Use a single codegen-unit for compilation #231
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Use a single codegen-unit for compilation
as suggested in
https://nnethercote.github.io/perf-book/build-configuration.html#codegen-units
to achieve reproducible builds.
It can also enhance optimizations of the produced binary.
This patch was done while working on reproducible builds for openSUSE, sponsored by the NLnet NGI0 fund.