From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id E06843858C5E for ; Mon, 3 Apr 2023 08:07:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org E06843858C5E Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680509234; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type; bh=K7gS/tR3BNOAC9SoAhBtucNEEAjM6mbjtrD8wOPOl/M=; b=D1wzxJg+WTGvjzlzAE7vs2sLIm8ZsoZ5/X+h/UGxcHEvs6KtwBDrBliYOumsZWL+B6eoEH TgA94MweR8Ot9gLvo+cgYP/dyXN9ibsNAEbroR6Gl68fYkr4DjB6fuzKdTgT6tnNV7UC9V TIzsP0bv8G1djZJdB5P3dA1sESP7q5s= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-402-IWTWl8I8MaWTVfC58UYz_g-1; Mon, 03 Apr 2023 04:07:13 -0400 X-MC-Unique: IWTWl8I8MaWTVfC58UYz_g-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 33709101A552 for ; Mon, 3 Apr 2023 08:07:13 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.192.85]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8DAA1175AD for ; Mon, 3 Apr 2023 08:07:12 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: Using glibc headers with non-GCC compilers which define _Float32 etc. Date: Mon, 03 Apr 2023 10:07:10 +0200 Message-ID: <87o7o575jl.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: We have a downstream bug that points out that if __GNUC__ is not defined, glibc assumes that it's necessary to define _Float32 as a typedef to float: glibc: _FloatN and _FloatNx problem if _GNUC__ is not defined That does not work if the compiler already defines _Float32. What should we do about this? The suggestion to provide the definition for __STDC_WANT_IEC_60559_TYPES_EXT__ requires additional glibc header file changes, I think. Other headers assume that _Float32 is available, one way or another, and if __STDC_WANT_IEC_60559_TYPES_EXT__ is defined and the compiler does not _Float32 (say Clang, or old GCC), then those headers will break. Thanks, Florian