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* [Bug middle-end/105316] New: Seemingly bogus -Wdangling-pointer from ppc/ppc64 kernel printk with gcc12
@ 2022-04-20 3:24 raj.khem at gmail dot com
2022-04-20 3:29 ` [Bug middle-end/105316] " pinskia at gcc dot gnu.org
2022-04-20 3:35 ` raj.khem at gmail dot com
0 siblings, 2 replies; 3+ messages in thread
From: raj.khem at gmail dot com @ 2022-04-20 3:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105316
Bug ID: 105316
Summary: Seemingly bogus -Wdangling-pointer from ppc/ppc64
kernel printk with gcc12
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: raj.khem at gmail dot com
Target Milestone: ---
I have reduced this case from ppc kernel 5.15, this breaks the kernel build as
the warning is treated as error.
ftrace.i
======================
int _printk(const char *fmt, ...);
static void ftrace_modify_code() {
_printk("replaced (%s)", ({ char __str[sizeof("00000000 00000000")]; __str;
}));
}
=====================
powerpc64le-yoe-linux-musl-gcc -c ftrace.i -Werror=dangling-pointer
ftrace.i: In function 'ftrace_modify_code':
ftrace.i:4:2: error: using a dangling pointer to '__str'
[-Werror=dangling-pointer=]
4 | _printk("replaced (%s)", ({ char __str[sizeof("00000000 00000000")];
__str; }));
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ftrace.i:4:35: note: '__str' declared here
4 | _printk("replaced (%s)", ({ char __str[sizeof("00000000 00000000")];
__str; }));
| ^~~~~
cc1: some warnings being treated as errors
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/105316] Seemingly bogus -Wdangling-pointer from ppc/ppc64 kernel printk with gcc12
2022-04-20 3:24 [Bug middle-end/105316] New: Seemingly bogus -Wdangling-pointer from ppc/ppc64 kernel printk with gcc12 raj.khem at gmail dot com
@ 2022-04-20 3:29 ` pinskia at gcc dot gnu.org
2022-04-20 3:35 ` raj.khem at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-04-20 3:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105316
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The warning is correct __str goes out of the scope when the statement
expression ends.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/105316] Seemingly bogus -Wdangling-pointer from ppc/ppc64 kernel printk with gcc12
2022-04-20 3:24 [Bug middle-end/105316] New: Seemingly bogus -Wdangling-pointer from ppc/ppc64 kernel printk with gcc12 raj.khem at gmail dot com
2022-04-20 3:29 ` [Bug middle-end/105316] " pinskia at gcc dot gnu.org
@ 2022-04-20 3:35 ` raj.khem at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: raj.khem at gmail dot com @ 2022-04-20 3:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105316
--- Comment #2 from Khem Raj <raj.khem at gmail dot com> ---
ah yes. Thanks
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-04-20 3:35 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-04-20 3:24 [Bug middle-end/105316] New: Seemingly bogus -Wdangling-pointer from ppc/ppc64 kernel printk with gcc12 raj.khem at gmail dot com
2022-04-20 3:29 ` [Bug middle-end/105316] " pinskia at gcc dot gnu.org
2022-04-20 3:35 ` raj.khem at gmail dot com
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