FindProtobuf: add flag to allow descriptor files to be generated

- The .desc files will be in the same folder as the generated .cc and .h files.
- Paths to generate .desc files are stored in a variable passed in
- This is only implemented for C++
- Remove legacy ARGS
- Add test that generates and uses C++ protobuf message
- Add test that checks that the generated .desc file can be instantiated
  with DynamicMessageFactory
- Add Help rst for new feature

2 files changed, 16 insertions, 0 deletions

diff --git a/Tests/FindProtobuf/Test/msgs/example.proto b/Tests/FindProtobuf/Test/msgs/example.proto
new file mode 100644
index 0000000..d27262e
--- /dev/null
+++ b/Tests/FindProtobuf/Test/msgs/example.proto
@@ -0,0 +1,6 @@
+syntax = "proto2";
+package example.msgs;
+
+message Example {
+  required int32 data = 1;
+}
diff --git a/Tests/FindProtobuf/Test/msgs/example_desc.proto b/Tests/FindProtobuf/Test/msgs/example_desc.proto
new file mode 100644
index 0000000..4454473
--- /dev/null
+++ b/Tests/FindProtobuf/Test/msgs/example_desc.proto
@@ -0,0 +1,10 @@
+syntax = "proto2";
+package example.msgs;
+
+import "google/protobuf/descriptor.proto";
+
+message ExampleDesc {
+  required int32 data = 1;
+
+  optional google.protobuf.FileDescriptorSet desc = 2;
+}