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bootstrapping with profiling feedback?


Has anyone done any work towards inserting a -fprofile-arcs step into "make bootstrap"? A search of gcc and gcc-patches list archives didn't reveal anything immediately...

I'm assuming an implementation would look something like:

build stage1 using platform compiler
build stage2 using stage1 and -fprofile-arcs
build stage3 using stage2 and -fbranch-probabilities
build stage4 using stage3 and -fbranch-probabilities
compare stage 3 and 4 .o files

Maybe this could be called "make profilestrap"? ;-)


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