Re: First go at adding GCC_VERSIONS_ACCEPTED support

[David Sainty <david.sainty%gmail.com@localhost>]

On 10/10/15 22:50, David Sainty wrote:
> On 10/10/15 10:27, atomicules wrote:
> > Perhaps I should have come up with a better subject line when I 
> > started this because here's my second attempt at *not* adding 
> > GCC_VERSIONS_ACCEPTED support, but instead just seeing if there are 
> > any gcc versions installed that are equal to or greater than GCC_REQD 
> > and if there is, it uses the highest version available.
>
> I think you're not intending this as something to commit yet, but I 
> just want to mention that this style of solution is probably wrong for 
> C++.  The problem with C++ is that, depending on package build 
> ordering, packages may end up linking with multiple stdc++ libraries 
> (and including different c++ includes) from different compilers.
>
> The current GCC_REQD behaviour avoids this problem (at a hefty cost).  
> I believe PKGSRC_GCC_MIN also avoids this problem, so long as 
> PKGSRC_GCC_MIN doesn't get changed (!?).

... and assuming that PKGSRC_GCC_MIN dictates the specific compiler to 
use (E.g. if PKGSRC_GCC_MIN=4.8 and GCC_REQD=4.7, and gcc50 is installed 
and gcc48 is not, we still use 4.8, not 5.0).