From 2d303fb848f73e70f42eb70c1d947601200ef4df Mon Sep 17 00:00:00 2001
From: link2xt <link2xt@testrun.org>
Date: Thu, 4 Apr 2024 16:33:21 +0000
Subject: [PATCH] Enable LTO via `cargo` profile setting

RUSTFLAGS is passed to build.rs scripts
and results in
error: lto can only be run for executables, cdylibs and static library outputs

Upstream issue: <https://github.com/rust-lang/cargo/issues/6375>
---
 scripts/build-core.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/build-core.sh b/scripts/build-core.sh
index 68c2f7d26..c7d01160a 100755
--- a/scripts/build-core.sh
+++ b/scripts/build-core.sh
@@ -17,7 +17,8 @@ rustup target add aarch64-apple-ios x86_64-apple-ios --toolchain `cat ../rust-to
 # Depending your setup, specify the rustup toolchain explicitly.
 #
 # --no-sanitize-env prevents removal of IPHONEOS_DEPLOYMENT_TARGET variable.
-RUSTFLAGS="-C lto=on -C embed-bitcode=yes" \
+CARGO_PROFILE_RELEASE_LTO=true \
+RUSTFLAGS="-C embed-bitcode=yes" \
   cargo +`cat ../rust-toolchain` lipo --xcode-integ --no-sanitize-env --manifest-path "$DIR/deltachat-core-rust/deltachat-ffi/Cargo.toml" --features jsonrpc
 
 # cargo-lipo drops result in different folder, depending on the config.