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# HG changeset patch
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# User Mike Hommey <mh+mozilla@glandium.org>
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# Date 1595261136 0
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# Node ID fb557eeb597737455524be7bed3fa6a3ea1b7408
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# Parent 7610647673d28bb487cb2032b72a09a729c86b20
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Bug 1640982 - Set CARGO_PROFILE_RELEASE_LTO=true when enabling rust LTO. r=rstewart, a=RyanVM
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Differential Revision: https://phabricator.services.mozilla.com/D84098
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diff --git a/config/makefiles/rust.mk b/config/makefiles/rust.mk
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--- a/config/makefiles/rust.mk
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+++ b/config/makefiles/rust.mk
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@@ -42,17 +42,21 @@ endif
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endif
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# These flags are passed via `cargo rustc` and only apply to the final rustc
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# invocation (i.e., only the top-level crate, not its dependencies).
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cargo_rustc_flags = $(CARGO_RUSTCFLAGS)
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ifndef DEVELOPER_OPTIONS
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ifndef MOZ_DEBUG_RUST
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# Enable link-time optimization for release builds.
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+# Pass -Clto for older versions of rust, and CARGO_PROFILE_RELEASE_LTO=true
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+# for newer ones that support it. Combining the latter with -Clto works, so
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+# set both everywhere.
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cargo_rustc_flags += -C lto
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+export CARGO_PROFILE_RELEASE_LTO=true
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endif
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endif
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ifdef CARGO_INCREMENTAL
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export CARGO_INCREMENTAL
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endif
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rustflags_neon =
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