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Date: Tue, 05 May 2009 05:27:58 +0100
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: problems using Xlib.h/Xwindows.h/unistd.h and win32api under  gcc-4
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Chris LeBlanc wrote:

>> gcc-4 test_sleep.c -Wall -lX11 -lcomdlg32 -o test_sleep
> In file included from /usr/include/unistd.h:4,
>                  from test_sleep.c:4:
> /usr/include/sys/unistd.h:144: error: expected declaration specifiers
> or '...' before '(' token
> /usr/include/sys/unistd.h:144: error: conflicting types for 'Sleep'
> /usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../../include/w32api/winbase.h:1984:
> error: previous declaration of 'Sleep' was here

  Argh.  Someone somewher has done "#define sleep Sleep" and it's messing over
the definition of sleep() in unistd.h making it conflict with Sleep() from
winbase.h.  No, hang on, it's even worserer than that:

# 69 "/usr/include/X11/Xwindows.h" 3 4
#define sleep(x) Sleep((x) * 1000)

... leading to this nonsensical declaration:

unsigned __attribute__((__cdecl__)) Sleep((unsigned int __seconds) * 1000);

  Ok, so you can work around that with careful ordering, as long as you don't
want the unistd version of sleep.  Try it like this:

admin AT ubik /tmp/x
$ cat test-x.c
#include <stdio.h>
#include <unistd.h>
#include <X11/Xwindows.h>
#include <windows.h>

int main() {
    printf("Hello\n");
    return 0;
}

admin AT ubik /tmp/x
$ gcc-4 test-x.c  -Wall -lX11 -lcomdlg32 -o test-x.exe --save-temps

admin AT ubik /tmp/x
$ ./test-x.exe
Hello

admin AT ubik /tmp/x
$

    cheers,
      DaveK


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