done.
recompile gcc from cvs.
~d
On Tuesday 06 July 2004 18:38, Remy Blank wrote:
> (Sorry if this post appears twice, the first one didn't seem to come
> through...)
>
> Hello everybody,
>
> I am trying to use the "alias" attribute for functions. From the gcc
> manual:
>
> `alias ("target")'
> The `alias' attribute causes the declaration to be emitted as an
> alias for another symbol, which must be specified. For instance,
>
> void __f () { /* do something */; }
> void f () __attribute__ ((weak, alias ("__f")));
>
> declares `f' to be a weak alias for `__f'. In C++, the mangled
> name for the target must be used.
>
> Not all target machines support this attribute.
>
> msp430-gcc gives me the following warning:
>
> Scheduler.c:101: warning: alias definitions not supported in this
> configuration; ignored
>
> So I guess it's not implemented (yet). How difficult would it be to
> implement the "alias" attribute?
>
> I've never hacked gcc. However, I've been looking at the file
> gcc/gcc-3.3/gcc/config/msp430/msp430.c, where attributes are processed,
> and I think I would be able to implement a simple attribute like
> "wakeup" that only requires slightly changing a function prologue or
> epilogue. However, as specified in the manual, "alias" seems to require
> emitting some pseudo-code for a function *prototype*. Moreover, the
> "standard" attributes like "weak" and "noreturn" seem to be implemented
> in the core of gcc, and "alias" is one of them. So I'm kinda lost.
>
> I could probably implement someting easier like an
> aliasname("othername") attribute that adds a ".global othername" when
> generating the function name in asm_declare_function_name(), a bit
> similar to what interrupt(x) is doing.
>
> Ideas? Opinions? Is this someting others could find useful?
>
> Ah, in case it didn't get through, what I'm trying to do is call a
> function by two different names. The goal is to be able to implement
> custom call tables behaving similarly to the interrupt vector table, and
> to assign a function to a specific slot.
>
> I am using gcc-3.2.3 on linux.
>
> Best regards.
> -- Remy
>
>
> Remove underscore and anti-spam suffix in reply address for a timely
> response.
