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From: "Mark Moriarty" <mfmori AT hotmail DOT com>
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Subject: Problem with unistd.h
Date: Tue, 17 Apr 2007 07:13:34 -0400
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Apologies in advance if this is the wrong ML -- I've poked about a fair
amount on the Web, couldn't seem to find a match to this question.

I'm running Cygwin on WinXP, current packages.  I have autoconf 2.61, gcc
and g++ 3.4.4-3, mingw-runtime 3.12-4.

I can see that C:\cygwin\usr\i686-pc-mingw32\include points back to
C:\cygwin\usr\include\mingw

When autoconf is run it detects unistd.h, then in later tests that use it
(have an #include <unistd.h>), the tests consistently error out:
 
In file included from conftest.c:56:
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h:37: error: parse error before "off_t"
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h:38: error: parse error before "off_t"
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h: In function `ftruncate':
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h:40: error: `__fd' undeclared (first use in this function)
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h:40: error: (Each undeclared identifier is reported only once
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h:40: error: for each function it appears in.)
/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include/unist
d.h:40: error: `__length' undeclared (first use in this function)

The unistd.h contents, lines 37 - 41, are:
int ftruncate(int, off_t);
__CRT_INLINE int ftruncate(int __fd, off_t __length)
{
  return _chsize (__fd, __length);
}

Has anyone run into this?  Suggestions?  I've tried many reinstalls of the
Cygwin packages, includeing full kill-and-fill, using different sites, and
keep running into this problem.

Thank you.


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