[buildcore] Cleanup type annotations in Python scripts

deps/buildcore/scripts/setup-build.py

@@ -18,7 +18,7 @@ import sys
 from pybb import mkdir, rm
 
 
-def main():
+def main() -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument('--target', help='Platform target',
                         default='{:s}-{:s}'.format(sys.platform, platform.machine()))
@@ -39,7 +39,7 @@ def main():
         sanitizer_status = 'OFF'
     else:
         print('Error: Invalid build tool')
-        sys.exit(1)
+        return 1
 
     if args.build_tool == 'xcode':
         build_config = '{:s}-{:s}'.format(args.target, args.build_tool)
@@ -60,12 +60,11 @@ def main():
         build_tool = '-GXcode'
     else:
         print('Error: Invalid build tool')
-        sys.exit(1)
+        return 1
 
     project_dir = os.getcwd()
     build_dir = '{:s}/build/{:s}'.format(project_dir, build_config)
     rm(build_dir)
-    mkdir(build_dir)
     cmake_cmd = [
         'cmake', '-S', project_dir, '-B', build_dir, build_tool,
         '-DCMAKE_EXPORT_COMPILE_COMMANDS=ON',
@@ -91,10 +90,11 @@ def main():
     rm('compile_commands.json')
     if platform.system() != 'Windows':
         os.symlink('build/{:s}/compile_commands.json'.format(build_config), 'compile_commands.json')
+    return 0
 
 
 if __name__ == '__main__':
     try:
-        main()
+        sys.exit(main())
     except KeyboardInterrupt:
         sys.exit(1)