[{"id":3675967,"web_url":"http://patchwork.ozlabs.org/comment/3675967/","msgid":"","list_archive_url":null,"date":"2026-04-10T16:15:39","subject":"Re: [PATCH] AArch64: Deprecate -mpc-relative-literal-loads","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Fri, Apr 10, 2026 at 7:25 AM Wilco Dijkstra wrote:\n>\n>\n> Deprecate -mpc-relative-literal-loads. Emitting special symbols in\n> the text section causes issues (see PR123791). Since the option is\n> relatively obscure and GCC now uses anchors for literals, there is\n> no need to keep it.\n>\n> Passes regress, OK for commit?\n\nOk from my point of view, make sure you add a notice to\ngcc-16/changes.html about the deprecation.\n\nThanks,\nAndrew Pinski\n\n>\n> gcc:\n> * config/aarch64/aarch64.opt (mpc-relative-literal-loads):\n> Deprecate.\n> * config/aarch64/aarch64.cc (aarch64_override_options):\n> Add deprecated warning for -mpc-relative-literal-loads.\n> * doc/invoke.texi (mpc-relative-literal-loads): Update docs.\n>\n> gcc/testsuite:\n> * gcc.target/aarch64/pr123791.c: Add -Wno-deprecated.\n> * gcc.target/aarch64/pr78733.c: Likewise.\n> * gcc.target/aarch64/pr79041-2.c: Likewise.\n> * gcc.target/aarch64/pr94530.c: Likewise.\n>\n> ---\n>\n> diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc\n> index f5285ed45962f3fe795348cc77534b3dfa010b52..754155086ed52b37bd62ec437994a24ff0d80afd 100644\n> --- a/gcc/config/aarch64/aarch64.cc\n> +++ b/gcc/config/aarch64/aarch64.cc\n> @@ -20108,6 +20108,9 @@ aarch64_override_options (void)\n> if (TARGET_ILP32)\n> warning (OPT_Wdeprecated, \"%<-mabi=ilp32%> is deprecated\");\n>\n> + if (global_options.x_pcrelative_literal_loads == 1)\n> + warning (OPT_Wdeprecated, \"%<-mpc-relative-literal-loads%> is deprecated\");\n> +\n> /* Convert -msve-vector-bits to a VG count. */\n> aarch64_sve_vg = aarch64_convert_sve_vector_bits (aarch64_sve_vector_bits);\n>\n> diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt\n> index 9b59c15737f924ca3bf4a1d547f3a731801667dd..a983ec8acedb28bc02a6afad86d24fedd9cbd85f 100644\n> --- a/gcc/config/aarch64/aarch64.opt\n> +++ b/gcc/config/aarch64/aarch64.opt\n> @@ -217,7 +217,7 @@ Enum(aarch64_abi) String(lp64) Value(AARCH64_ABI_LP64)\n>\n> mpc-relative-literal-loads\n> Target Save Var(pcrelative_literal_loads) Init(2) Save\n> -PC relative literal loads.\n> +PC relative literal loads. This option is deprecated.\n>\n> mbranch-protection=\n> Target RejectNegative Joined Var(aarch64_branch_protection_string) Save\n> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi\n> index 58254b82b0e089a56e2030f83d2eed3c1bcf3e98..8f95b1f54ca25c1cae508125c8ad4909bae1be9e 100644\n> --- a/gcc/doc/invoke.texi\n> +++ b/gcc/doc/invoke.texi\n> @@ -23347,6 +23347,8 @@ accessed using a single instruction and emitted after each function. This\n> limits the maximum size of functions to 1MB. This is enabled by default for\n> @option{-mcmodel=tiny}.\n>\n> +The @option{-mpc-relative-literal-loads} is deprecated.