weak alias in gas on arm-elf

[Brian Sidebotham <micros at valvers dot com>]

Hi guys,

I want to make a weak alias in a startup file for target arm-elf.

I have read the docs with regards to .weak and .weakref, but I just 
can't get them to do what I want.

.weak works as I expect, and the symbols it creates are branches to the 
reset vector (pc=0). I have tried the .weak sym1 = sym2 alias assignment 
but this is not supported on arm-elf-as.

I thought .weakref would work for me, but I can't get it too. Basically, 
I want to create a list of weak symbols for handlers that may or may not 
be present in the C code. If the handler isn't present, then the code 
should infinitely loop at a dummy label.

At the moment I have:

	.extern handler1

	...

	ldr	pc, __handler1

	...

__handler1:
	bl	handler1

.weak handler1
__dummy:
	b	.

which creates:

	...

	ldr	pc, [pc, #20] ; 20 <__handler1>

	...

__handler1:
	bl	0 <startup>


Does anyone have any idea how I could effectively achieve .weak __dummy 
= handler1 ? Thanks in advance.

Brian Sidebotham.