From:	Martin Str|mberg <ams AT speedy DOT ludd DOT luth DOT se>
Subject:	Re: Alignment problem in GCC 2.95.2
Newsgroups:	comp.os.msdos.djgpp
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Date:	25 Aug 2002 15:20:55 GMT
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Kernel Panic <rzhevskiy AT mail DOT ru> wrote:
: I'm using GCC 2.95.2 (DJGPP) and having a problem with alignment.. Compiling
: the following line:

: kernel_info_page_t kernel_info_page __attribute__((aligned(PAGE_SIZE)))

: (it's beginning of a structure) I get a message like:

: global.c:31: warning: alignment of `struct kernel_info_page_t
: kernel_info_page' is greater than maximum object file alignment. Using 4.

: I haven't found any other way to set the alignment than with ugly assembler
: macros.

Can I see those macros? I'm interested myself in such aligning.

> This compiled correctly on FreeBSD (with the same GCC version!
: Though I don't understand how it's possible..)..

FreeBSD is perhaps using something other than COFF?

: Any suggestions?.. BTW, how does GCC know what file format it's actually

I wrote my own linker script that aligns the .bss section to 4096 and
make sure my structures that need this alignment comes first. On the
other hand I also have some more structures that need this alignment
and their number isn't known until the program is running. So I need
to align the end of .bss too. Thus perhaps I should just ditch my
first alignment and put everything at the end.

: going to be?..

Compiled in default, perhaps.


Right,

						MartinS

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