GNU bug report logs - #26644
[m4/libtool.m4] TCC and unsupported option '-fPIC'

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

Received: (at submit) by debbugs.gnu.org; 24 Apr 2017 19:52:43 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Mon Apr 24 15:52:43 2017
Received: from localhost ([127.0.0.1]:38310 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1d2k2L-0002sA-JR
	for submit <at> debbugs.gnu.org; Mon, 24 Apr 2017 15:52:41 -0400
Received: from eggs.gnu.org ([208.118.235.92]:41370)
 by debbugs.gnu.org with esmtp (Exim 4.84_2)
 (envelope-from <marcir86@HIDDEN>) id 1d2k0K-0002oy-1S
 for submit <at> debbugs.gnu.org; Mon, 24 Apr 2017 15:50:36 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <marcir86@HIDDEN>) id 1d2k0D-0005KY-Mn
 for submit <at> debbugs.gnu.org; Mon, 24 Apr 2017 15:50:30 -0400
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org
X-Spam-Level: *
X-Spam-Status: No, score=1.1 required=5.0 tests=BAYES_50,
 FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,T_DKIM_INVALID autolearn=disabled
 version=3.3.2
Received: from lists.gnu.org ([2001:4830:134:3::11]:37947)
 by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32)
 (Exim 4.71) (envelope-from <marcir86@HIDDEN>) id 1d2k0D-0005KK-Iz
 for submit <at> debbugs.gnu.org; Mon, 24 Apr 2017 15:50:29 -0400
Received: from eggs.gnu.org ([2001:4830:134:3::10]:60562)
 by lists.gnu.org with esmtp (Exim 4.71)
 (envelope-from <marcir86@HIDDEN>) id 1d2k0C-00069r-3F
 for bug-libtool@HIDDEN; Mon, 24 Apr 2017 15:50:29 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <marcir86@HIDDEN>) id 1d2k0B-0005Iz-6Q
 for bug-libtool@HIDDEN; Mon, 24 Apr 2017 15:50:28 -0400
Received: from mail-qk0-x22d.google.com ([2607:f8b0:400d:c09::22d]:36337)
 by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
 (Exim 4.71) (envelope-from <marcir86@HIDDEN>) id 1d2k0B-0005IP-0W
 for bug-libtool@HIDDEN; Mon, 24 Apr 2017 15:50:27 -0400
Received: by mail-qk0-x22d.google.com with SMTP id u75so30174531qka.3
 for <bug-libtool@HIDDEN>; Mon, 24 Apr 2017 12:50:26 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;
 h=mime-version:from:date:message-id:subject:to;
 bh=tNaNvi6nOBcU0Kss4x2hobY2oXPC/85dhRNVwmkdmr0=;
 b=rvXpHpinwwxph+3IgRn1WOe/vtUSEpGOswCGCHx1yT9bxZRVJ049TJgojf8xkh2Omz
 VKI345K5s8f6Q4l0DcWiOAinH/67wicf+JuxyORLNdnXsJJvLrzjKBOin0vPVe4UWB+A
 E/36zjwQ+/M3KeUP1pNhTfW/BHKfeTGi2tuLJ5+vGlqGiD6PS1StjYsEVFWzJ/630dF+
 wRGKblC/0Y5GKCN6OC94PLAzotS4u4c65MibJXcazXlaFIq34WAhXt7prFJUUixT/oLB
 9bwtPpmHYdcVbheQoEGde+nrbHsY7KbwdHRUMCUe+LmrC9HdroS8STNScR2yE82LYuTc
 h7vg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20161025;
 h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
 bh=tNaNvi6nOBcU0Kss4x2hobY2oXPC/85dhRNVwmkdmr0=;
 b=V+YNdu4mtkTQhufY9OZta/43Q95EdBMUyRa2ma9U/N/HQEZxs1UhcLRFf2wq6UnZaW
 ovWbh07Xg5JrORD1oqmMKkATs1a+4sxM6WUxvTfY1bOcys9jTex9s8N3JyC2IC4YkD0a
 i78nxDCuCNMyJJCfBBJXyV+Y7ej4lpobvz77F+gyfGZQ2yy8Akbuu0o22drBl5wDNIpo
 SIhJ1g2z74K8EnmaSZU/oGN2wf/LbSootU3CZlTLWoufdriJtu2vfTUhIZvh08Kjq5Vj
 iGgruPE9mZYC4GE12olbjtpJJVXW+AvStNpaAVwYPLzGeJhY1JlknsDdUEFuz/WN0ooe
 uhDw==
X-Gm-Message-State: AN3rC/55rYn+0pbmwoKvAf7nRLRSzUaLmpkwV52axFFqloL0n3DF0u9s
 i2ofnf/r/C7cgclMF55inmRWE3YjcQ31HaE=
X-Received: by 10.55.26.215 with SMTP id l84mr16480223qkh.307.1493063425723;
 Mon, 24 Apr 2017 12:50:25 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.200.35.71 with HTTP; Mon, 24 Apr 2017 12:50:25 -0700 (PDT)
From: Marcel Raad <marcir86@HIDDEN>
Date: Mon, 24 Apr 2017 21:50:25 +0200
Message-ID: <CAM5M4RHGFA8fZ6Y8rSWeeUYm4rtN_9rCmh2NgxiMUEn30xFz3A@HIDDEN>
Subject: [m4/libtool.m4] TCC and unsupported option '-fPIC'
To: bug-libtool@HIDDEN
Content-Type: text/plain; charset=UTF-8
X-detected-operating-system: by eggs.gnu.org: Genre and OS details not
 recognized.
X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x
X-Received-From: 2001:4830:134:3::11
X-Spam-Score: -3.8 (---)
X-Debbugs-Envelope-To: submit
X-Mailman-Approved-At: Mon, 24 Apr 2017 15:52:40 -0400
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.18
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: -3.8 (---)

Hi,

I'm building curl [1] with TCC (Tiny C compiler) on Linux. For every
compiled source file, I get:
tcc: warning: unsupported option '-fPIC'

What I do is
./configure --enable-warnings CC=tcc && make
which enables warnings about unsupported GCC options (-Wunsupported)
at build time, but not at configure time.

libtool.m4 adds -fPIC, but according to the TCC documentation [2], TCC
doesn't support PIC at all.

I'm using Ubuntu 16.04 with libtool 2.4.6 and TCC 0.9.26.

[1] https://github.com/curl/curl/
[2] http://bellard.org/tcc/tcc-doc.html#SEC17

Thanks,
Marcel