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* [Bug c/58959] New: Add warning when format specifiers refers to wrong signess
@ 2013-11-01 10:05 lotharlutz at gmx dot de
2013-11-01 10:08 ` [Bug c/58959] " lotharlutz at gmx dot de
2014-03-25 22:22 ` mpolacek at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: lotharlutz at gmx dot de @ 2013-11-01 10:05 UTC (permalink / raw)
To: gcc-bugs
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58959
Bug ID: 58959
Summary: Add warning when format specifiers refers to wrong
signess
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: lotharlutz at gmx dot de
When using a format specifier that refers to a different sign (signed vs
unsigned) as to corresponding variable has, a warning should be emitted.
Version:
gcc version 4.8.2 20131017 (Red Hat 4.8.2-1) (GCC)
Example:
-----
#include <stdio.h>
int main()
{
short i = -1;
//correct usage
printf("%hd\n",i);
//should yield a warning, but does not
printf("%hu\n",i);
//correctly yields a warning
printf("%ld\n",i);
return 0;
}
----
gcc -Wall -Wextra test.c
test.c: In function ‘main’:
test.c:14:5: warning: format ‘%ld’ expects argument of type ‘long int’, but
argument 2 has type ‘int’ [-Wformat=]
printf("%ld\n",i);
gcc warns when the variable has the wrong size (line 14), but not on the wrong
size (line 11)
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From: "lotharlutz at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/58959] Add warning when format specifiers refers to wrong signess
Date: Fri, 01 Nov 2013 10:07:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 4.8.2
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: lotharlutz at gmx dot de
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX959
--- Comment #1 from Markus Mayer <lotharlutz at gmx dot de> ---
Created attachment 31131
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id1131&actioníit
preprocessed test file
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/58959] Add warning when format specifiers refers to wrong signess
2013-11-01 10:05 [Bug c/58959] New: Add warning when format specifiers refers to wrong signess lotharlutz at gmx dot de
@ 2013-11-01 10:08 ` lotharlutz at gmx dot de
2014-03-25 22:22 ` mpolacek at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: lotharlutz at gmx dot de @ 2013-11-01 10:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58959
--- Comment #2 from Markus Mayer <lotharlutz at gmx dot de> ---
Created attachment 31132
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31132&action=edit
output of 'gcc -v -save-temps -Wall -Wextra test.c'
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c/58959] Add warning when format specifiers refers to wrong signess
2013-11-01 10:05 [Bug c/58959] New: Add warning when format specifiers refers to wrong signess lotharlutz at gmx dot de
2013-11-01 10:08 ` [Bug c/58959] " lotharlutz at gmx dot de
@ 2014-03-25 22:22 ` mpolacek at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2014-03-25 22:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58959
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |mpolacek at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is expected. Shorts and chars are passed as ints due to default
promotions.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-03-25 22:22 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2013-11-01 10:05 [Bug c/58959] New: Add warning when format specifiers refers to wrong signess lotharlutz at gmx dot de
2013-11-01 10:08 ` [Bug c/58959] " lotharlutz at gmx dot de
2014-03-25 22:22 ` mpolacek at gcc dot gnu.org
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