interpreter: bump priority of default_library=static that comes from fallback

We're about to lower the priority of the default_options that were passed
to subproject() and dependency() below that of machine files and command
line options.

Whenever a static dependency is falling back to a subproject, however, do
not do that.  It makes no sense to build a shared library in that case.
Another possibility however could be to just make it an error.

Signed-off-by: Paolo Bonzini <[email protected]>

Author: bonzini

mesonbuild/interpreter/dependencyfallbacks.py

@@ -122,17 +122,17 @@ def _do_subproject(self, kwargs: TYPE_nkwargs, func_args: TYPE_nvar, func_kwargs
         # dependency('foo', static: true) should implicitly add
         # default_options: ['default_library=static']
         static = kwargs.get('static')
-        extra_default_options = {}
+        forced_options = {}
         if static is not None:
             default_library = 'static' if static else 'shared'
             mlog.log(f'Building fallback subproject with default_library={default_library}')
-            extra_default_options[OptionKey('default_library')] = default_library
+            forced_options[OptionKey('default_library')] = default_library
 
         # Configure the subproject
         subp_name = self.subproject_name
         varname = self.subproject_varname
         func_kwargs.setdefault('version', [])
-        self.interpreter.do_subproject(subp_name, func_kwargs, extra_default_options=extra_default_options)
+        self.interpreter.do_subproject(subp_name, func_kwargs, forced_options=forced_options)
         return self._get_subproject_dep(subp_name, varname, kwargs)
 
     def _get_subproject(self, subp_name: str) -> T.Optional[SubprojectHolder]:

mesonbuild/interpreter/interpreter.py

@@ -870,7 +870,7 @@ def disabled_subproject(self, subp_name: str, disabled_feature: T.Optional[str]
         return sub
 
     def do_subproject(self, subp_name: str, kwargs: kwtypes.DoSubproject, force_method: T.Optional[wrap.Method] = None,
-                      extra_default_options: T.Optional[OptionDict] = None) -> SubprojectHolder:
+                      forced_options: T.Optional[OptionDict] = None) -> SubprojectHolder:
         if subp_name == 'sub_static':
             pass
         disabled, required, feature = extract_required_kwarg(kwargs, self.subproject)
@@ -880,8 +880,16 @@ def do_subproject(self, subp_name: str, kwargs: kwtypes.DoSubproject, force_meth
             return self.disabled_subproject(subp_name, disabled_feature=feature)
 
         default_options = kwargs['default_options']
-        if extra_default_options:
-            default_options = {**extra_default_options, **default_options}
+
+        # This in practice is only used for default_library.  forced_options is the
+        # only case in which a meson.build file overrides the machine file or the
+        # command line.
+        if forced_options:
+            for k, v in forced_options.items():
+                # FIXME: this should have no business poking at augments[],
+                # but set_option() does not do what we want
+                self.coredata.optstore.augments[k.evolve(subproject=subp_name)] = v
+            default_options = {**forced_options, **default_options}
 
         if subp_name == '':
             raise InterpreterException('Subproject name must not be empty.')