Add option to link statically with hwloc (on windows)

[igchor]

Rationale

UMF is currently being used by UR and Intel/llvm. Those projects use the /DEPENDENTLOADFLAG:0x800 linker flag on Windows when building .dlls, which results in the loader only looking for .dll dependencies in System32. Since we currently do not have an installer for UMF, we cannot make UR depend on umf.dll or libwloc.dll. Instead, we need to link with UMF and hwloc statically.

Description

Add CMake option to link with hwloc statically. This may be supported only on Windows.

API Changes

None.

Implementation details

I'm not exactly sure how static linking works on windows, we might need to do something like this: https://stackoverflow.com/questions/2157629/linking-static-libraries-to-other-static-libraries or in addition to changes in UMF, also link to hwloc when building the application (UR adapter / llvm plugin).

Meta

Related PRs:

• Bump UMF version and switch to dynamic linking unified-runtime#1430
• [UR] Bump UR version and enable dynamic linking with UMF intel/llvm#13343

[igchor]

Once this is implemented and a new flag for static linking is added, we will need to:

• update [UR] Bump UR version and enable dynamic linking with UMF intel/llvm#13343 and set this newly added flag on windows
• (optional) update Bump UMF version and switch to dynamic linking unified-runtime#1430 and add a CI job for windows to test the static linking

[lukaszstolarczuk]

@igchor, does #534 fix this issue?

[igchor]

@igchor, does #534 fix this issue?

Yes, the build on intel/llvm#13343 passes with this change

[KFilipek]

@igchor, does #534 fix this issue?

Yes, the build on intel/llvm#13343 passes with this change

PR #534 was merged so you can rebase your changes.

[lukaszstolarczuk]

closing then, thx!