Building and Iterating

[Sean Bruno]

Before I dive into the mk files of a buildworld, I'd like to describe
"what I want" so as to start a discussion of my goal.

1.  If I select no toolchain (WITHOUT_TOOLCHAIN), but clang needs to be
built, only build a toolchain that targets the ARCH being requested.

2.  If I select no toolchain (WITHOUT_TOOLCHAIN), but clang needs to be
built, give me a knob to turn that aborts the build with a meaningful
message that lets me know I need to update the toolchain on my buildbox.

3.  If the boostrap toolchain needs to be built in the normal case, only
target the ARCH being requested.  I understand that we "want" a CC
installed that targets all architectures and this is something I agree with.

sean

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