The function not provided by Metal C is basically all of C++. The called module 
is written in, and exploits, C++.

Charles


On Wed, 15 Nov 2023 21:26:18 +0000, Farley, Peter <peter.far...@broadridge.com> 
wrote:

>OK, I sort of understand the “personal preference” about not using inline 
>assembler (it is kludgey, I agree) and somewhat understand the concern about 
>the “unsupported” aspect of retrieving register contents at entry, but if that 
>is the case why not use MetalC where you have much more control of the entry 
>and exit logic, and could easily provide your own version of the prolog that 
>guaranteed access to the contents of R0?  Is there some C library routine that 
>is not provided by MetalC that you would need in your Rexx external function?

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