Patch RFA: Fix -fpie -fpic

[Ian Lance Taylor]

Right now if you run "gcc -fpie -fpic" you get, in effect, "gcc -fpie".
I think you should get "gcc -fpic".  In general I think that of the
options -fpic, -fPIC, -fpie, -fPIE, -fno-pic, -fno-PIC, -fno-pie,
-fno-PIE the compiler should act as though only the last of those
options were specified.  That follows the usual formulat in which the
last option wins.

This patch implements that.  Bootstrapped and tested on
x86_64-unknown-linux-gnu.  OK for mainline?

Ian


2012-11-13  Ian Lance Taylor  <iant@google.com>

	* common.opt (fPIC, fPIE, fpic, fpie): Create a Negative loop such
	that any of these options disables the others.


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