[LLVMdev] Speeding up make by 4 seconds :)

[Reid Spencer]

I found a way to reduce the amount of processing GNU make does when
building with the LLVM Makefile system: "make -r". We don't need or use
any of the built-in rules that make has. The -r option omits them. This
means make will perform many thousand fewer (and unnecessary) tests.
When I did:

make ; time make ; time make -r 

You should get something like:

make:
real    0m6.484s
user    0m4.787s
sys     0m1.661s

make -r:
real    0m2.896s
user    0m1.803s
sys     0m0.856s

This shaves a few seconds off the makefile processing. This might help
out a bit on slower machines.

Reid.
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