The type references are not cleaned (anymore?) and what's in memory can
be different from what will be saved to disk (which is the part that
matter).
So before linking we can check for type references (in a module) but
after linking need to see if it resolve (which means the definition,
of the reference, can still be found) and, just be be thorough, check
that's it's marked (if found).
* Move much of ErrorHandler.cs into a partial class in ErrorHandler.tools.cs,
which is referenced by mtouch and mmp (but not our runtime).
* Add ErrorHandler.runtime.cs for runtime-specific bits, including a simpler
version of ErrorHandler.Show. In particular this gets rid of the call to
Environment.Exit, which should never happen at runtime.
* Rename MonoTouchException and MonoMacException to ProductException, which
allows us to remove a lot of ifdefs.
* This required moving Application.LoadSymbols and Target.LoadSymbols to
shared mtouch/mmp code.
* Extra whitespace in step name. Found by Whitney reviewing a backport;
* Two errors not using (localizable) resources strings. I likely forgot to add the file to the original PR.
Using this option it's possible to test for the presence of a type
reference in both pre-linked and post-linked assemblies.
This makes it possible to detect if
* a 3rd party assemblies are using some specific type you would like to avoid;
* a type reference has been removed during the build (e.g. linker)
Notes:
* Custom attributes are encoded differently and not included in the assembly type references metadata.
* Assembly that define a type `X` do not have a reference (but the definition) of the type (and won't be reported).
If either the pre or post-linked warnings are not useful then it's possible
to add `-nowarn:150x` to exclude the results.
E.g.
* `-nowarn:1502` would not report references in pre-linked assemblies;
* `-nowarn:1503` would not report references in post-linked assemblies;
Finally `-warnaserror:150x` can be used to stop a build that would not
satisfy either the pre or post-linked condition.
* `-warnaserror:1502` would not report references in pre-linked assemblies;
* `-warnaserror:1503` would not report references in post-linked assemblies;
_side note_ same as https://github.com/xamarin/xamarin-macios/pull/7925
except that this one uses the localized mtouch/mmp errors only in master (so far)
Sebastien Pouliot
Rolf Bjarne Kvinge