From 38e8e85443634a2b3093e149dc1b0f90dbd84912 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Tue, 16 Dec 2025 11:05:14 -0500
Subject: [PATCH 1/5] Add CI compiling rustc

---
 .github/workflows/nightly_rustc.yml           | 66 +++++++++++++++++++
 .../bootstrap.m68k-unknown-linux-gnu.toml     | 18 +++++
 .../bootstrap.x86_64-unknown-linux-gnu.toml   | 11 ++++
 3 files changed, 95 insertions(+)
 create mode 100644 .github/workflows/nightly_rustc.yml
 create mode 100644 tests/bootstraps/bootstrap.m68k-unknown-linux-gnu.toml
 create mode 100644 tests/bootstraps/bootstrap.x86_64-unknown-linux-gnu.toml

diff --git a/.github/workflows/nightly_rustc.yml b/.github/workflows/nightly_rustc.yml
new file mode 100644
index 00000000000..d8e1e877db1
--- /dev/null
+++ b/.github/workflows/nightly_rustc.yml
@@ -0,0 +1,66 @@
+name: Nightly compilation of rustc with rustc_codegen_gcc
+
+on:
+  pull_request:
+  # TODO: remove pull_request and add schedule to run during the night.
+
+env:
+  # Enable backtraces for easier debugging
+  RUST_BACKTRACE: 1
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        arch:
+          - host_target: "x86_64-unknown-linux-gnu"
+            gcc_urls: >
+              https://github.com/rust-lang/gcc/releases/latest/download/gcc-15.deb
+          - host_target: "m68k-unknown-linux-gnu"
+            gcc_urls: >
+              https://github.com/rust-lang/gcc/releases/latest/download/gcc-15.deb
+              https://github.com/cross-cg-gcc-tools/cross-gcc/releases/latest/download/gcc-m68k-15.deb
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        path: "rustc_codegen_gcc"
+
+    - uses: actions/checkout@v4
+      with:
+        repository: "rust-lang/rust"
+        path: "rust"
+        fetch-depth: 10
+
+    - run: |
+        ls
+        echo "*****"
+        ls ..
+        echo "*****"
+        ls rust
+        echo "*****"
+
+    # `rustup show` installs from rust-toolchain.toml
+    - name: Setup rust toolchain
+      run: rustup show
+
+    - name: Setup rust cache
+      uses: Swatinem/rust-cache@v2
+
+    - name: Download and install artifacts
+      run: |
+        urls=(${{ matrix.arch.gcc_urls }})
+        for url in "${urls[@]}"; do
+            curl -L -o package.deb $url
+            sudo dpkg --force-overwrite -i package.deb
+        done
+
+    # TODO: patch linux-raw-sys and rustix.
+
+    - name: Compile rustc
+      run: |
+        cd rust
+        ./x build --host=${{ matrix.arch.host_target }} --stage 2 --config ../rustc_codegen_gcc/tests/bootstraps/bootstrap.${{ matrix.arch.host_target }}.toml
diff --git a/tests/bootstraps/bootstrap.m68k-unknown-linux-gnu.toml b/tests/bootstraps/bootstrap.m68k-unknown-linux-gnu.toml
new file mode 100644
index 00000000000..e7a7626ad01
--- /dev/null
+++ b/tests/bootstraps/bootstrap.m68k-unknown-linux-gnu.toml
@@ -0,0 +1,18 @@
+profile = "compiler"
+change-id = 140732
+
+[build]
+target = ["m68k-unknown-linux-gnu"]
+
+[rust]
+codegen-backends = ["gcc"]
+deny-warnings = false
+debug-assertions = false
+debug-assertions-std = false
+
+[gcc]
+download-ci-gcc = true
+libgccjit-libs-dir = "/home/runner/libgccjit-libs-dir"
+
+[target.m68k-unknown-linux-gnu]
+cc = "/home/runner/work/rustc_codegen_gcc/rustc_codegen_gcc/cross-gcc/usr/bin/m68k-unknown-linux-gnu-gcc"
diff --git a/tests/bootstraps/bootstrap.x86_64-unknown-linux-gnu.toml b/tests/bootstraps/bootstrap.x86_64-unknown-linux-gnu.toml
new file mode 100644
index 00000000000..32daaa57237
--- /dev/null
+++ b/tests/bootstraps/bootstrap.x86_64-unknown-linux-gnu.toml
@@ -0,0 +1,11 @@
+profile = "compiler"
+change-id = 140732
+
+[rust]
+codegen-backends = ["gcc"]
+deny-warnings = false
+debug-assertions = false
+debug-assertions-std = false
+
+[gcc]
+download-ci-gcc = true

From 3860631c56fc417fcc81263d0433c066017a39f6 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Tue, 16 Dec 2025 13:52:41 -0500
Subject: [PATCH 2/5] Compile program in the nightly CI

