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Message-Id: <199908080355.WAA03003@mercury.xraylith.wisc.edu>
To: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: Memory Violation With Windres and Shared Data Segments 
In-Reply-To: Your message of "Fri, 06 Aug 1999 22:00:33 CDT."
             <199908070300 DOT WAA30210 AT mercury DOT xraylith DOT wisc DOT edu> 
Date: Sat, 07 Aug 1999 22:55:16 -0500
From: Mumit Khan <khan AT xraylith DOT wisc DOT EDU>

Mumit Khan <khan AT xraylith DOT wisc DOT EDU> writes:
> I did look at it a bit, and here's what's needs to be done:
>   
>   - bfd (binutils): Need to be able to specify a shared flag for sections.
>     That part is somewhat easy.
>   - gas (binutils): Need to be able parse section flags containing shared
>     flag. Also easy.
>   - gcc: Somehow we need to be able to tell the compiler about this "shared"
>     link. MSVC does it with a linker comment, but GCC doesn't have such
>     a facility directly. It's going to take a bit of work. I might add
>     an __attribute__((shared)), but haven't thought of the other
>     possibilities yet.

Just to let you folks know, I just submitted patches to both binutils and
gcc to make this happen.

In the future, you'll be able to do this:
  
  int __attribute__((section ("shared"), shared)) foo = 0;
  int 
  main ()
  {
    /* do stuff to foo. */
    return 0;
  }

and all running copies of the executable will share ``foo''.

Anyone who wants to test it, let me know. I have updated copies of 
binutils-2.9.4 and gcc-2.95 binaries that you can put somewhere,
and use the -B<prefix>/ argument to test it.

Regards,
Mumit


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