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* [Bug c/67854] New: Missing diagnostic for passing bool to va_arg
@ 2015-10-05 17:15 miyuki at gcc dot gnu.org
2015-10-20 8:58 ` [Bug c/67854] " mpolacek at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: miyuki at gcc dot gnu.org @ 2015-10-05 17:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67854
Bug ID: 67854
Summary: Missing diagnostic for passing bool to va_arg
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: miyuki at gcc dot gnu.org
Target Milestone: ---
Consider the following code:
$ cat test.c
#include <stdarg.h>
void foo(va_list ap)
{
va_arg(ap, char);
va_arg(ap, unsigned char);
}
$ cc1 -std=c99 test.c
In file included from test.c:1:0:
test.c: In function 'foo':
test.c:5:16: warning: 'char' is promoted to 'int' when passed through '...'
va_arg(ap, char);
^
test.c:5:16: note: (so you should pass 'int' not 'char' to 'va_arg')
test.c:5:16: note: if this code is reached, the program will abort
test.c:6:16: warning: 'unsigned char' is promoted to 'int' when passed through
'...'
va_arg(ap, unsigned char);
^
test.c:6:16: note: if this code is reached, the program will abort
However:
$ cat test2.c
#include <stdbool.h>
#include <stdarg.h>
void foo(va_list ap)
{
va_arg(ap, bool);
}
$ cc1 -std=c99 -Wall -Wextra test2.c
va_arg(ap, bool) is expanded into __builtin_trap, but no warning is issued.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c/67854] Missing diagnostic for passing bool to va_arg
2015-10-05 17:15 [Bug c/67854] New: Missing diagnostic for passing bool to va_arg miyuki at gcc dot gnu.org
@ 2015-10-20 8:58 ` mpolacek at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-10-20 8:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67854
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-10-20
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-10-05 17:15 [Bug c/67854] New: Missing diagnostic for passing bool to va_arg miyuki at gcc dot gnu.org
2015-10-20 8:58 ` [Bug c/67854] " mpolacek at gcc dot gnu.org
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