On Dec 21 2006 15:40, Joe Perches wrote:
>On Fri, 2006-12-22 at 00:29 +0100, Jan Engelhardt wrote:
>> On Dec 21 2006 14:53, Joe Perches wrote:
>> >On Thu, 2006-12-21 at 21:52 +0100, Jan Engelhardt wrote:
>> >> http://lkml.org/lkml/2006/9/30/208
>> >@@ -1302,7 +1302,7 @@ static int acpi_battery_add(struct acpi_
>> > battery->init_state = 1;
>> > }
>> >- (void)sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
>> >+ sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
>> >These casts can eliminate "return value unused" warnings.
>>
>> But only when functions are tagged __must_check, and sprintf is not.
>
>or where -Wall is used.
00:50 takeshi:/dev/shm > cat bla.c
#include <stdio.h>
int main(void) {
char foo[42];
sprintf(foo, "bar");
return 0;
}
00:52 takeshi:/dev/shm > cc bla.c -Wall
(no warnings)
In case you were talking about kernel code, the same (i.e. no warnings)
happens:
00:54 takeshi:/dev/shm > make -C /lib/modules/2.6.18.5-jen40b-default/build
M=$PWD
make: Entering directory `/usr/src/linux-2.6.18.5-jen40b-obj/i386/default'
make -C ../../../linux-2.6.18.5-jen40b
O=../linux-2.6.18.5-jen40b-obj/i386/default
CC [M] /dev/shm/bla2.o
Building modules, stage 2.
MODPOST
LD [M] /dev/shm/bla2.ko
make: Leaving directory `/usr/src/linux-2.6.18.5-jen40b-obj/i386/default'
00:54 takeshi:/dev/shm > cat Makefile
EXTRA_CFLAGS += -Wall
obj-m += bla2.o
-`J'
--
-
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