From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dedi548.your-server.de (dedi548.your-server.de [85.10.215.148]) by sourceware.org (Postfix) with ESMTPS id 561503858D37 for ; Tue, 14 Jul 2020 08:00:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 561503858D37 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=embedded-brains.de Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=sebastian.huber@embedded-brains.de Received: from sslproxy03.your-server.de ([88.198.220.132]) by dedi548.your-server.de with esmtpsa (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89_1) (envelope-from ) id 1jvFrz-0004Ny-Gd; Tue, 14 Jul 2020 10:00:55 +0200 Received: from [82.100.198.138] (helo=mail.embedded-brains.de) by sslproxy03.your-server.de with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92) (envelope-from ) id 1jvFrz-000Uie-C3; Tue, 14 Jul 2020 10:00:55 +0200 Received: from localhost (localhost.localhost [127.0.0.1]) by mail.embedded-brains.de (Postfix) with ESMTP id 422102A1610; Tue, 14 Jul 2020 10:01:24 +0200 (CEST) Received: from mail.embedded-brains.de ([127.0.0.1]) by localhost (zimbra.eb.localhost [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id na2zl4s8K8Mr; Tue, 14 Jul 2020 10:01:24 +0200 (CEST) Received: from localhost (localhost.localhost [127.0.0.1]) by mail.embedded-brains.de (Postfix) with ESMTP id EFE892A165B; Tue, 14 Jul 2020 10:01:23 +0200 (CEST) X-Virus-Scanned: amavisd-new at zimbra.eb.localhost Received: from mail.embedded-brains.de ([127.0.0.1]) by localhost (zimbra.eb.localhost [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id gs8OrZN0QNvL; Tue, 14 Jul 2020 10:01:23 +0200 (CEST) Received: from shuber-nb-linux.eb.localhost (unknown [10.10.171.22]) by mail.embedded-brains.de (Postfix) with ESMTPSA id BF3432A1610; Tue, 14 Jul 2020 10:01:23 +0200 (CEST) To: Newlib From: Sebastian Huber Subject: fenv soft-float support Message-ID: <5281ca5f-527b-20ec-62e8-118a157d1219@embedded-brains.de> Date: Tue, 14 Jul 2020 10:00:54 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Authenticated-Sender: smtp-embedded@poldinet.de X-Virus-Scanned: Clear (ClamAV 0.102.3/25872/Mon Jul 13 16:11:24 2020) X-Spam-Status: No, score=-6.6 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, SPF_HELO_NONE, SPF_PASS, TXREP 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: newlib@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Newlib mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Jul 2020 08:01:00 -0000 Hello, the recent fenv patches added support for the soft-float implementation of FreeBSD. Newlib uses the one from libgcc by default. They are not compatible. Having an GCC incompatible soft-float fenv support in Newlib makes no sense to me. How can we fix this? As a short-term fix, I would remove the FreeBSD fenv support. What should we provide instead? I would just provide the hardware implementation of the architecture for now. If someone uses this in a soft-float configuration, he may get exceptions or some sort of undefined behaviour. This is what you get on powerpc currently. A long-term solution would be to add support for the GCC soft-float implementation in libgcc. This requires changes in the GCC configuration. I guess this is a bit of work.