[Xen-devel] Build process

[Philip Taylor <philip@xxxxxxxxxxxxxxxxxx>]

  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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