Hello Liu,
Thursday, June 22, 2017, 4:46:33 AM, you wrote:
>>> So, I need to printf() uint64_t in my project, which is built in strict
>>> ISO C11 mode and with all warnings enabled.
>>
>>> If I try to use "%llu" I get warning that "unknown conversion type
>>> character 'l' in format". If I use "%I64u" I get "ISO C does not support
>>> the 'I64' ms_printf length modifier" warning.
>> And, yes, I have _POSIX_C_SOURCE defined on compiler's command line.
>>
> In order to get C99 conforming `*printf()` functions you have to
> `#define __USE_MINGW_ANSI_STDIO 1` before inclusion of any standard
> headers. One preferable way to achieve that is adding
> `-D__USE_MINGW_ANSI_STDIO` into your CPPFLAGS.
I've started to prepare minimal example for my problem and found one more
ingridient for my problem:" custom function with prinrf attribute. These
defines work for system *printf() family, but not for custom ones.
Here is very simple example of exactly my problem:
==============
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
__attribute__ ((format (printf, 1, 2)))
void myprintf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
}
int main(int argc, char *argv[]) {
uint64_t i = 10;
size_t s = 20;
(void)argc; (void)argv;
printf("%llu %zu\n", i, s);
myprintf("%llu %zu\n", i, s);
return 0;
}
==============
lev@lion MINGW64 ~
$ gcc -D_POSIX_C_SOURCE=1 test.c
lev@lion MINGW64 ~
$ ./a.exe
10 20
10 20
lev@lion MINGW64 ~
$ gcc -D_POSIX_C_SOURCE=1 -std=c11 -Wall -Wextra -Wpedantic -Wformat=2 -Werror
test.c
test.c: In function 'main':
test.c:17:15: error: unknown conversion type character 'l' in format
[-Werror=format=]
myprintf("%llu %zu\n", i, s);
^
test.c:17:19: error: unknown conversion type character 'z' in format
[-Werror=format=]
myprintf("%llu %zu\n", i, s);
^
test.c:17:12: error: too many arguments for format [-Werror=format-extra-args]
myprintf("%llu %zu\n", i, s);
^~~~~~~~~~~~
cc1.exe: all warnings being treated as errors
lev@lion MINGW64 ~
$
--
Best regards,
Lev mailto:[email protected]
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Mingw-w64-public mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
