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| -rw-r--r-- | mesonbuild/dependencies/base.py | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mesonbuild/dependencies/base.py b/mesonbuild/dependencies/base.py index 4f8474d4c..02b59662a 100644 --- a/mesonbuild/dependencies/base.py +++ b/mesonbuild/dependencies/base.py @@ -192,6 +192,27 @@ class ConfigToolDependency(ExternalDependency): return self.version = version + @classmethod + def factory(cls, name, environment, language, kwargs, tools, tool_name): + """Constructor for use in dependencies that can be found multiple ways. + + In addition to the standard constructor values, this constructor sets + the tool_name and tools values of the instance. + """ + # This deserves some explanation, because metaprogramming is hard. + # This uses type() to create a dynamic subclass of ConfigToolDependency + # with the tools and tool_name class attributes set, this class is then + # instantiated and returned. The reduce function (method) is also + # attached, since python's pickle module won't be able to do anything + # with this dynamically generated class otherwise. + def reduce(_): + return (cls.factory, + (name, environment, language, kwargs, tools, tool_name)) + sub = type('{}Dependency'.format(name.capitalize()), (cls, ), + {'tools': tools, 'tool_name': tool_name, '__reduce__': reduce}) + + return sub(name, environment, language, kwargs) + def find_config(self, versions=None): """Helper method that searchs for config tool binaries in PATH and returns the one that best matches the given version requirements. |