puredata externals in cpp

Requirements

Quickstart: see the helloworld project for a very minimal example.

To compile a puredata external with c++ on macOS Catalina:

1. Use pd-lib-builder

2. Wrap <name>_setup function with extern "C" { <name_setup }

3. class_new call in <name>_setup should terminate with A_NULL instead of 0.

4. In the project Makefile, for macOS Catalina at least, add the following to cflags:

cflags += -stdlib=libc++ -mmacosx-version-min=10.9

Credits

• ref: https://lists.puredata.info/pipermail/pd-list//2018-06/122775.html