CMakeLists: Do not write generated files to the source dir (onnx#3667)

This makes sure that out-of-source builds can be performed cleanly, and
in particular that multiple out-of-source builds can be performed from
the same directory.

After this commit, you can run cmake with a read-only source directory.

Signed-off-by: Geoffrey Thomas <[email protected]>

Co-authored-by: Chun-Wei Chen <[email protected]>

Author: geofft

CMakeLists.txt

@@ -277,10 +277,14 @@ function(RELATIVE_PROTOBUF_GENERATE_CPP NAME SRCS HDRS ROOT_DIR DEPEND)
           # use PYTHON_EXECUTABLE to python protoc-gen-mypy.py
           configure_file(
             ${ROOT_DIR}/tools/protoc-gen-mypy.sh.in
-            ${ROOT_DIR}/tools/protoc-gen-mypy.sh
+            ${PROJECT_BINARY_DIR}/tools/protoc-gen-mypy.sh
             @ONLY)
-          execute_process(COMMAND chmod +x ${ROOT_DIR}/tools/protoc-gen-mypy.sh)
-          set(PROTOC_MYPY_PLUGIN_FILE ${ROOT_DIR}/tools/protoc-gen-mypy.sh)
+          execute_process(COMMAND chmod +x ${PROJECT_BINARY_DIR}/tools/protoc-gen-mypy.sh)
+          configure_file(
+            ${ROOT_DIR}/tools/protoc-gen-mypy.py
+            ${PROJECT_BINARY_DIR}/tools/protoc-gen-mypy.py
+            COPYONLY)
+          set(PROTOC_MYPY_PLUGIN_FILE ${PROJECT_BINARY_DIR}/tools/protoc-gen-mypy.sh)
         else()
           set(PROTOC_MYPY_PLUGIN_FILE ${ROOT_DIR}/tools/protoc-gen-mypy.bat)
         endif()