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Rollup merge of #122442 - RalfJung:print-mono-items, r=compiler-errors

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extend docs of -Zprint-mono-items

Currently the values one can set this to are not documented anywhere.

I think ideally this flag wouldn't overwrite the collector's behavior, a "print" flag should just print what happens but not change what happens. But our codegen-units tests rely on being able to collect all items without the other side-effects of `-C link-dead-code` and I can't tell whether that reliance is incidental or crucial, so I'm not touching this and just documenting the (messy) status quo.
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Matthias Krüger 2024-03-13 20:01:58 +01:00 • committed by GitHub
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compiler/rustc_session/src/options.rs
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@ -1831,7 +1831,9 @@ options! {
print_llvm_passes: bool = (false, parse_bool, [UNTRACKED],
"print the LLVM optimization passes being run (default: no)"),
print_mono_items: Option<String> = (None, parse_opt_string, [UNTRACKED],
"print the result of the monomorphization collection pass"),
"print the result of the monomorphization collection pass. \
Value `lazy` means to use normal collection; `eager` means to collect all items.
Note that this overwrites the effect `-Clink-dead-code` has on collection!"),
print_type_sizes: bool = (false, parse_bool, [UNTRACKED],
"print layout information for each type encountered (default: no)"),
print_vtable_sizes: bool = (false, parse_bool, [UNTRACKED],