[{"id":3675686,"web_url":"http://patchwork.ozlabs.org/comment/3675686/","msgid":"","list_archive_url":null,"date":"2026-04-10T07:06:29","subject":"Re: [PATCH] testsuite: Fix up g++.dg/lto/20091022-2_0.C test\n [PR124828]","submitter":{"id":4338,"url":"http://patchwork.ozlabs.org/api/people/4338/","name":"Richard Biener","email":"rguenther@suse.de"},"content":"On Fri, 10 Apr 2026, Jakub Jelinek wrote:\n\n> Hi!\n> \n> From what I can see, this test was added for PR41791 where we didn't stream\n> in/out the system header flags for LTO. The test isn't perfect, because\n> even when we actually do stream those flags, whether it fails or not depends\n> on the exact decisions of the inliner whether it decides to inline all\n> inline/constexpr functions or not (maybe it would help to use some\n> --params to request inlining as few functions as possible).\n> \n> Anyway, guess at some point we simply started to inline everything that was\n> used and so whether the test stopped failing even if it would use\n> -Wsystem-headers. Now, when not using installed gcc testing, we use\n> libstdc++-v3/scripts/testsuite_flags script which uses -I options rather\n> than -isystem, but the headers still had #pragma GCC system_header pragmas.\n> Except that r15-3859 guarded those pragmas with a macro which isn't defined\n> by default and needs to be defined only when we want to make sure the\n> headers are treated as system headers.\n> And later on the recent changes for C++20 stable string exports started\n> seeing a constexpr (thus implicitly inline for -Winline purposes) being too\n> large for default inlining and so the test started to fail again.\n> \n> The following patch fixes it by making sure the libstdc++ headers are\n> treated as system headers, so the test tests again what it was supposed to\n> test.\n> \n> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?\n\nOK.\n\nThanks,\nRichard.\n\n> 2026-04-10 Jakub Jelinek \n> \n> \tPR lto/124828\n> \t* g++.dg/lto/20091022-2_0.C (_GLIBCXX_SYSHDR): Define before including\n> \t.\n> \n> --- gcc/testsuite/g++.dg/lto/20091022-2_0.C.jj\t2026-03-27 10:17:15.910301758 +0100\n> +++ gcc/testsuite/g++.dg/lto/20091022-2_0.C\t2026-04-09 09:09:30.703737425 +0200\n> @@ -2,6 +2,7 @@\n> // { dg-lto-options {{-O3 -flto -Winline}} }\n> // { dg-skip-if \"requires hosted libstdc++ for string\" { ! hostedlib } }\n> \n> +#define _GLIBCXX_SYSHDR\n> #include \n> \n> int\n> \n> \tJakub\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 (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=Q32EOehL;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=bhQimD9g;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=Q32EOehL;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=bhQimD9g;\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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The test isn't perfect, because\n> even when we actually do stream those flags, whether it fails or not depends\n> on the exact decisions of the inliner whether it decides to inline all\n> inline/constexpr functions or not (maybe it would help to use some\n> --params to request inlining as few functions as possible).\n> \n> Anyway, guess at some point we simply started to inline everything that was\n> used and so whether the test stopped failing even if it would use\n> -Wsystem-headers. Now, when not using installed gcc testing, we use\n> libstdc++-v3/scripts/testsuite_flags script which uses -I options rather\n> than -isystem, but the headers still had #pragma GCC system_header pragmas.\n> Except that r15-3859 guarded those pragmas with a macro which isn't defined\n> by default and needs to be defined only when we want to make sure the\n> headers are treated as system headers.\n> And later on the recent changes for C++20 stable string exports started\n> seeing a constexpr (thus implicitly inline for -Winline purposes) being too\n> large for default inlining and so the test started to fail again.\n> \n> The following patch fixes it by making sure the libstdc++ headers are\n> treated as system headers, so the test tests again what it was supposed to\n> test.\n> \n> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?\n\nOK.\n\n> 2026-04-10 Jakub Jelinek \n> \n> \tPR lto/124828\n> \t* g++.dg/lto/20091022-2_0.C (_GLIBCXX_SYSHDR): Define before including\n> \t.\n> \n> --- gcc/testsuite/g++.dg/lto/20091022-2_0.C.jj\t2026-03-27 10:17:15.910301758 +0100\n> +++ gcc/testsuite/g++.dg/lto/20091022-2_0.C\t2026-04-09 09:09:30.703737425 +0200\n> @@ -2,6 +2,7 @@\n> // { dg-lto-options {{-O3 -flto -Winline}} }\n> // { dg-skip-if \"requires hosted libstdc++ for string\" { ! hostedlib } }\n> \n> +#define _GLIBCXX_SYSHDR\n> #include \n> \n> int\n> \n> \tJakub\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 (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=eCB6vLkC;\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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