[linker] Allow asserts in sections

[Nathan Sidwell]

This patch does 2 things

1) allow assert statements inside section scripts.  This means one doesn't have 
to write the awful
	foo : {
		. = . + (ASSERT (foo, bar) & 0);
	}
any more.

I also changed the lexer to not allow ',' in NAMES when in expression mode.  I 
kept getting tripped up by
	ASSERT (FOO, "FOO zero");
which parses the first token as "FOO,".  Also I recently got bitten by EXTERN 
which allows both comma and whitespace to separate the symbol names.  Thus
	EXTERN (FOO, BAR, BAZ)
parses ok, but does not pull in the symbols you think it might.

tested on m68k-elf, ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: assert.diff
URL: <https://sourceware.org/pipermail/binutils/attachments/20070522/396d6be4/attachment.ksh>