Debugging Compiler
From Lazarus wiki
Here are some hints on debugging FPC compiler itself
Debugging FPC Hints
- useful procedure to place a breakpoint in is GenerateError. It's called for any kind of compilation error (syntax error, type error, assembler reader error, internal error, ...).
- like gcc there are some verbosity options to show internal representations like -vp -vv,
- Place a breakpoint in lazarus. A .lpi is in the compiler/ director (using Lazarus IDE)