[Mingw-notify] [ mingw-Bugs-2818436 ] GCC 4.4.0 "unknown conversion type character 'l' in format"

Bugs item #2818436, was opened at 2009-07-08 09:50
Message generated for change (Settings changed) made by keithmarshall
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Category: gcc
>Group: Behaves as Documented
>Status: Closed
>Resolution: Invalid
Priority: 5
Private: No
Submitted By: Steven Van Ingelgem (g00fy)
Assigned to: Nobody/Anonymous (nobody)
Summary: GCC 4.4.0 "unknown conversion type character 'l' in format"

Initial Comment:
When compiling:

#include <stdio.h>
int main( int argc, char*argv[] ) {
 unsigned long long i;
 sscanf(argv[1], "%llu", &i);
 printf("%llu", i);
 return 0
}

I get this warnings:
C:\tmp>g++ tst.cpp
tst.cpp: In function 'int main(int, char**)':
tst.cpp:7: error: expected ';' before '}' token

C:\tmp>g++ -Wall tst.cpp
tst.cpp: In function 'int main(int, char**)':
tst.cpp:4: warning: unknown conversion type character 'l' in format
tst.cpp:4: warning: too many arguments for format
tst.cpp:5: warning: unknown conversion type character 'l' in format
tst.cpp:5: warning: too many arguments for format

C:\tmp>a 16409049846434354
2738014770
C:\tmp>


As you can see, it interprets the unsigned long long as a 32 integer, and not 64 bit one...


Grtz,
Steven

----------------------------------------------------------------------

>Comment By: Keith Marshall (keithmarshall)
Date: 2009-07-09 12:34

Message:
> As you can see, it interprets the unsigned long long as a 32 integer,
> and not 64 bit one...

Which is exactly as you should expect, when you use the standard Microsoft
implementations of printf, scanf and friends, (as MinGW does).

If you are using mingwrt-3.15 or later, it provides an alternative
implementation of printf and friends, (but not scanf and friends), which
does accept ISO-C99 format specifiers; however, for truly portable code,
you should learn to use inttypes.h to formulate portable format
specification strings.

----------------------------------------------------------------------

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