[Octave-bug-tracker] [bug #59373] [MXE] for dependencies that use cmake, don't build static libraries

[Markus Mützel]

Follow-up Comment #15, bug #59373 (project octave):

It is quite possible that BUILD_STATIC_LIBS is a variable that just "happens"
to be used by many packages.

I saw ONLY_SHARED_LIBS in the CMakeLists.txt file of hdf5. Its description is
"Only Build Shared Libraries". So I figured this is probably what we want.
(Given that I'm still struggling to correctly interpret the messages about
BUILD_STATIC_LIBS and BUILD_SHARED_LIBS.)
I don't remember having seen that particular variable in other CMakeLists.txt
files. But tbh, I didn't focus on that then.

It's probably because I'm no native speaker, so please correct me if my
interpretation is wrong. But what I gather from `./usr/bin/cmake --help-policy
CMP0077` is: The OLD behavior (which currently is used) ignores the value we
set for e.g. BUILD_STATIC_LIBS. Instead a new (cached) variable is created
that has the value defined in the subproject. The NEW behavior (which could be
activated by a policy) lets our value override the value set by the
subproject.

If that is the case (fall back to OLD behavior), why do we see a change in
behavior?

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