From 14fe7a081a8260bbbfc7929a14ec4187faaa3c25 Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@users.noreply.github.com>
Date: Mon, 16 Jan 2023 16:23:08 -0500
Subject: YJIT: Use ThinLTO for Rust parts in release mode

This reduces the code size of libyjit.a by a lot. On darwin it went from
23 MiB to 12 MiB for me. I chose ThinLTO over fat LTO for the relatively
fast build time; in case we need to debug release-build-only problems
it won't be painful.
---
 common.mk       | 1 +
 yjit/Cargo.toml | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/common.mk b/common.mk
index ac627181e0..9dd35eebc2 100644
--- a/common.mk
+++ b/common.mk
@@ -225,6 +225,7 @@ YJIT_RUSTC_ARGS = --crate-name=yjit \
 	--crate-type=staticlib \
 	--edition=2021 \
 	-g \
+	-C lto=thin \
 	-C opt-level=3 \
 	-C overflow-checks=on \
 	'--out-dir=$(CARGO_TARGET_DIR)/release/' \
diff --git a/yjit/Cargo.toml b/yjit/Cargo.toml
index 18b1d10bd8..d2d54edc78 100644
--- a/yjit/Cargo.toml
+++ b/yjit/Cargo.toml
@@ -45,3 +45,5 @@ opt-level = 3
 overflow-checks = true
 # Generate debug info
 debug = true
+# Use ThinLTO. Much smaller output for a small amount of build time increase.
+lto = "thin"
-- 
cgit v1.2.3