R devel - Mar 2025 - R-devel, bool, and C23

An older package I looked at apparently currently fails to build under
r-devel (and with that my thanks to R-universe for giving us a 'broad'
range
of builds for free -- off our development sources) over 'bool' related
changes and enum definitions.

I can get it to behave and build by declaring

  PKG_CFLAGS = -std=gnu23

but then I get a nag from both r-devel and r-release that

  W  checking compilation flags in Makevars ...
     Non-portable flags in variable 'PKG_CFLAGS':
       -std=gnu23

Reading the texi sources of r-devel's update WRE did not reveal a better
way,
but maybe I missed it. Is there are preferred approach?

(My r-release and r-devel are current(ish): 4.4.3 and r87909, respectively.)

Thanks in advance for any pointers.

Cheers, Dirk

-- 
dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org

On Fri, 14 Mar 2025 22:25:54 -0500
Dirk Eddelbuettel <edd at debian.org> wrote:
> An older package I looked at apparently currently fails to build under
> r-devel (and with that my thanks to R-universe for giving us a
> 'broad' range of builds for free -- off our development sources)
over
> 'bool' related changes and enum definitions.
> 
> I can get it to behave and build by declaring
> 
>   PKG_CFLAGS = -std=gnu23
Could you please share the compilation failure messages? The -std=gnu23
flag causes R_ext/Boolean.h to _not_ #include <stdbool.h> before
defining enum Rboolean, so the problem is likely related to that.

-- 
Best regards,
Ivan