[PATCH] Clarify documentation for -fpie and -fPIE

[Jonathan Wakely <jwakely at redhat dot com>]

I noticed a couple of missing definite articles in the description of
-fpie and -fPIE, and found the last sentence unclear. This clarifies
that it means you should use these options during compilation if you
plan to use -pie during linking (rather than implying you use these
during linking as well).

I also added a hyphen to "position independent" but maybe that part
should wait for a decision on
https://gcc.gnu.org/ml/gcc/2018-04/msg00196.html


	* doc/invoke.texi (-fpie, -fPIE): Fix grammar and clarify
	interaction with -pie.

OK for trunk?

Attachment: patch.txt
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