RE: [PATCH] kbuild: Support clang-$ver builds

[David Laight <David.Laight@ACULAB.COM>]

From: Nick Desaulniers
> Sent: 29 October 2021 00:28
...
> > > 2. Update the documentation to describe using the
> > >
> > >    $ PATH=/usr/lib/llvm-#/bin:$PATH make LLVM=1 ...
> > >
> > >    trick. This has been the preferred method for using different
> > >    versions of LLVM but it has never been documented anywhere. This
> > >    would allow us to keep the current build infrastructure while giving
> > >    people clear instructions for how to handle different versions of
> > >    clang. As Peter has noted, this would require people who are not
> > >    familiar with building with LLVM to be constantly looking at the
> > >    documentation to remember the command to invoke, whereas with
> > >    LLVM=-#, it is easy to remember.
> >
> > Right, this is no more than a crude hack and is super unfriendly. It
> > should never have been accepted.
> 
> Lots of tools modify PATH in your `.bashrc` or `.zshrc` etc.  I don't
> see how that's any different, other than one off commands in which you
> actually intend to use a specific version.

Nothing should be modifying the default $PATH, either by hacking
my .bashrc or any system default files that get run first.

It is as horrid and broken as setting LD_LIBRARY_PATH.
Even ldconfig is pretty much a broken idea.

	David

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