Re: libstdc++ and gcc versions (Re: [NetBSD 10.99.12 amd64] multimedia/phonon-qt5

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

On Mon, 7 Apr 2025, Jonathan Perkin wrote:
> * On 2025-04-06 at 23:40 BST, Makoto Fujiwara wrote:
>
> > | What I do is to use the same gcc version for all packages. So if one of
> > | them requires gcc12, I set GCC_REQD+= 12 in /etc/mk.conf. It will be a
> > | while before you need to increase that number but when that happens you
> > | probably have to rebuild them all.
> >
> > This is what I'm thinking. Various packages ask for different gcc versions.
> > It will result that serveral versions of gcc will be packaged. But if the 
> > only
> > one version is packaged for that run, it may be straight out some mixed
> > (libstdc++) versions.
> >
> > Can this be automated ? (hopefully at least pbulk scan)
> > -> I may be wrong,
> >
> > Let me rewrite:
> >  At particular package, serveral version of gcc may be packaged, because
> > of depending packages ask for different level, but if the only one at most
> > required is included .... (?)
>
> It's not possible to automate, because you will run into circular 
> dependencies.

Something like this will stop the circular dependency:

.if \\
        \${OPSYS} == "NetBSD" && \${OPSYS_VERSION} < 100000 && \\
        empty(PKGPATH:Mdevel/gmake) && \\
        empty(PKGPATH:Mlang/gcc10) && \\
        empty(PKGPATH:Mlang/gcc10-libs) && \\
        empty(PKGPATH:Mlang/perl5) && \\
        empty(PKGPATH:Mpkgtools/cwrappers) && \\
        empty(PKGPATH:Mpkgtools/digest) && \\
        empty(PKGPATH:Mpkgtools/mktools) && \\
        empty(PKGPATH:Mtextproc/gsed)
GCC_REQD+=10
.endif

> But yes, I also wholeheartedly recommend the approach of using 
> a single modern compiler and runtime libraries for all packages.

for the record, I used the above to rebuild all packages with GCC 10 on 
NetBSD 9 and I got coredumps with certain combinations of PHP modules. I ended up 
reverting back to the base compiler.

--
Stephen