GNU bug report logs - #9960
Compiling Emacs trunk with MSVC

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Packages: w32, emacs;

Reported by: Eli Zaretskii <eliz <at> gnu.org>

Date: Sat, 5 Nov 2011 11:24:02 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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Message #101 received at 9960 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Fabrice Popineau <fabrice.popineau <at> supelec.fr>
Cc: cschol2112 <at> googlemail.com, 9960 <at> debbugs.gnu.org
Subject: Re: bug#9960: Compiling Emacs trunk with MSVC
Date: Mon, 07 Nov 2011 19:03:18 +0200

> From: Fabrice Popineau <fabrice.popineau <at> supelec.fr>
> Date: Mon, 7 Nov 2011 17:13:09 +0100
> Cc: Christoph Scholtes <cschol2112 <at> googlemail.com>, 9960 <at> debbugs.gnu.org
> 
> Our best bet is to use a construction like :
> 
> #define GCTYPEBITS 4
> #if (1<<GCTYPEBITS) == 2
> #define ALIGN_GCTYPEBITS 2
> #elif (1<<GCTYPEBITS) == 4
> #define ALIGN_GCTYPEBITS 4
> #elif (1<<GCTYPEBITS) == 8
> #define ALIGN_GCTYPEBITS 8
> #else
> #error Define ALIGN_GCTYPEBITS
> #endif
> 
> static int __declspec(align(ALIGN_GCTYPEBITS)) test = 1;

Will this work:

  #define ALIGN_GCTYPEBITS 8
  #if (1 << GCTYPEBITS) != ALIGN_GCTYPEBITS
  #error ALIGN_GCTYPEBITS is wrong!
  #endif
  #define DECL_ALIGN(type, var) \
       type __declspec(align(ALIGN_GCTYPEBITS)) var

Since all this is needed for MSVC alone, we could then move the
ALIGN_GCTYPEBITS definition to src/s/ms-w32.h and leave only the rest
in lisp.h.  WDYT?
This bug report was last modified 13 years and 61 days ago.

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