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GET /api/1.1/patches/2220857/?format=api
{ "id": 2220857, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220857/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260408091202.13538-3-muhammad.kamran@arm.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260408091202.13538-3-muhammad.kamran@arm.com>", "date": "2026-04-08T09:12:02", "name": "[2/2] aarch64/testsuite: add LTO coverage for branch-protection notes and attributes", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "8a3200cd72e76a8da15fdad0c105786f562aab6b", "submitter": { "id": 92852, "url": "http://patchwork.ozlabs.org/api/1.1/people/92852/?format=api", "name": "Muhammad Kamran", "email": "muhammad.kamran@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260408091202.13538-3-muhammad.kamran@arm.com/mbox/", "series": [ { "id": 499105, "url": "http://patchwork.ozlabs.org/api/1.1/series/499105/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=499105", "date": "2026-04-08T09:12:00", "name": "aarch64/testsuite: improve object-readelf and add LTO branch-protection tests", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499105/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220857/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220857/checks/", "tags": {}, "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=jGoOe6Tr;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=jGoOe6Tr;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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dkim=pass (signature was verified)\n header.d=arm.com;dmarc=pass action=none header.from=arm.com;", "spf=pass (sender IP is 172.205.89.229)\n smtp.mailfrom=arm.com; dkim=none (message not signed)\n header.d=none;dmarc=pass action=none header.from=arm.com;" ], "Received-SPF": [ "Pass (protection.outlook.com: domain of arm.com designates\n 4.158.2.129 as permitted sender) receiver=protection.outlook.com;\n client-ip=4.158.2.129; helo=outbound-uk1.az.dlp.m.darktrace.com; pr=C", "Pass (protection.outlook.com: domain of arm.com designates\n 172.205.89.229 as permitted sender) receiver=protection.outlook.com;\n client-ip=172.205.89.229; helo=nebula.arm.com; pr=C" ], "From": "Muhammad Kamran <muhammad.kamran@arm.com>", "To": "<gcc-patches@gcc.gnu.org>", "CC": "Richard Earnshaw <richard.earnshaw@arm.com>, Tamar Christina\n <tamar.christina@arm.com>, Kyrylo Tkachov <ktkachov@nvidia.com>, \"Alice\n Carlotti\" <alice.carlotti@arm.com>, Alex Coplan <alex.coplan@arm.com>,\n \"Andrew Pinski\" <andrew.pinski@oss.qualcomm.com>, Wilco Dijkstra\n <wilco.dijkstra@arm.com>, Jakub Jelinek <jakub@redhat.com>, Rainer Orth\n <ro@CeBiTec.Uni-Bielefeld.DE>, Mike Stump <mikestump@comcast.net>, \"Muhammad\n Kamran\" <muhammad.kamran@arm.com>", "Subject": "[PATCH 2/2] aarch64/testsuite: add LTO coverage for branch-protection\n notes and attributes", "Date": "Wed, 8 Apr 2026 09:12:02 +0000", "Message-ID": "<20260408091202.13538-3-muhammad.kamran@arm.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260408091202.13538-1-muhammad.kamran@arm.com>", "References": "<20260408091202.13538-1-muhammad.kamran@arm.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; 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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n DU2PEPF00028D10.eurprd03.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Recent binutils (e.g. 2.46) switched AArch64 branch-protection emission\nfrom .note.gnu.property to build attributes\n(Tag_Feature_BTI, Tag_Feature_PAC, Tag_Feature_GCS) when GCC is\nconfigured with such toolchains.\n\nPR target/124365 exposed an issue where -flto with\n-mbranch-protection=standard caused loss of branch-protection metadata in build\nattributes. This was due to an LTO bug, now fixed upstream\n(8b39ec70741b7fb9d059b6944f30a6743dea996a).\n\nAdd tests to verify both forms in LTO builds, covering:\n\t• older binutils behaviour (.note.gnu.property), and\n\t• newer binutils behaviour (build attributes).\n\nThis ensures branch-protection metadata is preserved across LTO for both\ntoolchain configurations.\n\n\tPR target/124365\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.target/aarch64/lto/lto.exp: New DejaGnu test driver for LTO tests\n\tfor aarch64. Copied from gcc/testsuite/gcc.target/arm/lto/lto.exp with\n\tminor changes.