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From:	"Norman Vine" <nhv AT cape DOT com>
To:	<cygwin AT sourceware DOT cygnus DOT com>
Subject:	RE: New GCC available for testing (TRY 3) -- fixes -mno-cygwin pr oblem
Date:	Thu, 22 Jun 2000 23:19:05 -0400
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> Earnie Boyd writes:

>> Norman Vine wrote:

>> What is the consensus of opinion as to the 'best' way to 
>> differentiate a 'Cygwin' compile in a header file.
>> 
>> I have been stumbling apon this a lot recently
>> #if defined( _WIN32 ) 
>> 
>> which IMHO breaks Cygwin
>> 
>
>Me too, and that is why I modify the specs file to only define 
>_WIN32 and WINNT
>if the -mno-cygwin switch is specified.

Hadn't thought of doing that - cute :-)

However fine as this is for my local compiles it still doesn't 
help much when trying to write or help maintain cross-platform 
OpenSource libraries where we can not expect the user to be using
anything other then the 'as distributed' toolkit.

Also IMHO it seems as if the _WIN32 define is sometimes useful
for instance when building DLL's 

#if defined(_WIN32)
   #if defined(MAKEDLL)
   #  define INTERFACE __declspec(dllexport)
   #elif defined(USEDLL)
   #  define INTERFACE __declspec(dllimport)
   #else
   #  define INTERFACE
   #endif
#else
#  define INTERFACE
#endif   


I maintain it would be a GOOD THING if we the Cygwin user
community came up with a 'standard way' of doing this.

Regards

Norman Vine


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