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HACKING.adoc: add tip about using linscan #10591

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HACKING.adoc: add tip about using linscan #10591

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Expand Up @@ -449,6 +449,17 @@ If `boot/ocamlc` changes (e.g. because you ran `make bootstrap`), then
the build will revert to the slower bytecode-compiled `ocamlc` until
you do the above step again.

=== Speeding up native builds on architectures with a lot of registers

On architectures with a lot of registers you can also speed up the build by using
the linear scan register allocator, e.g.:

----
export OCAMLPARAM=_,linscan=1
----

You can try this if building driver/main_args takes a lot of time.

=== Using merlin

During the development of the compiler, the internal format of compiled object
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