I'm writing a small extension, and I'm trying to use C++ constructs. I'm not actually doing anything that needs C++, but I *really* like declaring variables when I first initialize them (for example), and I also *really* like warning-free compiles.
The C++ compiler is mangling the names so they aren't visible to the extension mechanism. The following page suggests using extern C (it doesn't specify that this means extern "C", but I suppose anybody who actually knew what they were doing would have known that immediately): https://www.postgresql.org/docs/current/xfunc-c.html So I'm writing my functions to start: extern "C" Datum ... The problem is that PG_FUNCTION_INFO_V1 generates its own function declaration with a conflicting extern specification (just plain extern, which I guess means "C++" in the context of C++ code). I also tried wrapping everything - both the functions and the PG_FUNCTION_INFO_V1 invocations - in extern "C" { ... }, but now a variable declaration from fmgr.h conflicts with one from the macros. Is there a simple fix I'm missing? Any hints much appreciated.
