Using the C library from Swift: thoughts

Development Core Libraries
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For instance, if _GNU_SOURCE isn't defined before you include a header from glibc, you don't get access to all its interfaces. And SwiftGlibc.h (?) doesn't define _GNU_SOURCE , so in order to access something like pthread_setname_np(), you need to either resort to dynamic loading with dlsym() or to adding a C module to your package that provides wrapper functions. (Swift Testing has both. Yay.)

Speaking of _GNU_SOURCE stuff, it reminds of the discussion of using dladdr in Swift. Many people (including me) has a demand for it and currently we have to use a C shim layer to export it for Linux platform.