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Date: Thu, 12 Mar 2009 18:20:25 +0100
From: Peter Rosin <peda AT lysator DOT liu DOT se>
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Subject: Re: [ANNOUNCEMENT] Updated: experimental package: gcc4-4.3.2-2
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Den 2009-03-12 18:01 skrev Dave Korn:
> Dave Korn wrote:
> 
>>   Why is a -D for _DLL present?  That is a reserved definition in the
>> implementation's namespace, 
> 
>   Hmmm, I may have misunderstood that.  Does -D_DLL mean something special to
> MSVC, does anyone know?

When you compile with shared libc on MSVC (e.g. -MD), it defines _DLL for you.

$ cat << EOF > dll.c
#ifdef _DLL
choke me
#endif
int foo;
EOF
$ cl -MD -c dll.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

dll.c
dll.c(2) : error C2061: syntax error : identifier 'me'
dll.c(2) : error C2059: syntax error : ';'
$ cl -c dll.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

dll.c
$

Cheers,
Peter

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