Re: [Xen-devel] Build process

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Even if we fixed our Makefiles (and I'm not sure we can -- if we use
'?=' then we don't get 'gcc' by default because it appears CC is set
to 'cc' already) your beef is with the Linux build system. In the
Linux build system there is no way to change the compiler name to
anything other than $(CROSS_COMPILE)gcc [you can set CROSS_COMPILE
though].

Have you tried tricks like creating a symlink in a local directory to
your preferred compiler and adding it to your PATH? e.g.,
 # ln -sf `which ccache' gcc
 # PATH=`pwd`:$PATH make

 -- Keir

>    I've been playing a little with Xen on Gentoo (just out of interest, 
> rather than for any productive reason), and considered making an ebuild 
> to allow a simple "emerge xen-utilities xen-sources" method of compiling 
> the tools and kernel (probably equivalent to "emerge usermode-utilities 
> usermode-sources" for UML). (It would be easier if I knew what I was 
> doing, and I haven't actually got much working yet, but it should be 
> theoretically possible.)
> 
>    One small (but annoying) problem was that I couldn't change the 
> compiler. Some of the Makefiles set 'CC=gcc' and 'HOSTCC=gcc', which 
> referred to GCC 3.4 (which doesn't work -- I think it died while 
> compiling the kernel), and I wanted to explicitly use the GCC 3.3 
> binary. The GCC problem was relatively easily fixed by swapping my 
> system's default gcc; but I also fancied using ccache, which usually 
> works by just changing CC, and couldn't find any way to do that without 
> altering the makefiles (and I'd prefer to build from a clean copy of the 
> source).
>    Would it be possible/safe to use something like 'CC ?= gcc' and 
> 'HOSTCC ?= $(CC)' (I hope that does what I expect) in all the relevant 
> makefiles, so the compiler can be easily overriden? Or is there some 
> other solution that I've missed?
> 
> Thanks,
> -- 
> Philip Taylor
> philip@xxxxxxxxxxxxxxxxxx
> 
> 
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