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[patch] explain possible conflicts with -dCHARS


So, an internal report of someone trying to use -dM to get the predefined macros and got nothing on one platform and something on another. Hopefully the docs changes here will help in the future.

Tested by building the docs.

OK? Other preferred wording?

-eric

2007-05-24 Eric Christopher <echristo@apple.com>

	* doc/cppopts.texi: Add conflicting option note to -dM.
	* doc/invoke.texi: Add note about possible conflicts
	with -E for -dCHARS and note that -dM will not produce
	any results if there is no machine dependent reorg.


Attachment: doc.diff.txt
Description: Text document


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