IDL generated files include a lot of files. Some of these are injected by generator.py automatically. At least one, "commands.h", is no longer needed. There are 467 idl files at time of writing so saving time in the generated files will have a cumulative effect.

For example, removing "commands.h" on my machine saved ~2.5s on compilation for a single generated file (fle2_get_count_info_command_gen.cpp) for a debug clang 15 x64 build.

Original:
Time (mean ± σ): 7.070 s ± 0.198 s [User: 6.657 s, System: 0.361 s]
Range (min … max): 6.848 s … 7.501 s 10 runs

New:
Time (mean ± σ): 4.330 s ± 0.077 s [User: 4.093 s, System: 0.205 s]
Range (min … max): 4.248 s … 4.507 s 10 runs