\n\t* gcc.target/aarch64/lto/pr124365-build-attributes-1_0.c: New test\n\tfor build attributes with branch protection.\n\t* gcc.target/aarch64/lto/pr124365-build-attributes-1_1.c: Companion\n\tsource file for the LTO test.\n\t* gcc.target/aarch64/lto/pr124365-build-attributes-2_0.c: New test\n\tfor build attributes without branch protection.\n\t* gcc.target/aarch64/lto/pr124365-build-attributes-2_1.c: Companion\n\tsource file for the LTO test with branch protection enabled.\n\t* gcc.target/aarch64/lto/pr124365-gnu-property-1_0.c: New test for\n\t`.note.gnu.property` with branch protection.\n\t* gcc.target/aarch64/lto/pr124365-gnu-property-1_1.c: Companion\n\tsource file for the LTO test.\n\t* gcc.target/aarch64/lto/pr124365-gnu-property-2_0.c: New test for\n\t`.note.gnu.property` without branch protection.\n\t* gcc.target/aarch64/lto/pr124365-gnu-property-2_1.c: Companion\n\tsource file for the LTO test with branch protection enabled.\n---\n gcc/testsuite/gcc.target/aarch64/lto/lto.exp | 61 +++++++++++++++++++\n .../lto/pr124365-build-attributes-1_0.c | 18 ++++++\n .../lto/pr124365-build-attributes-1_1.c | 5 ++\n .../lto/pr124365-build-attributes-2_0.c | 18 ++++++\n .../lto/pr124365-build-attributes-2_1.c | 6 ++\n .../aarch64/lto/pr124365-gnu-property-1_0.c | 16 +++++\n .../aarch64/lto/pr124365-gnu-property-1_1.c | 5 ++\n .../aarch64/lto/pr124365-gnu-property-2_0.c | 16 +++++\n .../aarch64/lto/pr124365-gnu-property-2_1.c | 6 ++\n 9 files changed, 151 insertions(+)\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/lto.exp\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_0.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_1.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_0.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_1.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_0.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_1.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_0.c\n create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_1.c", "diff": "diff --git a/gcc/testsuite/gcc.target/aarch64/lto/lto.exp b/gcc/testsuite/gcc.target/aarch64/lto/lto.exp\nnew file mode 100644\nindex 00000000000..0c72d343174\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/lto.exp\n@@ -0,0 +1,61 @@\n+# Copyright (C) 2009-2026 Free Software Foundation, Inc.\n+\n+# This program is free software; you can redistribute it and/or modify\n+# it under the terms of the GNU General Public License as published by\n+# the Free Software Foundation; either version 3 of the License, or\n+# (at your option) any later version.\n+#\n+# This program is distributed in the hope that it will be useful,\n+# but WITHOUT ANY WARRANTY; without even the implied warranty of\n+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n+# GNU General Public License for more details.\n+#\n+# You should have received a copy of the GNU General Public License\n+# along with GCC; see the file COPYING3. If not see\n+# <http://www.gnu.org/licenses/>.\n+\n+# Exit immediately if this isn't an AArch64 target.\n+if ![istarget aarch64*-*-*] then {\n+ return\n+}\n+\n+# Test link-time optimization across multiple files.\n+#\n+# Programs are broken into multiple files. Each one is compiled\n+# separately with LTO information. The final executable is generated\n+# by collecting all the generated object files using regular LTO or WHOPR.\n+\n+if $tracelevel then {\n+ strace $tracelevel\n+}\n+\n+# Load procedures from common libraries.\n+load_lib standard.exp\n+load_lib gcc.exp\n+\n+# Load the language-independent compatibility support procedures.\n+load_lib lto.exp\n+\n+# If LTO has not been enabled, bail.\n+if { ![check_effective_target_lto] } {\n+ return\n+}\n+\n+gcc_init\n+lto_init no-mathlib\n+\n+# Define an identifier for use with this suite to avoid name conflicts\n+# with other lto tests running at the same time.\n+set sid \"c_lto\"\n+\n+# Main loop.\n+foreach src [lsort [find $srcdir/$subdir *_0.c]] {\n+ # If we're only testing specific files and this isn't one of them, skip it.