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Date: Tue, 05 Aug 2008 20:30:39 -0600
From: Eric Blake <ebb9 AT byu DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: compilation - cygwin -mno-cygwin-flag
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According to Jay on 8/5/2008 8:08 PM:
|
| Can the ABIs be unifed?

No more than the Linux and Solaris ABI can be unified.  Think of cygwin
and -mno-cygwin as two entirely different operating systems, and you won't
be too far off.

|   line up struct stat, or make thin wrappers?
|   line up errno.h?
|   lineup lseek/fseek flags? (probably already the case)

Nowhere even near the case.  Microsoft and newlib are VASTLY different
libc implementations, coming from completely independent heritages.  You
simply cannot mix them and expect reasonable results.

|   keep FILE* opaque?

And how is your code supposed to know when it is calling the different
libc versions, which then dereference the opaque structure?  They simply
aren't compatible.

|
| ABI multiplicity bugs me..

This is not ABI multiplicity - it is two entirely different porting
platforms, that happen to run on the same hardware.  Using -mno-cygwin is
in essence a statement that you are cross-compiling; running the compiler
on one platform but generating object code for another.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9 AT byu DOT net
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