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[Ada] Preliminary work to coordinate Pragma Warnings and middle-end warnings


This couple of adjustments paves the way for the full coordination of Pragma
Warnings with the warnings issued by the diagnostic engine of the middle-end.

Tested on x86_64-pc-linux-gnu, committed on trunk

2013-02-06  Eric Botcazou  <ebotcazou@adacore.com>

	* erroutc.adb (Validate_Specific_Warning): Do not issue the
	warning about an ineffective Pragma Warnings for -Wxxx warnings.
	* sem_prag.adb (Analyze_Pragma) <Warnings>: Accept -Wxxx warnings.
	* gnat_rm.texi (Pragma Warnings): Document coordination with
	warnings of the GCC back-end.

Attachment: difs
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