--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mlir/cmake/modules/MLIRDetectPythonEnv.cmake	Tue Jun 15 19:15:29 2021 +0900
@@ -0,0 +1,26 @@
+# Macros and functions related to detecting details of the Python environment.
+
+# Detects a pybind11 package installed in the current python environment
+# and sets variables to allow it to be found. This allows pybind11 to be
+# installed via pip, which typically yields a much more recent version than
+# the OS install, which will be available otherwise.
+function(mlir_detect_pybind11_install)
+  if(pybind11_DIR)
+    message(STATUS "Using explicit pybind11 cmake directory: ${pybind11_DIR} (-Dpybind11_DIR to change)")
+  else()
+    message(STATUS "Checking for pybind11 in python path...")
+    execute_process(
+      COMMAND "${Python3_EXECUTABLE}"
+      -c "import pybind11;print(pybind11.get_cmake_dir(), end='')"
+      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+      RESULT_VARIABLE STATUS
+      OUTPUT_VARIABLE PACKAGE_DIR
+      ERROR_QUIET)
+    if(NOT STATUS EQUAL "0")
+      message(STATUS "not found (install via 'pip install pybind11' or set pybind11_DIR)")
+      return()
+    endif()
+    message(STATUS "found (${PACKAGE_DIR})")
+    set(pybind11_DIR "${PACKAGE_DIR}" PARENT_SCOPE)
+  endif()
+endfunction()