ocloc (without suffix) missing from compute-runtime builds

[ph0b]

Since bbe1120, there are only suffixed versions of ocloc being built.

Some distribution package specific code calls update-alternatives at install time to then symlink a version of ocloc:

compute-runtime/scripts/packaging/opencl/sles_15/SPECS/opencl.spec

Line 118 in b6038de

update-alternatives --quiet --install /usr/bin/ocloc ocloc /usr/bin/ocloc-%{NEO_OCL_VERSION_MAJOR}.%{NEO_OCL_VERSION_MINOR}.%{NEO_OCLOC_VERSION_MODE} %{NEO_OCL_VERSION_MAJOR}%{NEO_OCL_VERSION_MINOR}%{NEO_OCLOC_VERSION_MODE}

so on such distributions, after installing built packages, calling "ocloc" works.

However:

1. compute-runtime can't be compiled and used in-place (by toolchains like DPC++ that call ocloc on path) unless locally installed with a package manager. With Blender I had to patch it out: https://projects.blender.org/blender/blender/src/branch/blender-v4.3-release/build_files/build_environment/patches/ocloc.diff
2. not all distributions support such model with update-alternatives - as an example, archlinux doesn't.

Will there be a new ocloc entry point able to use both new and legacy ocloc at the same time? Until then, can you support building a binary called ocloc without suffix, or an ocloc symlink to the version that supports current platforms being built?

Ideally this should be the default, and the update-alternatives method could be enabled behind a CMake flag instead.

[svenstaro]

As a point of reference, this is me adding a manual symlink on Arch Linux.