Re: bug in lrint [was: FW: Printing long int in C program under cygwin64]

[Steven Penny <svnpenn at gmail dot com>]

On Thu, 25 May 2017 18:43:58, Steven Penny wrote:
> Uh, have you actually tried this? It doesnt do anything:
>
>     $ cat alfa.c
>     #define __USE_MINGW_ANSI_STDIO 1
>     #include <stdio.h>
>     int main() {
>       printf("%zi %zu %llu\n", __SIZE_MAX__, __SIZE_MAX__, __SIZE_MAX__);
>     }
>
>     $ x86_64-w64-mingw32-gcc -Wformat-signedness -o alfa alfa.c

Correcting myself: you need 2 flags to get this working:

   $ x86_64-w64-mingw32-gcc -Wformat -Wformat-signedness alfa.c
   alfa.c: In function ‘main’:
   alfa.c:11:10: warning: format ‘%zi’ expects argument of type
   ‘signed size_t’, but argument 2 has type ‘long long unsigned int’
   [-Wformat=]
      printf("%zi %zu %llu\n", __SIZE_MAX__, __SIZE_MAX__, __SIZE_MAX__);
             ^


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