  According to [1], the 'X' is "Erase Character" and the 'C' is
> "Cursor Forward".
> 
> When the program starts, we also see one for "Text Cursor Enable Mode Hide".
> 
> These control sequences are a bit problematic, because all the text that the testsuite
> is supposed to match is not matched, and the tests fail.
> 
> It was suggested to me (by jturney on IRC) to use:
> 
>   export CYGWIN=disable_pcon
> 
> To disable to use the new new Windows Pseudo Console thing.  And indeed, it makes the output
> free of these escape sequences, and the test passes fine.
> 
> Anybody can explain what is happening, and what we should do about it?
> 
> Thanks,
> 
> Simon
> 
> [1] https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences
> 

Oh well, I just saw this response from Ken earlier today (sorry about
that, I'm not subscribed to the list):

  https://sourceware.org/pipermail/cygwin/2020-March/244091.html

So I guess there's no explanation yet, just the workaround.

Simon
--
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -