Re: C++20 and gcc12/10

[David Holland <dholland-pkgtech%netbsd.org@localhost>]

On Fri, Apr 04, 2025 at 08:06:16AM +0100, Jonathan Perkin wrote:
 > > Is it reasonable to commit
 > > 
 > >  -USE_CXX_FEATURES=      c++20
 > >  +# gcc10's C++20 support seems to be adequate and since an explicit
 > >  +# requirement of C++20 requires building gcc12 on 10.x and elsewhere,
 > >  +# hold off on the stricter constraint for now.
 > >  +#USE_CXX_FEATURES=     c++20
 > >  +GCC_REQD+=             10
 > > 
 > > in packages where it works? It's easy enough to put back the stronger
 > > constraint if the build stops working.
 > 
 > No, this belongs in infrastructure.  A package should only have to declare
 > what it needs in terms of compiler support, not have OS-specific hacks
 > spread across them.  Since adding support for *_FEATURES there shouldn't be
 > any GCC_REQD in packages.

Ahem. There's nothing OS-specific about "it works with gcc10".

 > [snip irrelevant]
 >
 > Also, if only specific parts of c++20 are required and they would be
 > satisfied by GCC 10.x then they should be newly added to USE_CXX_FEATURES
 > and handled appropriately.

ok then, so what should the FEATURE be called? c++20-gcc10? c++20-lite?

-- 
David A. Holland
dholland%netbsd.org@localhost