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Sat, 12 Jul 2025 13:16:46 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id Vf8rOD5gcmiJNgAAD6G6ig (envelope-from ) for ; Sat, 12 Jul 2025 13:16:46 +0000 From: Tom de Vries To: gdb-patches@sourceware.org Subject: [PATCH] [gdb/build] Work around GCC ipa-modref bug Date: Sat, 12 Jul 2025 15:16:49 +0200 Message-ID: <20250712131649.8372-1-tdevries@suse.de> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[sourceware.org:url,gnu.org:url,imap1.dmz-prg2.suse.org:helo,suse.de:mid]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[gdb-patches@sourceware.org]; RCVD_TLS_ALL(0.00)[] X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org PR mi/32571 reports the following problem: ... $ gdb -q -batch -ex "b bla.c:100" Make breakpoint pending on future shared library load? (y or [n]) \ [answered N; input not from terminal] ... while this is expected: ... $ gdb -q -batch -ex "b bla.c:100" No symbol table is loaded. Use the "file" command. Make breakpoint pending on future shared library load? (y or [n]) \ [answered N; input not from terminal] ... A few factors in reproducing this are building gdb using gcc 14, "-O2 -flto=auto" and --disable-nls. For more details, see the PR. This turns out to be caused by a GCC PR [1], more specifically a problem in ipa-modref. Work around this by disabling ipa-modref for GCC versions 12-15 and 16.0, assuming the GCC 16.1 release will contain a fix. Tested on aarch64-linux and x86_64-linux. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32571 [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120987 --- gdbsupport/common-defs.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/gdbsupport/common-defs.h b/gdbsupport/common-defs.h index 07caf3bd7e4..bdf04d9ec09 100644 --- a/gdbsupport/common-defs.h +++ b/gdbsupport/common-defs.h @@ -27,6 +27,14 @@ #pragma GCC optimize("-fno-hoist-adjacent-loads") #endif +#if defined (__GNUC__) && !defined (__clang__) \ + && ((__GNUC__ >= 12 && __GNUC__ <= 15) \ + || (__GNUC__ == 16 && __GNUC_MINOR__ < 1)) +/* Work around PR gcc/110799 starting gcc 12, and assume it will be fixed in + the gcc 16.1 release. */ +#pragma GCC optimize("-fno-ipa-modref") +#endif + #include #undef PACKAGE_NAME base-commit: 6ab3f09a682adcb4e841faf7fc19dea2671debed -- 2.43.0