diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2e81442298c6..c4e99469bc20 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,6 +20,10 @@ jobs:
       matrix:
         libgccjit_version:
           - { gcc: "libgccjit.so", artifacts_branch: "master" }
+        commands: [
+          "--test-successful-rustc --nb-parts 2 --current-part 0",
+          "--test-successful-rustc --nb-parts 2 --current-part 1",
+        ]
 
     steps:
     - uses: actions/checkout@v3
@@ -104,9 +108,4 @@ jobs:
 
     - name: Run tests
       run: |
-        ./test.sh --release --clean --release-sysroot --build-sysroot --mini-tests --std-tests # --test-libcore # FIXME(antoyo): libcore tests fail.
-
-    - name: Run stdarch tests
-      run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
-        CHANNEL=release TARGET=x86_64-unknown-linux-gnu ../../../../cargo.sh test
+        ./test.sh --release --clean --release-sysroot --build-sysroot ${{ matrix.commands }}
diff --git a/.github/workflows/stdarch.yml b/.github/workflows/stdarch.yml
new file mode 100644
index 000000000000..42fb35e738ff
--- /dev/null
+++ b/.github/workflows/stdarch.yml
@@ -0,0 +1,116 @@
+name: stdarch tests with sysroot compiled in release mode
+
+on:
+  - push
+  - pull_request
+
+permissions:
+  contents: read
+
+env:
+  # Enable backtraces for easier debugging
+  RUST_BACKTRACE: 1
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        libgccjit_version:
+          - { gcc: "libgccjit.so", artifacts_branch: "master" }
+        commands: [
+          "--test-successful-rustc --nb-parts 2 --current-part 0",
+          "--test-successful-rustc --nb-parts 2 --current-part 1",
+        ]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - uses: actions/checkout@v3
+      with:
+        repository: llvm/llvm-project
+        path: llvm
+
+    - name: Install packages
+      run: sudo apt-get install ninja-build ripgrep
+
+    - name: Download artifact
+      uses: dawidd6/action-download-artifact@v2
+      with:
+          workflow: main.yml
+          name: ${{ matrix.libgccjit_version.gcc }}
+          path: gcc-build
+          repo: antoyo/gcc
+          branch: ${{ matrix.libgccjit_version.artifacts_branch }}
+          event: push
+          search_artifacts: true # Because, instead, the action only check the last job ran and that won't work since we want multiple artifacts.
+
+    - name: Setup path to libgccjit
+      run: |
+          echo $(readlink -f gcc-build) > gcc_path
+          # NOTE: the filename is still libgccjit.so even when the artifact name is different.
+          ln gcc-build/libgccjit.so gcc-build/libgccjit.so.0
+
+    - name: Set env
+      run: |
+        echo "LIBRARY_PATH=$(cat gcc_path)" >> $GITHUB_ENV
+        echo "LD_LIBRARY_PATH=$(cat gcc_path)" >> $GITHUB_ENV
+        echo "workspace="$GITHUB_WORKSPACE >> $GITHUB_ENV
+
+    - name: Set RUST_COMPILER_RT_ROOT
+      run: echo "RUST_COMPILER_RT_ROOT="${{ env.workspace }}/llvm/compiler-rt >> $GITHUB_ENV
+
+    - name: Cache cargo installed crates
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/bin
+        key: cargo-installed-crates2-ubuntu-latest
+
+    - name: Cache cargo registry
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry2-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo index
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo target dir
+      uses: actions/cache@v3
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('rust-toolchain') }}
+
+    - name: Build
+      run: |
+        ./prepare_build.sh
+        ./build.sh --release --release-sysroot
+        cargo test
+        ./clean_all.sh
+
+    - name: Prepare dependencies
+      run: |
+        git config --global user.email "user@example.com"
+        git config --global user.name "User"
+        ./prepare.sh
+
+    # Compile is a separate step, as the actions-rs/cargo action supports error annotations
+    - name: Compile
+      uses: actions-rs/cargo@v1.0.3
+      with:
+        command: build
+        args: --release
+
+    - name: Run tests
+      run: |
+        ./test.sh --release --clean --release-sysroot --build-sysroot --mini-tests --std-tests --test-libcore
+
+    - name: Run stdarch tests
+      run: |
+        cd build_sysroot/sysroot_src/library/stdarch/
+        CHANNEL=release TARGET=x86_64-unknown-linux-gnu ../../../../cargo.sh test
diff --git a/src/base.rs b/src/base.rs
index ea933c25b2f3..6102016b4345 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -124,6 +124,8 @@ pub fn compile_codegen_unit<'tcx>(tcx: TyCtxt<'tcx>, cgu_name: Symbol, supports_
         context.add_command_line_option("-fno-semantic-interposition");
         // NOTE: Rust relies on LLVM not doing TBAA (https://github.com/rust-lang/unsafe-code-guidelines/issues/292).
         context.add_command_line_option("-fno-strict-aliasing");
+        // NOTE: Rust relies on LLVM doing wrapping on overflow.
+        context.add_command_line_option("-fwrapv");
 
         if tcx.sess.opts.unstable_opts.function_sections.unwrap_or(tcx.sess.target.function_sections) {
             context.add_command_line_option("-ffunction-sections");