\n> +\n> @opindex msign-return-address\n> @item -msign-return-address=@var{scope}\n> Select the function scope on which return address signing will be applied.\n> diff --git a/gcc/testsuite/gcc.target/aarch64/pr123791.c b/gcc/testsuite/gcc.target/aarch64/pr123791.c\n> index afdf37e8aac1a6451bb1375a32ab68f81b32b36c..8e394231a4a02dbb5bc1ad2a50775976c349593b 100644\n> --- a/gcc/testsuite/gcc.target/aarch64/pr123791.c\n> +++ b/gcc/testsuite/gcc.target/aarch64/pr123791.c\n> @@ -1,5 +1,5 @@\n> /* { dg-do compile } */\n> -/* { dg-options \"-O2 -mpc-relative-literal-loads\" } */\n> +/* { dg-options \"-O2 -mpc-relative-literal-loads -Wno-deprecated\" } */\n>\n> char *\n> foo ()\n> diff --git a/gcc/testsuite/gcc.target/aarch64/pr78733.c b/gcc/testsuite/gcc.target/aarch64/pr78733.c\n> index 8556ef3f37187f0bf52d7113ab011bf0f8be2b84..9de6fb6dc1ae3d7690ca41c9871a835eb4212476 100644\n> --- a/gcc/testsuite/gcc.target/aarch64/pr78733.c\n> +++ b/gcc/testsuite/gcc.target/aarch64/pr78733.c\n> @@ -1,5 +1,5 @@\n> /* { dg-do compile } */\n> -/* { dg-options \"-O2 -mcmodel=large -mpc-relative-literal-loads -fno-pie\" } */\n> +/* { dg-options \"-O2 -mcmodel=large -mpc-relative-literal-loads -fno-pie -Wno-deprecated\" } */\n> /* { dg-require-effective-target lp64 } */\n> /* { dg-skip-if \"-mcmodel=large, no support for -fpic\" { aarch64-*-* } { \"-fpic\" } { \"\" } } */\n>\n> diff --git a/gcc/testsuite/gcc.target/aarch64/pr79041-2.c b/gcc/testsuite/gcc.target/aarch64/pr79041-2.c\n> index 8556ef3f37187f0bf52d7113ab011bf0f8be2b84..9de6fb6dc1ae3d7690ca41c9871a835eb4212476 100644\n> --- a/gcc/testsuite/gcc.target/aarch64/pr79041-2.c\n> +++ b/gcc/testsuite/gcc.target/aarch64/pr79041-2.c\n> @@ -1,5 +1,5 @@\n> /* { dg-do compile } */\n> -/* { dg-options \"-O2 -mcmodel=large -mpc-relative-literal-loads -fno-pie\" } */\n> +/* { dg-options \"-O2 -mcmodel=large -mpc-relative-literal-loads -fno-pie -Wno-deprecated\" } */\n> /* { dg-require-effective-target lp64 } */\n> /* { dg-skip-if \"-mcmodel=large, no support for -fpic\" { aarch64-*-* } { \"-fpic\" } { \"\" } } */\n>\n> diff --git a/gcc/testsuite/gcc.target/aarch64/pr94530.c b/gcc/testsuite/gcc.target/aarch64/pr94530.c\n> index 5dfdbe3311d741349c46b4ce3ad3f5819063f894..9620b63769dbc92c30ebeb9aab9cd6579b012410 100644\n> --- a/gcc/testsuite/gcc.target/aarch64/pr94530.c\n> +++ b/gcc/testsuite/gcc.target/aarch64/pr94530.c\n> @@ -1,6 +1,6 @@\n> /* { dg-do compile } */\n> /* { dg-require-effective-target lp64 } */\n> -/* { dg-options \"-Os -mcpu=falkor -mpc-relative-literal-loads -mcmodel=large -fno-pie\" } */\n> +/* { dg-options \"-Os -mcpu=falkor -mpc-relative-literal-loads -mcmodel=large -fno-pie -Wno-deprecated\" } */\n>\n> extern void bar(const char *);\n>\n>\n>\n>","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 (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=fwv5z1Wu;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=Kk5Lww4w;\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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