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Rollup merge of #79367 - Dirbaio:trap-unreachable, r=jonas-schievink

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Allow disabling TrapUnreachable via -Ztrap-unreachable=no

Currently this is only possible by defining a custom target, which is quite unwieldy.

This is useful for embedded targets where small code size is desired. For example, on my project (thumbv7em-none-eabi) this yields a 0.6% code size reduction: 132892 bytes -> 132122 bytes (770 bytes down).
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Jonas Schievink 2020-11-24 13:17:49 +01:00 • committed by GitHub
commit 95e7af353f
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compiler/rustc_session/src/options.rs
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@ -1113,6 +1113,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
"choose the TLS model to use (`rustc --print tls-models` for details)"),
trace_macros: bool = (false, parse_bool, [UNTRACKED],
"for every macro invocation, print its name and arguments (default: no)"),
trap_unreachable: Option<bool> = (None, parse_opt_bool, [TRACKED],
"generate trap instructions for unreachable intrinsics (default: use target setting, usually yes)"),
treat_err_as_bug: Option<usize> = (None, parse_treat_err_as_bug, [TRACKED],
"treat error number `val` that occurs as bug"),
trim_diagnostic_paths: bool = (true, parse_bool, [UNTRACKED],