Issue 0017.13: How does register affect compatibility of function parameters?

This issue has been automatically converted from the original issue lists and some formatting may not have been preserved.

Authors: Derek M. Jones, WG14
Date: 1992-12-10
Reference document: X3J11/90-056
Submitted against: C90
Status: Closed
Converted from: dr.htm, dr_017.html

Compatibility of functions with register on parameters

Reference subclause 6.5.4.3, page 67.

f1(int);
 f1(register int a) /* Is this function compatible with the above?  */
 {
 }

Subclause 6.5.4.3, page 68, lines 5-7 were presumably intended to make sure that the register storage class got kept in the case of a definition so that the appropriate constraints applied, i.e., it is not allowed to take its address, etc. But the further implication of the wording is that the occurrence of register lingers on for other uses - but there are no other uses.

Suggest a clarification on this point.

Comment from WG14 on 1997-09-23:

Response

The function is compatible. Storage class is not part of the type.

The relevant citation, as given, is subclause 6.5.4.3, page 68, lines 5-7, but it does not imply any “other uses.”