diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/librustc/back/link.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs index 44fb8dbb4ce..9ad4a8795e2 100644 --- a/src/librustc/back/link.rs +++ b/src/librustc/back/link.rs @@ -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 { |