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mktime call hangs on Cygwin 1.7.30, Windows 7 32 bit

I use "self-compiled" Git (v2.x) on Cygwin (v1.7.30).
Sometimes Git v2.0.4 hung while performing
  git prune --expire 2.weeks.ago

I have investigated while debugging that `mktime` call hung.
But that was an avoidable bug (skip prune - and all is ok). So, I've not
reported it.

But after updating Git to v2.1.0
  git commit --amend -C HEAD --date=''
hangs, too. And now it is the often used operation by me.
So, I've made a simple example (copied from Git sources) to reproduce
the error.

$ cat cygwin-mktime-bug.c
#include <time.h>
#include <string.h>
#include <stdio.h>

int main(int argc, char **argv)
     struct tm tm;

     memset(&tm, 0, sizeof(tm));
     tm.tm_year = -1;
     tm.tm_mon = -1;
     tm.tm_mday = -1;
     tm.tm_isdst = -1;
     tm.tm_hour = -1;
     tm.tm_min = -1;
     tm.tm_sec = -1;

     time_t temp_time = mktime(&tm);

$ gcc cygwin-mktime-bug.c -o cygwin-mktime-bug -I/usr/include -g
$ ./cygwin-mktime-bug.exe

So, there is a question: how to fix it?
Nota bene: I do not want to use Cygwin x64 (there were no exim when I've tested it).

Alexey Shumkin

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