[patch] Do not generate discriminator directive in strict mode

[Eric Botcazou]

Hi,

it appears that the (standard DWARF as of version 4) discriminator directive 
can confuse non-GDB DWARF 2/3 debuggers, so this patch changes the compiler 
to stop emitting it in strict mode.

Tested on i586-suse-linux, OK for the mainline?


2011-04-19  Eric Botcazou  <ebotcazou@adacore.com>

	* dwarf2out.c (dwarf2out_source_line): Emit "discriminator" directive
	only for version 4 or above, or else in non-strict mode.


-- 
Eric Botcazou
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