From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by sourceware.org (Postfix) with ESMTPS id 76D153858D28 for ; Sat, 26 Mar 2022 16:54:51 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 76D153858D28 Received: by mail-wr1-x433.google.com with SMTP id b19so14600335wrh.11 for ; Sat, 26 Mar 2022 09:54:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:content-transfer-encoding:mime-version :subject:message-id:date:cc:to; bh=DC/qbt9Ll2UbqnLaZFX8JQecIxnLOAMTxBIzH6CLi7Y=; b=POOujuAmxbYeZnOempHLP/Cv8O0P1HIxxQzi+o02btTqHzQy6m7LkOUE8QZU4EwLMl XbNEVuu9rRaBnJBzxLRrksbG3k1++mBIZH+rSPmRqYc4X0Nxr2FmASz76EzKU4imPtsx GDwaEl3Fc8DBcoPSNbZG1AtMl+0y72dESoFToray+Shtue5iPFNN36p3EQAz0Co7YkIn e+8J/xNcm+mj83SEpiUw56BA+lyjZ46oRhGwhNyEwKf3D0D5bxGgupCQpkKw3a6F6sTo /ceQ/V2iEfGxEuAqK9DMBD65dzu+J7GZzKdvzMPhRtobQaGKPtGDbyfjcuPwDBgw86Pk ytVg== X-Gm-Message-State: AOAM533CSYwVN36EU0fg3vw1T58wpJiCwjfzXOOxtE0K+DZTPX0I3JHZ n2BbGQiTm0RWqtgfoJc4aEo= X-Google-Smtp-Source: ABdhPJxypXIEUXlgXBJ+NHpwZulpCtsbWJ3VMe55fIsUCCVciMQcXCUX9e7+ftcP0y/SG42Mf7vfgw== X-Received: by 2002:adf:fd02:0:b0:203:f2aa:37f2 with SMTP id e2-20020adffd02000000b00203f2aa37f2mr14449773wrr.396.1648313690111; Sat, 26 Mar 2022 09:54:50 -0700 (PDT) Received: from smtpclient.apple ([2a01:e34:ec28:8cb0:79d6:d1df:6364:e1c5]) by smtp.gmail.com with ESMTPSA id p15-20020a05600c358f00b0038cc046cb2esm11422786wmq.32.2022.03.26.09.54.49 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 26 Mar 2022 09:54:49 -0700 (PDT) From: FX Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.80.82.1.1\)) Subject: Re: [PATCH] middle-end/100786 - constant folding from incompatible alias Message-Id: <00C2A5E0-35E0-4BEF-9780-69ADB0731F3F@gmail.com> Date: Sat, 26 Mar 2022 17:54:49 +0100 Cc: gcc-patches@gcc.gnu.org, Iain Sandoe To: rguenther@suse.de X-Mailer: Apple Mail (2.3696.80.82.1.1) X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FAKE_REPLY_B, FREEMAIL_FROM, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Mar 2022 16:54:54 -0000 Hi Richard, The patch for PR100786 introduced a testcase that systematically fails = on darwin: FAIL: gcc.dg/torture/pr100786.c -O0 (test for excess errors) FAIL: gcc.dg/torture/pr100786.c -O1 (test for excess errors) FAIL: gcc.dg/torture/pr100786.c -O2 (test for excess errors) FAIL: gcc.dg/torture/pr100786.c -O2 -flto (test for excess errors) FAIL: gcc.dg/torture/pr100786.c -O2 -flto -flto-partition=3Dnone = (test for excess errors) FAIL: gcc.dg/torture/pr100786.c -O3 -g (test for excess errors) FAIL: gcc.dg/torture/pr100786.c -Os (test for excess errors) see https://gcc.gnu.org/pipermail/gcc-testresults/2022-March/757882.html because pr100786.c:4:12: error: only weak aliases are supported in this = configuration 4 | extern int b __attribute__((alias("a"))); | ^ pr100786.c:8:15: error: only weak aliases are supported in this = configuration 8 | extern double b2 __attribute__((alias("a2"))); | ^~ FX=