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Date:	Mon, 23 Mar 2009 15:23:02 +0000
From:	Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: PING: Deprecation of -mno-cygwin.
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Steve Thompson wrote:
> On Mon, 23 Mar 2009, Dave Korn wrote:
> 
>> It's a bit of a kludge compared to having a real honest-to-god 
>> cross-compiler. It's never worked entirely right in terms of keeping 
>> cygwin and mingw headers and libs completely separate. A full-blown mingw
>> cross-compiler won't cost that much in terms of disk space and the 
>> reliability and correctness improvements will be worth it.

> That's very interesting. I've been using -mno-cygwin for several years,
> having done many many thousands of compiles and links using it, and I
> have never had a problem with either headers or libraries! 

  Just for example:

$ gcc-3 -print-search-dirs

libraries: =/usr/lib/gcc/i686-pc-cygwin/3.4.4/:/usr/lib/gcc/i686-pc-cygwin/3.4.4
/:/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/i686-pc-cygwi
n/3.4.4/:/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/:/usr/
lib/gcc/i686-pc-cygwin/3.4.4/../../../i686-pc-cygwin/3.4.4/:/usr/lib/gcc/i686-pc
-cygwin/3.4.4/../../../:/lib/i686-pc-cygwin/3.4.4/:/lib/:/usr/lib/i686-pc-cygwin
/3.4.4/:/usr/lib/

$ gcc-3 -mno-cygwin -print-search-dirs
libraries: =/usr/lib/gcc/i686-pc-mingw32/3.4.4/:/usr/lib/gcc/i686-pc-mingw32/3.4
.4/:/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/lib/i686-pc-m
ingw32/3.4.4/:/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/lib
/:/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../i686-pc-mingw32/3.4.4/:/usr/lib/gc
c/i686-pc-mingw32/3.4.4/../../../:/lib/i686-pc-mingw32/3.4.4/:/lib/:/usr/lib/i68
6-pc-mingw32/3.4.4/:/usr/lib/

$ gcc-3 -v  -E - </dev/null

ignoring nonexistent directory "/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/include
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/include
 /usr/include
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/../include/w32
api
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/../../include/
w32api
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "<stdin>"

DKAdmin AT ubik ~
$ gcc-3 -v -mno-cygwin  -E - </dev/null

ignoring nonexistent directory "/usr/local/include/mingw"
ignoring duplicate directory "/usr/include/mingw"
ignoring duplicate directory
"/usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/lib/../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i686-pc-cygwin/3.4.4/include
 /usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../i686-pc-mingw32/include
 /usr/lib/gcc/i686-pc-mingw32/3.4.4/../../../../include/w32api
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "<stdin>"

> Is there a recommended alternative?

  As the others have said, a full-blown cross-compiler will DTRT everywhere.

    cheers,
      DaveK

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