mirror of https://github.com/rust-lang/rust.git
Implement -Zfunction-sections
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@ -9,7 +9,4 @@
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object files when their content should have been changed by a change to cg_clif.</dd>
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<dt>CG_CLIF_DISPLAY_CG_TIME</dt>
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<dd>If "1", display the time it took to perform codegen for a crate</dd>
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<dt>CG_CLIF_FUNCTION_SECTIONS</dt>
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<dd>Use a single section for each function. This will often reduce the executable size at the
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cost of making linking significantly slower.</dd>
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</dl>
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@ -198,8 +198,9 @@ pub(crate) fn make_module(sess: &Session, name: String) -> ObjectModule {
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cranelift_module::default_libcall_names(),
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)
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.unwrap();
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if std::env::var("CG_CLIF_FUNCTION_SECTIONS").is_ok() {
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builder.per_function_section(true);
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}
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// Unlike cg_llvm, cg_clif defaults to disabling -Zfunction-sections. For cg_llvm binary size
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// is important, while cg_clif cares more about compilation times. Enabling -Zfunction-sections
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// can easily double the amount of time necessary to perform linking.
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builder.per_function_section(sess.opts.debugging_opts.function_sections.unwrap_or(false));
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ObjectModule::new(builder)
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}
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