Go patch committed: Add -o option when linking

[Ian Lance Taylor]

The Go compiler needs to see all input files at once, rather than be
invoked separately on each one.  The gcc driver will only do that if the
static combine_inputs variable is set.  And combine_inputs is only set
if the -o option is used (or LTO-specific -fwpa option is used).  The
gccgo driver currently automatically adds a -o option when compiling
when no -o option is seen.  That is sufficient for the normal case, but
does not handle the case of linking without a -o option.  Linking
without a -o option is unusual but of course it ought to work correctly.
I don't want to mess with the general driver code in stage 4, so I have
modified the gccgo driver to add a -o option even when linking.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian


2012-02-17  Ian Lance Taylor  <iant@google.com>

	* gospec.c (lang_specific_driver): If linking, and no -o option
	was used, add one.


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