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

1 files changed, 8 insertions, 0 deletions

diff --git a/Tests/FindProtobuf/Test/main-generate.cxx b/Tests/FindProtobuf/Test/main-generate.cxx
new file mode 100644
index 0000000..ca33a68
--- /dev/null
+++ b/Tests/FindProtobuf/Test/main-generate.cxx
@@ -0,0 +1,8 @@
+#include <example.pb.h>
+
+int main()
+{
+  example::msgs::Example msg;
+
+  return 0;
+}