GNU bug report logs - #19020
improve support for flex in C++ mode

Message received at 19020 <at> debbugs.gnu.org:

Received: (at 19020) by debbugs.gnu.org; 19 Dec 2014 19:54:02 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Fri Dec 19 14:54:02 2014
Received: from localhost ([127.0.0.1]:51814 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.80)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1Y23cg-0006XU-Ab
	for submit <at> debbugs.gnu.org; Fri, 19 Dec 2014 14:54:02 -0500
Received: from mail-wi0-f169.google.com ([209.85.212.169]:38286)
 by debbugs.gnu.org with esmtp (Exim 4.80)
 (envelope-from <stefano.lattarini@HIDDEN>)
 id 1Y23cc-0006Ww-Op; Fri, 19 Dec 2014 14:54:00 -0500
Received: by mail-wi0-f169.google.com with SMTP id r20so5730518wiv.2;
 Fri, 19 Dec 2014 11:53:57 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=message-id:date:from:mime-version:to:subject:references:in-reply-to
 :content-type:content-transfer-encoding;
 bh=B1eGsFMtdkN19J6PROOGYDg5jPRxUQGzYmrnQly4x54=;
 b=NHW74pBBy7Haxm80gFQN+L6sQ5JGS6gr79e1GvU5zrMsALUPylGOXTByiHFhhTkpSD
 NJV3hR7NhtAupHjb0EtYtuvNSLQIcqiNAKxrqSPjTL/ZQjQkgT6QLBd1BQ0l93iioSaK
 skM71YrB7cGfzd60dCC3rcJKWT44T++nO6jZGFQd/bMmN1f/KVdfeOK78GAmeJTUojp9
 kCnKEHWw7adxZEBnsid56WAzMWB+xmQq8mExgdvWBNDEhj2TccxbmbmXu0hQNv6rbYdP
 dxjaH91RMUFxYX4L9kywVlWRtsnyryFslz6yDKnieqCw9czciRx4JCAUhhK6S8t+JrPi
 Rw/g==
X-Received: by 10.180.11.140 with SMTP id q12mr8883813wib.45.1419018837804;
 Fri, 19 Dec 2014 11:53:57 -0800 (PST)
Received: from [192.168.0.101]
 (host159-94-dynamic.7-79-r.retail.telecomitalia.it. [79.7.94.159])
 by mx.google.com with ESMTPSA id jp3sm3490445wid.9.2014.12.19.11.53.56
 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
 Fri, 19 Dec 2014 11:53:57 -0800 (PST)
Message-ID: <54948253.4080503@HIDDEN>
Date: Fri, 19 Dec 2014 20:53:55 +0100
From: Stefano Lattarini <stefano.lattarini@HIDDEN>
MIME-Version: 1.0
To: brahim sahbi <brahim.sahbi@HIDDEN>, 19020 <at> debbugs.gnu.org
Subject: Re: bug#19020: flex support
References: <CAD9QuOqGx_-OoxjyUk2zBVGWDxfXo+-JBm-G5uk12ZufwJOL=Q@HIDDEN>
In-Reply-To: <CAD9QuOqGx_-OoxjyUk2zBVGWDxfXo+-JBm-G5uk12ZufwJOL=Q@HIDDEN>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Spam-Score: -0.7 (/)
X-Debbugs-Envelope-To: 19020
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: -0.7 (/)

retitle 19020 improve support for flex in C++ mode
tags 19020 + moreinfo
thanks

Reference: http://debbugs.gnu.org/19020

On 11/11/2014 11:51 AM, brahim sahbi wrote:
> Hello,
>
Hi, sorry for the delay.

> I am trying to use flex with these options
> AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
> My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
> So this command in the generated Makefile:
> .lpp.cpp:
>      $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
> -- $(LEXCOMPILE)
>
> turns my lang.lpp to lang.cppc
>
> I have looked in the ylwrap by launching it with $(SHELL) -x and had this
> printed
> ++ printf '%s\n' lex.yy.cc
> ++ sed 's|lex\.yy\.c|lang.cpp|g;'
> + to=lang.cppc
>
> Am I doing it worng or is this a bug?
>
This is sadly a limitation, in that we must assume that the output generated
by lex and flex when a '-o' option is not given is 'yy.lex.c' (this would
not be needed if we could assume the '-o' option works, but that assumption
is not portable enough yet).  The --c++ option of flex seem to break this
expectation of the ylwrap script.  I *think* it can be worked around by
explicitly adding "-o lex.yy.c" to your AM_LFLAGS.  Can you verify that
solves your problem?

Thanks,
   Stefano

Message received at submit <at> debbugs.gnu.org:

