Makefile variable to pass configure options when building benchmarks

[shakthimaan]

Compiler developers would like to observe metric changes when passing -O2 and -O3 configure options to the compiler when building the benchmarks.

Reference: ocaml-bench/sandmark-nightly-config#5 (comment)

[punchagan]

@shakthimaan Would the configure field not be sufficient for this?

[shakthimaan]

Would the configure field not be sufficient for this?

For a single run, yes. At present, the unit of operation is a benchmark run. We do not have the notion of an experiment.

It will be useful to describe an experiment with multiple test configuration options, run benchmarks, and compare the results.