\n+ if ![runtest_file_p $runtests $src] then {\n+\tcontinue\n+ }\n+\n+ lto-execute $src $sid\n+}\n+\n+lto_finish\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_0.c\nnew file mode 100644\nindex 00000000000..c2819532f3f\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_0.c\n@@ -0,0 +1,18 @@\n+/* PR target/124365 */\n+/* { dg-lto-do link } */\n+/* { dg-skip-if \"\" { ! aarch64*-*-linux* } } */\n+/* { dg-require-effective-target aarch64_gas_has_build_attributes } */\n+/* { dg-require-effective-target mbranch_protection_ok } */\n+/* { dg-lto-options { { -flto -O2 -mbranch-protection=standard } } } */\n+/* { dg-extra-ld-options \"-nostdlib -nostartfiles -Wl,-e,main\" } */\n+\n+int foo ();\n+int\n+main (void)\n+{\n+ return foo ();\n+}\n+\n+/* { dg-final { object-readelf-attributes {Tag_Feature_BTI:\\s+1\\s+\\(0x1\\)} } } */\n+/* { dg-final { object-readelf-attributes {Tag_Feature_PAC:\\s+1\\s+\\(0x1\\)} } } */\n+/* { dg-final { object-readelf-attributes {Tag_Feature_GCS:\\s+1\\s+\\(0x1\\)} } } */\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_1.c\nnew file mode 100644\nindex 00000000000..8f8b1830bac\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-1_1.c\n@@ -0,0 +1,5 @@\n+int\n+foo ()\n+{\n+ return 0;\n+}\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_0.c\nnew file mode 100644\nindex 00000000000..091ecc83637\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_0.c\n@@ -0,0 +1,18 @@\n+/* PR target/124365 */\n+/* { dg-lto-do link } */\n+/* { dg-skip-if \"\" { ! aarch64*-*-linux* } } */\n+/* { dg-require-effective-target aarch64_gas_has_build_attributes } */\n+/* { dg-require-effective-target mbranch_protection_ok } */\n+/* { dg-lto-options { { -flto -O2 -mbranch-protection=none } } } */\n+/* { dg-extra-ld-options \"-nostdlib -nostartfiles -Wl,-e,main\" } */\n+\n+int foo ();\n+int\n+main (void)\n+{\n+ return foo ();\n+}\n+\n+/* { dg-final { object-readelf-attributes {Tag_Feature_BTI:\\s+0\\s+\\(0x0\\)} } } */\n+/* { dg-final { object-readelf-attributes {Tag_Feature_PAC:\\s+0\\s+\\(0x0\\)} } } */\n+/* { dg-final { object-readelf-attributes {Tag_Feature_GCS:\\s+0\\s+\\(0x0\\)} } } */\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_1.c\nnew file mode 100644\nindex 00000000000..15f7c94dccb\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-2_1.c\n@@ -0,0 +1,6 @@\n+/* { dg-options \"-O2 -flto -mbranch-protection=standard\" } */\n+int\n+foo ()\n+{\n+ return 0;\n+}\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_0.c\nnew file mode 100644\nindex 00000000000..fca83daa0c8\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_0.c\n@@ -0,0 +1,16 @@\n+/* PR target/124365 */\n+/* { dg-lto-do link } */\n+/* { dg-skip-if \"\" { ! aarch64*-*-linux* } } */\n+/* { dg-skip-if \"\" { aarch64_gas_has_build_attributes } } */\n+/* { dg-require-effective-target mbranch_protection_ok } */\n+/* { dg-lto-options { { -flto -O2 -mbranch-protection=standard } } } */\n+/* { dg-extra-ld-options \"-nostdlib -nostartfiles -Wl,-e,main\" } */\n+\n+int foo ();\n+int\n+main (void)\n+{\n+ return 0;\n+}\n+\n+/* { dg-final { object-readelf-notes {AArch64 feature:\\s+BTI,\\s+PAC,\\s+(GCS|<unknown:\\s+[0-9]+>)} } } */\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_1.c\nnew file mode 100644\nindex 00000000000..8f8b1830bac\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_1.c\n@@ -0,0 +1,5 @@\n+int\n+foo ()\n+{\n+ return 0;\n+}\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_0.c\nnew file mode 100644\nindex 00000000000..728ad8e1ea1\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_0.c\n@@ -0,0 +1,16 @@\n+/* PR target/124365 */\n+/* { dg-lto-do link } */\n+/* { dg-skip-if \"\" { ! aarch64*-*-linux* } } */\n+/* { dg-skip-if \"\" { aarch64_gas_has_build_attributes } } */\n+/* { dg-require-effective-target mbranch_protection_ok } */\n+/* { dg-lto-options { { -flto -O2 -mbranch-protection=none } } } */\n+/* { dg-extra-ld-options \"-nostdlib -nostartfiles -Wl,-e,main\" } */\n+\n+int foo ();\n+int\n+main (void)\n+{\n+ return 0;\n+}\n+\n+/* { dg-final { object-readelf-notes-not {AArch64 feature:\\s+BTI\\s+PAC\\s+(GCS|<unknown:\\s+[0-9]+>)} } } */\ndiff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_1.c\nnew file mode 100644\nindex 00000000000..15f7c94dccb\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_1.c\n@@ -0,0 +1,6 @@\n+/* { dg-options \"-O2 -flto -mbranch-protection=standard\" } */\n+int\n+foo ()\n+{\n+ return 0;\n+}\n", "prefixes": [ "2/2" ] }