Received: (at submit) by debbugs.gnu.org; 11 Nov 2014 16:41:41 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Tue Nov 11 11:41:41 2014
Received: from localhost ([127.0.0.1]:57538 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.80)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1XoEVg-00056E-AP
	for submit <at> debbugs.gnu.org; Tue, 11 Nov 2014 11:41:40 -0500
Received: from eggs.gnu.org ([208.118.235.92]:33197)
 by debbugs.gnu.org with esmtp (Exim 4.80)
 (envelope-from <brahim.sahbi@HIDDEN>) id 1Xo92Z-0003wJ-R6
 for submit <at> debbugs.gnu.org; Tue, 11 Nov 2014 05:51:16 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <brahim.sahbi@HIDDEN>) id 1Xo92Y-0007aZ-Hk
 for submit <at> debbugs.gnu.org; Tue, 11 Nov 2014 05:51:15 -0500
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org
X-Spam-Level: 
X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,FREEMAIL_FROM,
 HTML_MESSAGE,T_DKIM_INVALID autolearn=disabled version=3.3.2
Received: from lists.gnu.org ([2001:4830:134:3::11]:45630)
 by eggs.gnu.org with esmtp (Exim 4.71)
 (envelope-from <brahim.sahbi@HIDDEN>) id 1Xo92Y-0007aV-Ej
 for submit <at> debbugs.gnu.org; Tue, 11 Nov 2014 05:51:14 -0500
Received: from eggs.gnu.org ([2001:4830:134:3::10]:34918)
 by lists.gnu.org with esmtp (Exim 4.71)
 (envelope-from <brahim.sahbi@HIDDEN>) id 1Xo92X-0004NH-4i
 for bug-automake@HIDDEN; Tue, 11 Nov 2014 05:51:14 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <brahim.sahbi@HIDDEN>) id 1Xo92T-0007aA-Qh
 for bug-automake@HIDDEN; Tue, 11 Nov 2014 05:51:13 -0500
Received: from mail-wg0-x236.google.com ([2a00:1450:400c:c00::236]:60923)
 by eggs.gnu.org with esmtp (Exim 4.71)
 (envelope-from <brahim.sahbi@HIDDEN>) id 1Xo92T-0007Zw-Jb
 for bug-automake@HIDDEN; Tue, 11 Nov 2014 05:51:09 -0500
Received: by mail-wg0-f54.google.com with SMTP id n12so11549287wgh.41
 for <bug-automake@HIDDEN>; Tue, 11 Nov 2014 02:51:07 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:date:message-id:subject:from:to:content-type;
 bh=u8I4A0e03tGsOfP09OLskXsF4RB+72xiz3mFs/aMJ5k=;
 b=VewnCwhQb9warfJw71ihWgXOni0Apfk3PrQx6kO0FbsduadSPr5465+m3EBXa37TDt
 k/2Qyc7IAEfK5fJmJTjCxy0gbWefBrHmNDihUJzPtFZJlGaqBrSe+8xX6XKnX9ZjxVlx
 J+ysotbuoxoRZ1ksiXjRunKZmj0t1bj4197c/y0CvSXyvBgFORoeusRXOEhGK67d2QzO
 +WxGI87MD6zBQ+ipQkQgxJxNSAgG8G5Cly2r30C6dz/iQYGLTSDFJK1baZGVGMT+6uQ3
 qn1Z/zQK8LxRTY51sQLqQEKxnQCgRy6Vyftk/GuhYCV9has3eudVL3DBuajGgI/i91gf
 1Kqg==
MIME-Version: 1.0
X-Received: by 10.180.104.232 with SMTP id gh8mr6654499wib.78.1415703067703;
 Tue, 11 Nov 2014 02:51:07 -0800 (PST)
Received: by 10.194.13.227 with HTTP; Tue, 11 Nov 2014 02:51:07 -0800 (PST)
Date: Tue, 11 Nov 2014 11:51:07 +0100
Message-ID: <CAD9QuOqGx_-OoxjyUk2zBVGWDxfXo+-JBm-G5uk12ZufwJOL=Q@HIDDEN>
Subject: flex support
From: brahim sahbi <brahim.sahbi@HIDDEN>
To: bug-automake@HIDDEN
Content-Type: multipart/alternative; boundary=f46d04428dc6753f830507930eac
X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address
 (bad octet value).
X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address
 (bad octet value).
X-Received-From: 2001:4830:134:3::11
X-Spam-Score: -4.0 (----)
X-Debbugs-Envelope-To: submit
X-Mailman-Approved-At: Tue, 11 Nov 2014 11:41:38 -0500
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: -4.0 (----)

--f46d04428dc6753f830507930eac
Content-Type: text/plain; charset=UTF-8

Hello,

I am trying to use flex with these options
AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
So this command in the generated Makefile:
.lpp.cpp:
    $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
-- $(LEXCOMPILE)

turns my lang.lpp to lang.cppc

I have looked in the ylwrap by launching it with $(SHELL) -x and had this
printed
++ printf '%s\n' lex.yy.cc
++ sed 's|lex\.yy\.c|lang.cpp|g;'
+ to=lang.cppc

Am I doing it worng or is this a bug?

Thanks.

-- 
Brahim SAHBI

--f46d04428dc6753f830507930eac
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hello,<br><br></div>I am trying to use flex with thes=
e options<br clear=3D"all"><div><div>AM_LFLAGS =3D --header-file=3Dlang.h -=
-yyclass=3DLang --c++<br></div><div>My problem is that the file generated b=
y lex is <a href=3D"http://lex.yy.cc">lex.yy.cc</a> and not lex.yy.c.<br></=
div><div>So this command in the generated Makefile:<br>.lpp.cpp:<br>=C2=A0=
=C2=A0=C2=A0 $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $&lt; $(LEX_OUTPU=
T_ROOT).c $@ -- $(LEXCOMPILE)<br><br></div><div>turns my lang.lpp to lang.c=
ppc<br><br></div><div>I have looked in the ylwrap by launching it with $(SH=
ELL) -x and had this printed<br>++ printf &#39;%s\n&#39; <a href=3D"http://=
lex.yy.cc">lex.yy.cc</a><br>++ sed &#39;s|lex\.yy\.c|lang.cpp|g;&#39;<br>+ =
to=3Dlang.cppc<br><br></div><div>Am I doing it worng or is this a bug?<br><=
br></div><div>Thanks.<br><br></div><div>-- <br><div class=3D"gmail_signatur=
e">Brahim SAHBI<br></div>
</div></div></div>

--f46d04428dc6753f830507930eac--