Build and Debug Active File on macOS using (real) gcc/g++, shows no instructions in Disassembly view

[Colengms]

Repro:

• On Intel-based macOS
• Use a simple 'hello world'
• Place a breakpoint
• Use Build and Debug Active File to generate a tasks.json file - select a real version of g++ (specifically installed on the system, and not a fake gcc/g++ that points to Apple's Clang. i.e. brew install gcc. Be sure to install gdb as well.)
• After hitting the breakpoint, open the Disassembly view. I see:

Andrew suggested this is due to our debug config provider specifying LLDB, whereas GDB is needed for (real) gcc/g++.

It would seem necessary to determine whether the compiler requires LLDB or GDB using something more than just the compiler name. Whether a compiler is clang or not could be determined by querying it to see if certain defines are present.