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Re: ld: common symbols not allowed with MH_DYLIB output format with the -multi_module option

From: Mike Stump <mrs at apple dot com>
To: Sam Lauber <sam124 at operamail dot com>
Cc: gcc at gcc dot gnu dot org, Mathieu Malaterre <mmalater at nycap dot rr dot com>
Date: Fri, 10 Jun 2005 16:37:33 -0700
Subject: Re: ld: common symbols not allowed with MH_DYLIB output format with the -multi_module option

On Friday, June 10, 2005, at 04:15 PM, Sam Lauber wrote:

#1. I need to tell the linker to use -single_module
#2. Rewrite the code to make a fake initialization
#3. I need to pass -fno-common to the compiler
From a standpoint of just getting the thing deployed, any one of these three is right.

Sigh. #2 doesn't work as the compiler can synthesize common variables that you can't control, and when it does this, things won't work. Forcing people to use -single_module strikes me as wrong.

So, from the standpoint of good advice, -fno-common is the only answer.

References:
- Re: ld: common symbols not allowed with MH_DYLIB outputformat with the -multi_module option
  - From: Sam Lauber

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