Only compile when doing cross compilation sanity checks because linking gets way too complicated.

compilers.py

@@ -263,7 +263,16 @@ class CCompiler(Compiler):
         ofile = open(source_name, 'w')
         ofile.write('int main(int argc, char **argv) { int class=0; return class; }\n')
         ofile.close()
-        pc = subprocess.Popen(self.exelist + [source_name, '-o', binary_name])
+        if self.is_cross and self.exe_wrapper is None:
+            # Linking cross built apps is painful. You can't really
+            # tell if you should use -nostdlib or not and for example
+            # on OSX the compiler binary is the same but you need
+            # a ton of compiler flags to differentiate between
+            # arm and x86_64. So just compile.
+            extra_flags = ['-c']
+        else:
+            extra_flags = []
+        pc = subprocess.Popen(self.exelist + extra_flags + [source_name, '-o', binary_name])
         pc.wait()
         if pc.returncode != 0:
             raise EnvironmentException('Compiler %s can not compile programs.' % self.name_string())

interpreter.py

@@ -1526,7 +1526,7 @@ class Interpreter():
                 i = i.held_object
             except AttributeError:
                 pass
-            if not isinstance(i, (str, build.BuildTarget)):
+            if not isinstance(i, (str, build.BuildTarget, build.CustomTarget)):
                 mlog.debug('Wrong type:', str(i))
                 raise InterpreterException('Invalid argument to run_target.')
             cleaned_args.append(i)

ninjabackend.py

@@ -354,13 +354,13 @@ class NinjaBackend(backends.Backend):
         for i in target.args:
             if isinstance(i, str):
                 arg_strings.append(i)
-            elif isinstance(i, build.BuildTarget):
+            elif isinstance(i, (build.BuildTarget, build.CustomTarget)):
                 relfname = self.get_target_filename(i)
                 deps.append(relfname)
                 arg_strings.append(os.path.join(self.environment.get_build_dir(), relfname))
             else:
                 mlog.debug(str(i))
-                raise MesonException('Unreachable code.')
+                raise MesonException('Unreachable code in generate_run_target.')
         elem = NinjaBuildElement(target.name, 'CUSTOM_COMMAND', deps)
         cmd = [sys.executable, runnerscript, self.environment.get_source_dir(), self.environment.get_build_dir(), target.subdir]
         texe = target.command