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From: "fw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/110617] RFE: Add a diagnostic-only variant of nonnull attribute
Date: Tue, 11 Jul 2023 10:29:43 +0000 [thread overview]
Message-ID: <bug-110617-4-n58YRkqg8k@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-110617-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110617
--- Comment #11 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Xi Ruoyao from comment #10)
> But Zack's reason against using __nonnull is __nonnull may cause unwanted
> optimizations to *the user code*.
GCC already offers options to control function call behavior in the presence of
nonnull attributes:
For function calls:
• If the compiler determines that a null pointer is passed in an
argument slot marked as non-null, and the ‘-Wnonnull’ option
is enabled, a warning is issued. *Note Warning Options::.
• The ‘-fisolate-erroneous-paths-attribute’ option can be
specified to have GCC transform calls with null arguments to
non-null functions into traps. *Note Optimize Options::.
• The compiler may also perform optimizations based on the
knowledge that certain function arguments cannot be null.
These optimizations can be disabled by the
‘-fno-delete-null-pointer-checks’ option. *Note Optimize
Options::.
So I don't think we need another way to disable nonnull attributes in installed
glibc headers.
next prev parent reply other threads:[~2023-07-11 10:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-10 18:25 [Bug middle-end/110617] New: " xry111 at gcc dot gnu.org
2023-07-10 18:29 ` [Bug middle-end/110617] " xry111 at gcc dot gnu.org
2023-07-10 18:30 ` pinskia at gcc dot gnu.org
2023-07-10 21:27 ` alx at kernel dot org
2023-07-11 0:36 ` sjames at gcc dot gnu.org
2023-07-11 7:46 ` rguenth at gcc dot gnu.org
2023-07-11 8:34 ` xry111 at gcc dot gnu.org
2023-07-11 8:59 ` alx at kernel dot org
2023-07-11 9:05 ` alx at kernel dot org
2023-07-11 9:10 ` fw at gcc dot gnu.org
2023-07-11 10:01 ` xry111 at gcc dot gnu.org
2023-07-11 10:29 ` fw at gcc dot gnu.org [this message]
2023-07-11 10:30 ` xry111 at gcc dot gnu.org
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