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Instead of collecting pretty printers transitively when building executables/staticlibs/cdylibs, let the debugger find each crate's pretty printers via its .debug_gdb_scripts section. This covers the case where libraries defining custom pretty printers are loaded dynamically.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.