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GET /api/patches/2218167/?format=api
{ "id": 2218167, "url": "http://patchwork.ozlabs.org/api/patches/2218167/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/acvYsKyCnFROe-xu@arm.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<acvYsKyCnFROe-xu@arm.com>", "list_archive_url": null, "date": "2026-03-31T14:22:40", "name": "[3/4] aarch64: Implement TARGET_STRONG_AFFECTS_TYPE_IDENTITY_P [PR122483]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "686530cf49d1277a1f988dc8418370f6c6e71eb8", "submitter": { "id": 79039, "url": "http://patchwork.ozlabs.org/api/people/79039/?format=api", "name": "Alex Coplan", "email": "Alex.Coplan@arm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/acvYsKyCnFROe-xu@arm.com/mbox/", "series": [ { "id": 498209, "url": "http://patchwork.ozlabs.org/api/series/498209/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=498209", "date": "2026-03-31T14:20:57", "name": "aarch64, c-family: Stronger type checking for target attrs [PR122483]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498209/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218167/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2218167/checks/", "tags": {}, "related": [], "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=RuMAEL6y;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=RuMAEL6y;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n AM3PEPF0000A796.eurprd04.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": "This implements the hook added by the previous patch on aarch64, thereby\nfixing this P1 regression.\n\nAt first I thought we might only want this behaviour for e.g. the\n[[arm::streaming]] attribute, but thinking about it more it seems the\nmost consistent/defensible approach is to reject code such as:\n\n void f(void) A;\n void f(void);\n\nfor any attribute A that affects the PCS/ABI of f, which on aarch64 is\nthose that have affects_type_identity set.\n\nBootstrapped/regtested as a series on aarch64-linux-gnu (with and\nwithout the final C++ patch), OK for trunk?\n\nThanks,\nAlex\n\ngcc/ChangeLog:\n\n\tPR target/122483\n\t* config/aarch64/aarch64.cc (aarch64_strong_affects_type_identity_p): New.\n\t(TARGET_STRONG_AFFECTS_TYPE_IDENTITY_P): New.\n\ngcc/testsuite/ChangeLog:\n\n\tPR target/122483\n\t* gcc.target/aarch64/pr122483.c: New test.\n---\n gcc/config/aarch64/aarch64.cc | 21 +++++++++++++++++++++\n gcc/testsuite/gcc.target/aarch64/pr122483.c | 8 ++++++++\n 2 files changed, 29 insertions(+)\n create mode 100644 gcc/testsuite/gcc.target/aarch64/pr122483.c", "diff": "diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc\nindex 197d4f27269..34b0be4f443 100644\n--- a/gcc/config/aarch64/aarch64.cc\n+++ b/gcc/config/aarch64/aarch64.cc\n@@ -31086,6 +31086,23 @@ aarch64_merge_decl_attributes (tree olddecl, tree newdecl)\n return merge_attributes (old_attrs, new_attrs);\n }\n \n+/* Implement TARGET_STRONG_AFFECTS_TYPE_IDENTITY_P. This prevents the\n+ front-end from merging two declarations such as:\n+\n+ void f(void) A;\n+ void f(void);\n+\n+ for any attribute A which has affects_type_identity set. On AArch64,\n+ affects_type_identity on function type attributes is set when the presence\n+ of the attribute affects the ABI of the function, as with e.g.\n+ [[arm::streaming]] or __attribute__((aarch64_vector_pcs)). */\n+\n+static bool\n+aarch64_strong_affects_type_identity_p ()\n+{\n+ return true;\n+}\n+\n /* Implement TARGET_GET_MULTILIB_ABI_NAME */\n \n static const char *\n@@ -33959,6 +33976,10 @@ aarch64_libgcc_floating_mode_supported_p\n #undef TARGET_MERGE_DECL_ATTRIBUTES\n #define TARGET_MERGE_DECL_ATTRIBUTES aarch64_merge_decl_attributes\n \n+#undef TARGET_STRONG_AFFECTS_TYPE_IDENTITY_P\n+#define TARGET_STRONG_AFFECTS_TYPE_IDENTITY_P \\\n+ aarch64_strong_affects_type_identity_p\n+\n #undef TARGET_GET_MULTILIB_ABI_NAME\n #define TARGET_GET_MULTILIB_ABI_NAME aarch64_get_multilib_abi_name\n \ndiff --git a/gcc/testsuite/gcc.target/aarch64/pr122483.c b/gcc/testsuite/gcc.target/aarch64/pr122483.c\nnew file mode 100644\nindex 00000000000..d039aa28750\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/aarch64/pr122483.c\n@@ -0,0 +1,8 @@\n+/* { dg-do compile } */\n+/* This test defends the behaviour for the non-SME cases of PR122483. */\n+\n+void f1(void) __attribute__((aarch64_vector_pcs));\n+void f1(void); /* { dg-error \"conflicting types\" } */\n+\n+void f2(void) __attribute__((preserve_none));\n+void f2(void); /* { dg-error \"conflicting types\" } */\n", "prefixes": [ "3/4" ] }