Add debug message

Author: sfodagain

builder/actions/cmake.py

@@ -230,6 +230,7 @@ def _build_project(env, project, cmake_extra, build_tests=False, args_transforme
     # configure
     sh.exec(*toolchain.shell_env, cmake, cmake_args, working_dir=working_dir, check=True)
 
+    print("=== toolchain.host is {}".format(toolchain.host))
     # build & install
     if toolchain.host == 'linux':
         sh.exec(*toolchain.shell_env, cmake, "--build", project_build_dir, "--config",