Correct detection for mypy

mesonbuild/compilers/detect.py

@@ -633,6 +633,9 @@ def sanitize(p: str) -> str:
             elif 'MCS' in err:
                 cls = c.TaskingMCSCCompiler
                 lnk = linkers.TaskingMCSLinker
+            else:
+                raise EnvironmentException(f'Failed to detect linker for TASKING VX-toolset compiler. Please update your cross file(s).')
+
 
             tasking_ver_match = re.search(r'v(\d+)\.(\d+)r(\d+) Build (\d+)', err)
             assert tasking_ver_match is not None, 'for mypy'
@@ -641,7 +644,7 @@ def sanitize(p: str) -> str:
             env.coredata.add_lang_args(cls.language, cls, for_machine, env)
             ld = env.lookup_binary_entry(for_machine, cls.language + '_ld')
 
-            linker = lnk(ld, for_machine, version=tasking_version)
+            linker = lnk(ld, for_machine, version=tasking_version) # Fix needed here
             return cls(
                 ccache, compiler, tasking_version, for_machine, is_cross, info,
                 exe_wrap, full_version=full_version, linker=linker)