Is this a Wine bug, or a Windows bug?

Keith Marshall <[email protected]> Wed, 13 May 2020 14:16:44 +0100

Newsgroups	gmane.comp.gnu.mingw.user
Organization	MinGW.org Project
Message-ID	<[email protected]>

I suspect that it's probably the former, but I no longer have ready
access to a Windows host, on which to test.  The following toy program:

  #include <time.h>
  #include <stdio.h>

  #ifdef _WIN32
  #define localtime _localtime64
  #endif

  int main()
  {
    struct timespec now;
    if( clock_gettime( CLOCK_REALTIME, &now ) == 0 )
    {
      char buf[64];
      if( strftime( buf, sizeof buf, "%Y-%m-%d %H:%M %z",
          localtime( &now.tv_sec ) )
        != 0 )
          printf( "%s\n", buf );
    }
    return 0;
  }

when cross-compiled, and run under wine-5.7, results in output which is
similar to:

  $ mingw32-gcc foo.c
  $ ./a.exe
  2020-05-13 13:46 GMT Daylight Time

whereas the expected, and correct[1], output would be similar to:

  $ gcc foo.c
  $ ./a.out
  2020-05-13 13:46 +0100

[1]:
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/strftime-wcsftime-strftime-l-wcsftime-l?view=vs-2019
says that the "%z" format spec represents the ISO-8601 timezone offset
from UTC, which is exactly what the a.out build displays; the output of
"GMT Daylight Time" would be okay for "%Z", (and indeed that's just what
"%Z" yields too), but it's not correct for "%z".

-- 
Regards,
Keith.

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