JTC1/SC22/WG14 N692

			      Document Number: WG14 N692/J11 97-055


			       C9X Revision Proposal
			       =====================

       Title: ____Implicit int cleanup_____________________________
       Author: _____________Larry Jones____________________________
       Author Affiliation: _SDRC___________________________________
       Postal Address: _____2000 Eastman Dr, Milford, OH 45150_____
       E-mail Address: [email protected]___________________
       Telephone Number: ___513-576-2070___________________________
       Fax Number: _________513-576-2843___________________________
       Sponsor: ____________Larry Jones____________________________
       Date: _______________19 May 1997____________________________
       Proposal Category:
	  X_ Editorial change/non-normative contribution
	  __ Correction
	  __ New feature
	  __ Addition to obsolescent feature list
	  __ Addition to Future Directions
	  __ Other (please specify)
       Area of Standard Affected:
	  __ Environment
	  __ Language
	  __ Preprocessor
	  __ Library
	     __ Macro/typedef/tag name
	     __ Function
	     __ Header
	  __ Other (please specify)  ______________________________
       Prior Art: _________________________________________________
       Target Audience: ___________________________________________
       ____________________________________________________________
       ____________________________________________________________
       Related Documents (if any): N635, N636, N661________________
       ____________________________________________________________
       ____________________________________________________________
       Proposal Attached: X_ Yes __ No, but what's your interest?

       Abstract:

	At previous meetings, the committee has voted to remove
	various ``implicit int'' declarations from the language,
	but some references to these implicit declarations remain
	in the draft.  This proposal corrects these oversights
	and adds rationale.  (Section and paragraph numbers
	correspond to Draft 9.)

       Proposal:

	In subclause 6.7.1 Function definitions, Example 2,
	remove the sentence ``Note that f must be declared
	explicitly in the calling function, as its appearance in
	the expression g(f) was not followed by (.''.

	In subclause 7.1.7 Use of library functions, paragraph
	[#2], first sentence, remove the text ``, either
	explicitly or implicitly,'', and remove the second
	sentence (``If a function that accepts a variable
	number of arguments is not declared (explicitly or by
	including its associated header), the behavior is
	undefined.'').

	In subclause I.2 Undefined behavior, remove the item:

		-- A library function that accepts a variable
		   number of arguments is not declared (7.1.7).

	In the Rationale, subclause 6.3.2.2 Function calls,
	replace paragraph 4:

		The rule for implicit declaration of functions
		has been retained, but various past ambiguities
		have been resolved by describing this usage in
		terms of a corresponding explicit declaration.

	with:

		The rule for implicit declaration of functions
		has been removed.  The effect is to guarantee
		that a diagnostic is produced, which will catch
		an additional category of programming errors.
		After issuing the diagnostic, an implementation
		may choose to assume an implicit declaration and
		continue translation in order to support existing
		programs that exploited this feature.

	In the Rationale, subclause 6.7.1 Function definitions,
	add a new paragraph:

		The rule which caused undeclared parameters in an
		old-style function definition to be implicitly
		declared int has been removed; undeclared
		parameters are now a constraint violation.  The
		effect is to guarantee that a diagnostic is
		produced, which will catch an additional
		category of programming errors.  After issuing
		the diagnostic, an implementation may choose to
		assume an implicit int declaration and continue
		translation in order to support existing
		programs that exploited this feature.