Re: Control initialised data layout?
Re: Control initialised data layout?
- Subject: Re: Control initialised data layout?
- From: "Kyle Sluder" <email@hidden>
- Date: Mon, 30 Jul 2007 09:57:41 -0400
If it doesn't matter where these strings start, and these strings
don't need to be accessed by your code, you could locate them in their
own section using attributes.
http://www.ohse.de/uwe/articles/gcc-attributes.html#func-section
On 7/30/07, Martin Crane <email@hidden> wrote:
> Hi,
>
> Is there a way to control the layout of the initialized data segment of a
> MACH-O binary?
>
> The problem I'm having is that some code I am porting expects a static char
> array, followed by a char array to be in the order defined in the source
> code, but this isn't the case when compiled with Xcode. I know it sounds
> horrible (it is!), but the binary is scanned by an external app for copy
> protection purposes and these two buffers must be laid out correctly in
> order for it to work. I can't change it... and needless to say, the
> CodeWarrior (OS 9) and Windows versions don't have this problem.
>
> So, to demonstrate, in the code I have (example, not real!):
>
> static unsigned char gBuffer1[8] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g',
> 'h'};
> unsigned char gBuffer2[8] = { 'h', 'g', 'f', 'e', 'd', 'c', 'b', 'a'};
>
>
> and the external app expects to see "abcdefghhgfedcba" in the data area of
> the binary.
>
> Unfortunately, the resultant layout from an Xcode compile gives a binary
> with this:
>
> "hgfedcba<lots of strings and other data here>abcdefgh"
>
> For what it's worth, this is a Carbon app.
>
> Any suggestions highly welcome!
>
> Regards,
>
> Martin Crane
> Macintosh Software Engineer
> http://www.vicomsoft.com
> Policing For Productivity
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