Commits on Mar 4, 2020

1. cmake: Additional controls to customize required/optional dependencies …

   New cmake variables `REQUIRED_DEPS` and `OPTIONAL_DEPS`.
   
   `REQUIRED_DEPS` is a list of individual package dependencies that are
   ordinarily optional (meaning, if not found, the build continues,
   possibly disabling some functionality or format support), and forcing
   them to be required (build failure if not found). Note that "ALL"
   means everying.
   
   `OPTIONAL_DEPS` is a list of individual package dependencies that
   makes them optional even if ordinarily (or via `REQUIRED_DEPS`) would
   be treated as optional. **Extreme caution necessary!** If you take
   something required and force it to be optional, there's no telling
   what else in the build might break as a result.
   
   A typical use case might be if you have automated builds and want to be
   sure that if for some reason they can't find all the dependencies (even the
   optional ones), you will definitely fail the build. But maybe you have some
   exceptions. For example,
   
       cmake ... -DREQUIRED_DEPS=ALL -DOPTIONAL_DEPS="DCMTK;R3DSDK"
   
   That means that you want any missing package dependencies to cause the build
   to fail, *except* for missing DCMTK and R3DSDK, which you don't care about.
   
   Also did some cleanup to turn PNG into an optional dependency, including
   graceful disabling of ICO if libpng is not found.

   

   lgritz committed Mar 4, 2020
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