dependencies: Add a new class ExternalDependency

This class now consolidates a lot of the logic that each external
dependency was duplicating in its class definition.

All external dependencies now set:

* self.version
* self.compile_args and self.link_args
* self.is_found (if found)
* self.sources
* etc

And the abstract ExternalDependency class defines the methods that
will fetch those properties. Some classes still override that for
various reasons, but those should also be migrated to properties as
far as possible.

Next step is to consolidate and standardize the way in which we call
'configuration binaries' such as sdl2-config, llvm-config, pkg-config,
etc. Currently each class has to duplicate code involved with that
even though the format is very similar.

Currently only pkg-config supports multiple version requirements, and
some classes don't even properly check the version requirement. That
will also become easier now.

1 files changed, 2 insertions, 0 deletions

diff --git a/run_tests.py b/run_tests.py
index 00c2595..1e70784 100755
--- a/run_tests.py
+++ b/run_tests.py
@@ -121,6 +121,8 @@ def should_run_linux_cross_tests():
 class FakeEnvironment(object):
     def __init__(self):
         self.cross_info = None
+        self.coredata = lambda: None
+        self.coredata.compilers = {}
 
     def is_cross_build(self):
         return False