This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
Re: PowerPC32 .gnu.attributes in crt files
On Fri, 18 Feb 2011, Alan Modra wrote:
> On Thu, Feb 17, 2011 at 08:31:54PM -0500, Carlos O'Donell wrote:
> > Is anyone working on adding don't-care attributes or working on
> > suppressing attributes if they don't apply?
>
> I was going to poke at it. If I understand correctly, the three
> existing powerpc attributes are all about parameter passing and
> function return values. Tag_GNU_Power_ABI_FP says how floating point
> parameters are passed and returned, Tag_GNU_Power_ABI_Vector does the
> same for vectors, and Tag_GNU_Power_ABI_Struct_Return says how <= 8
> byte structures are returned. Am I missing anything, Joseph?
One thing to note is that it's not just all objects containing a
definition of or a call to a function with a floating-point argument or
return value (including compiler-generated libcalls to libgcc functions,
not just calls written in the source code) that care about how
floating-point parameters are passed and returned; because of the
complexities of the ABI for variadic functions, it would be safest also to
say that any object containing a call to va_arg, a definition of a
variadic function or a call to a variadic function also cares.
--
Joseph S. Myers
joseph@codesourcery.com