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rustc: Pass -dead_strip on OSX #13829

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Apr 29, 2014
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rustc: Pass -dead_strip on OSX #13829

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12 changes: 12 additions & 0 deletions src/librustc/back/link.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1150,6 +1150,18 @@ fn link_args(sess: &Session,
sess.opts.optimize == session::Aggressive {
args.push("-Wl,-O1".to_owned());
}
} else if sess.targ_cfg.os == abi::OsMacos {
// The dead_strip option to the linker specifies that functions and data
// unreachable by the entry point will be removed. This is quite useful
// with Rust's compilation model of compiling libraries at a time into
// one object file. For example, this brings hello world from 1.7MB to
// 458K.
//
// Note that this is done for both executables and dynamic libraries. We
// won't get much benefit from dylibs because LLVM will have already
// stripped away as much as it could. This has not been seen to impact
// link times negatively.
args.push("-Wl,-dead_strip".to_owned());
}

if sess.targ_cfg.os == abi::OsWin32 {
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