Add hybrid compilation mode to exclude <hwloc.h> from global includes

[solbjorn]

When TMC is used project-wide and header-only, and TMC_USE_HWLOC is defined, <hwloc.h> gets included to every file due to inclusion of .ipp files.

This might be unwanted for several reasons:

• the entire project and its subprojects need to have the hwloc include folder in their include paths;
• on Windows, <hwloc.h> unconditionally includes <windows.h>, and including this file globally is a bad practice (it's overbloated, can provoke different symbol conflicts etc.).

Add a hybrid compilation mode, TMC_STANDALONE_COMPILATION_HWLOC. In this mode, one still needs to create an implementation file and define TMC_IMPL there, but only the .ipp files which include <hwloc.h> will be included and compiled there. The rest of TMC will still be header-only, so that most of potential performance gains remains.

This mode only introduce changes when TMC_USE_HWLOC is defined and TMC_WINDOWS_DLL is not. The latter requires a full standalone implementation, while without the former no files include <hwloc.h>, so that it's pointless to make anything non header-only. The default behaviour remains the same as before the change.

This mode might be improved furtherly in future by isolating the functions which use/need <hwloc.h> to separate .ipp files. Big implementation files like ex_cpu.ipp could be then inlined more aggressively.

[tzcnt]

Sorry for the late reply. I'm still thinking about how to handle the build system overall, given the variety of different requests lately

[solbjorn]

Sorry for the late reply. I'm still thinking about how to handle the build system overall, given the variety of different requests lately

Adding TMC to awesome-cpp and awesome-hpp brought its fruits ;) Great to see increasing interest in your library, well deserved.