MAX_THREADS/NUM_THREADS not propagated to Makefile.conf_last

[StefanBruens]

Makefile.install uses MAX_THREADS when writing the pkgconfig file, and falls back to the build host core/thread count when "NUM_THREADS" is not passed to make install.

NUM_THREADS is not written to Makefile.conf_last, contrary to e.g. DYNAMIC_ARCH. This is probably an oversight.

There are other options which apparently are not saved when building the library (i.e. everything related to install directories), and are evaluated by make install/Makefile.install, but there is unfortunately no documentation when each option is evaluated - by make, make install, or both.

It is probably save to pass all options to both calls, but this is not what the current documentation suggests or uses in the examples.

[martin-frbg]

This is probably far from ideal, but the output produced at the end of the build says to repeat all the command line arguments given to make in the make install. You are certainly right that this should be made clearer in the README

[martin-frbg]

(And I do not recall offhand why it has to be like this - probably related to the cursed recursive operation of the makefiles)

[StefanBruens]

Another variable which is not saved correctly is "CORE", it is exported as TARGET to Makefile.conf_last.

The pkgconfig file then contains "UNKNOWN".

https://github.com/martin-frbg/OpenBLAS/blob/d11e7340024e919bde0dad4e8945ac86cf5fd06b/Makefile.install#L181