[{"id":3676506,"web_url":"http://patchwork.ozlabs.org/comment/3676506/","msgid":"","list_archive_url":null,"date":"2026-04-13T07:27:53","subject":"RE: [PATCH 2/2] aarch64/testsuite: add LTO coverage for\n branch-protection notes and attributes","submitter":{"id":69689,"url":"http://patchwork.ozlabs.org/api/people/69689/","name":"Tamar Christina","email":"Tamar.Christina@arm.com"},"content":"> -----Original Message-----\n> From: Muhammad Kamran \n> Sent: 08 April 2026 10:12\n> To: gcc-patches@gcc.gnu.org\n> Cc: Richard Earnshaw ; Tamar Christina\n> ; Kyrylo Tkachov ; Alice\n> Carlotti ; Alex Coplan ;\n> Andrew Pinski ; Wilco Dijkstra\n> ; Jakub Jelinek ; Rainer Orth\n> ; Mike Stump ;\n> Muhammad Kamran \n> Subject: [PATCH 2/2] aarch64/testsuite: add LTO coverage for branch-\n> protection notes and attributes\n> \n> Recent binutils (e.g. 2.46) switched AArch64 branch-protection emission\n> from .note.gnu.property to build attributes\n> (Tag_Feature_BTI, Tag_Feature_PAC, Tag_Feature_GCS) when GCC is\n> configured with such toolchains.\n> \n> PR target/124365 exposed an issue where -flto with\n> -mbranch-protection=standard caused loss of branch-protection metadata in\n> build\n> attributes. This was due to an LTO bug, now fixed upstream\n> (8b39ec70741b7fb9d059b6944f30a6743dea996a).\n> \n> Add 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> \n> This ensures branch-protection metadata is preserved across LTO for both\n> toolchain configurations.\n> \n> \tPR target/124365\n> \n> gcc/testsuite/ChangeLog:\n> \n> \t* gcc.target/aarch64/lto/lto.exp: New DejaGnu test driver for LTO\n> tests\n> \tfor aarch64. Copied from gcc/testsuite/gcc.target/arm/lto/lto.exp\n> 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:\n> 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:\n> 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\nOK, once patch 1 is approved.\n\nThanks,\nTamar\n\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-\n> attributes-1_0.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-\n> attributes-1_1.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-\n> attributes-2_0.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-\n> attributes-2_1.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-\n> property-1_0.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-\n> property-1_1.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-\n> property-2_0.c\n> create mode 100644 gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-\n> property-2_1.c\n> \n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/lto.exp\n> b/gcc/testsuite/gcc.target/aarch64/lto/lto.exp\n> new file mode 100644\n> index 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> +# .\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\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 1_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 1_0.c\n> new file mode 100644\n> index 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> */\n> +/* { dg-final { object-readelf-attributes {Tag_Feature_PAC:\\s+1\\s+\\(0x1\\)} } }\n> */\n> +/* { dg-final { object-readelf-attributes {Tag_Feature_GCS:\\s+1\\s+\\(0x1\\)} } }\n> */\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 1_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 1_1.c\n> new file mode 100644\n> index 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> +}\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 2_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 2_0.c\n> new file mode 100644\n> index 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> */\n> +/* { dg-final { object-readelf-attributes {Tag_Feature_PAC:\\s+0\\s+\\(0x0\\)} } }\n> */\n> +/* { dg-final { object-readelf-attributes {Tag_Feature_GCS:\\s+0\\s+\\(0x0\\)} } }\n> */\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 2_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-build-attributes-\n> 2_1.c\n> new file mode 100644\n> index 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> +}\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-\n> 1_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_0.c\n> new file mode 100644\n> index 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\n> feature:\\s+BTI,\\s+PAC,\\s+(GCS|)} } } */\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-\n> 1_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-1_1.c\n> new file mode 100644\n> index 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> +}\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-\n> 2_0.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_0.c\n> new file mode 100644\n> index 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\n> feature:\\s+BTI\\s+PAC\\s+(GCS|)} } } */\n> diff --git a/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-\n> 2_1.c b/gcc/testsuite/gcc.target/aarch64/lto/pr124365-gnu-property-2_1.c\n> new file mode 100644\n> index 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> --\n> 2.43.0","headers":{"Return-Path":"","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 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