[Cfp-interest 2930] issue about type-generic macros and new augmented arithmetic header

[Jim Thomas]

This is about an issue that arose in reworking TS-4r to use new headers. The current draft of TS-4r adds augmented-arithmetic functions to <math.h> and type-generic macros for them to <tgmath.h>. The draft in progress has the augmented arithmetic functions in a new header <augarith.h>. The issue is, what to do with their type-generic macros?

Adding new macros to <tgmath.h> in contrary to our given direction to introduce new identifiers in new headers.

Adding type-generic macros, along with the functions, unconditionally to <augarith.h> would have the effect of overriding the functions.

These resolution options came to mind:

1. Add the type generic macros to <augarith.h> conditioned by a user-defined WANT macro, e.g. __STDC_WANT_TGAUGARITH__.

2. Add the type generic macros to <augarith.h> conditioned by whether <tgmath.h> has been included.

3. Remove the type-generic macros for augmented arithmetic from the TS.

Your thoughts?

- JIm Thomas

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