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[143.159.226.75]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b5e8e2747fsm7828271f8f.100.2025.07.12.12.43.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Jul 2025 12:43:34 -0700 (PDT) From: Andrew Burgess To: Tom de Vries , gdb-patches@sourceware.org Subject: Re: [PATCH] [gdb/build] Work around GCC ipa-modref bug In-Reply-To: <20250712131649.8372-1-tdevries@suse.de> References: <20250712131649.8372-1-tdevries@suse.de> Date: Sat, 12 Jul 2025 20:43:33 +0100 Message-ID: <87h5zhmbyy.fsf@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: u6g6AJLUTjAkhFGhNA25CSn_SXPSOXw7z4iqhq1JIh8_1752349416 X-Mimecast-Originator: redhat.com Content-Type: text/plain 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 Tom de Vries writes: > 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. First, massive thanks for tracking this issue down. > > 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. */ Should that not be gcc/120987? Also I notice the target milestone on that gcc bug is set to 13.5, maybe that field is used differently for gcc, but I was expecting to see 16.1 maybe? I know there's limits on what we can do to ensure gcc fix this, but might as well get these fields as correct as possible :) With the comment updated: Approved-By: Andrew Burgess Thanks, Andrew > +#pragma GCC optimize("-fno-ipa-modref") > +#endif > + > #include > > #undef PACKAGE_NAME > > base-commit: 6ab3f09a682adcb4e841faf7fc19dea2671debed > -- > 2.43.0