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[gdb/build] Work around GCC ipa-modref bug

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PR mi/32571 reports the following problem:
...
$ gdb -q -batch -ex "b bla.c:100"
<random output>
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.

Approved-By: Andrew Burgess <aburgess@redhat.com>

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32571

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120987
This commit is contained in:
Tom de Vries
2025-07-13 07:25:43 +02:00
parent 5ad9c520cb
commit 0e8dbf5c5d
1 changed files with 8 additions and 0 deletions
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8
gdbsupport/common-defs.h
View File

@@ -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/120987 starting gcc 12, and assume it will be fixed in
the gcc 16.1 release. */
#pragma GCC optimize("-fno-ipa-modref")
#endif
#include <gdbsupport/config.h>
#undef PACKAGE_NAME