K 10
svn:author
V 8
bdrewery
K 8
svn:date
V 27
2015-10-20T20:15:25.356372Z
K 7
svn:log
V 654
Pass COMPILER_TYPE and COMPILER_VERSION to sub-makes to avoid redundant
lookups.

This uses a special variable name based on a hash of ${CC}, ${PATH}, and
${MACHINE} to ensure that a cached value is not used if any of these
values changes to use a new compiler.

Before this there were 34,620 fork/exec from bsd.compiler.mk during a buildworld.
After this there are 608.  More improvement is needed to cache a value from
the top-level before descending into subdirs in the various build phases.

Reviewed by:	brooks (earlier version)
MFC after:	3 weeks
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D3898

END