Compile sysroot in release mode by default

Fixes rust-lang#938

Author: bjorn3

build_sysroot/Cargo.toml

@@ -21,3 +21,4 @@ rustc-std-workspace-std = { path = "./sysroot_src/src/tools/rustc-std-workspace-
 
 [profile.release]
 debug = true
+incremental = true

build_sysroot/build_sysroot.sh

@@ -18,7 +18,7 @@ rm -r sysroot/ 2>/dev/null || true
 export RUSTFLAGS="$RUSTFLAGS -Z force-unstable-if-unmarked"
 if [[ "$1" == "--release" ]]; then
     sysroot_channel='release'
-    RUSTFLAGS="$RUSTFLAGS -Zmir-opt-level=3" cargo build --target $TARGET_TRIPLE --release
+    RUSTFLAGS="$RUSTFLAGS -Zmir-opt-level=2" cargo build --target $TARGET_TRIPLE --release
 else
     sysroot_channel='debug'
     cargo build --target $TARGET_TRIPLE

test.sh

@@ -38,7 +38,7 @@ $RUSTC example/arbitrary_self_types_pointers_and_wrappers.rs --crate-name arbitr
 $RUN_WRAPPER ./target/out/arbitrary_self_types_pointers_and_wrappers
 
 echo "[BUILD] sysroot"
-time ./build_sysroot/build_sysroot.sh
+time ./build_sysroot/build_sysroot.sh --release
 
 echo "[AOT] alloc_example"
 $RUSTC example/alloc_example.rs --crate-type bin --target $TARGET_TRIPLE
@@ -71,10 +71,6 @@ $RUN_WRAPPER ./target/out/track-caller-attribute
 echo "[BUILD] mod_bench"
 $RUSTC example/mod_bench.rs --crate-type bin --target $TARGET_TRIPLE
 
-# FIXME linker gives multiple definitions error on Linux
-#echo "[BUILD] sysroot in release mode"
-#./build_sysroot/build_sysroot.sh --release
-
 pushd simple-raytracer
 if [[ "$HOST_TRIPLE" = "$TARGET_TRIPLE" ]]; then
     echo "[BENCH COMPILE] ebobby/simple-raytracer"