---
 .github/workflows/nightly_rustc.yml | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/.github/workflows/nightly_rustc.yml b/.github/workflows/nightly_rustc.yml
index d8e1e877db1..c3ee506e99f 100644
--- a/.github/workflows/nightly_rustc.yml
+++ b/.github/workflows/nightly_rustc.yml
@@ -64,3 +64,20 @@ jobs:
       run: |
         cd rust
         ./x build --host=${{ matrix.arch.host_target }} --stage 2 --config ../rustc_codegen_gcc/tests/bootstraps/bootstrap.${{ matrix.arch.host_target }}.toml
+
+    - name: Link toolchain
+      run: rustup toolchain link my-toolchain build/${{ matrix.arch.host_target }}/stage2
+
+    - name: Compile test program
+      run: |
+        cd rustc_codegen_gcc/tests/hello-world
+        cargo +my-toolchain build
+
+        objcopy --dump-section .comment=comment target/debug/hello_world
+        grep "rustc version .* with libgccjit" comment
+        grep 'GCC: ' comment
+
+        cargo +my-toolchain run > hello_world_stdout
+
+        expected_output="40"
+        test $(cat hello_world_stdout) == $expected_output || (echo "Output differs. Actual output: $(cat hello_world_stdout)"; exit 1)

From 577068a04f904d95a25908a9ac39a588f8071001 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Tue, 16 Dec 2025 14:26:44 -0500
Subject: [PATCH 3/5] Add smoke test

---
 .github/workflows/nightly_rustc.yml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/.github/workflows/nightly_rustc.yml b/.github/workflows/nightly_rustc.yml
index c3ee506e99f..db653e3c895 100644
--- a/.github/workflows/nightly_rustc.yml
+++ b/.github/workflows/nightly_rustc.yml
@@ -68,6 +68,11 @@ jobs:
     - name: Link toolchain
       run: rustup toolchain link my-toolchain build/${{ matrix.arch.host_target }}/stage2
 
+    - name: Smoke test
+      run: |
+        rustc +my-toolchain -V > output
+        grep rustc output
+
     - name: Compile test program
       run: |
         cd rustc_codegen_gcc/tests/hello-world

From b3fbe1d331c9d94c44c5872632cfe4b1cbd10de7 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Tue, 16 Dec 2025 15:22:42 -0500
Subject: [PATCH 4/5] Fix link toolchain

---
 .github/workflows/nightly_rustc.yml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/nightly_rustc.yml b/.github/workflows/nightly_rustc.yml
index db653e3c895..abca033b87e 100644
--- a/.github/workflows/nightly_rustc.yml
+++ b/.github/workflows/nightly_rustc.yml
@@ -66,7 +66,14 @@ jobs:
         ./x build --host=${{ matrix.arch.host_target }} --stage 2 --config ../rustc_codegen_gcc/tests/bootstraps/bootstrap.${{ matrix.arch.host_target }}.toml
 
     - name: Link toolchain
-      run: rustup toolchain link my-toolchain build/${{ matrix.arch.host_target }}/stage2
+      run: |
+        cd rust
+        ls
+        echo ****
+        ls build
+        echo ****
+        ls build/${{ matrix.arch.host_target }}
+        rustup toolchain link my-toolchain build/${{ matrix.arch.host_target }}/stage2
 
     - name: Smoke test
       run: |

From 869b8af1ab258379fbae352b68b181ba1c459962 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Tue, 16 Dec 2025 14:06:18 -0500
Subject: [PATCH 5/5] Create libgccjit-libs-dir

---
 .github/workflows/nightly_rustc.yml | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/nightly_rustc.yml b/.github/workflows/nightly_rustc.yml
index abca033b87e..8a7ab9bd8b4 100644
--- a/.github/workflows/nightly_rustc.yml
+++ b/.github/workflows/nightly_rustc.yml
@@ -17,12 +17,13 @@ jobs:
       matrix:
         arch:
           - host_target: "x86_64-unknown-linux-gnu"
+            cross_target: ""
             gcc_urls: >
               https://github.com/rust-lang/gcc/releases/latest/download/gcc-15.deb
           - host_target: "m68k-unknown-linux-gnu"
+            cross_target: "m68k"
             gcc_urls: >
               https://github.com/rust-lang/gcc/releases/latest/download/gcc-15.deb
-              https://github.com/cross-cg-gcc-tools/cross-gcc/releases/latest/download/gcc-m68k-15.deb
 
     steps:
     - uses: actions/checkout@v4
@@ -36,6 +37,8 @@ jobs:
         fetch-depth: 10
 
     - run: |
+        echo $HOME
+        echo "*****"
         ls
         echo "*****"
         ls ..
@@ -59,9 +62,32 @@ jobs:
         done
 
     # TODO: patch linux-raw-sys and rustix.
+    - name: Move libgccjit.so in libgccjit-libs-dir
+      if: ${{ matrix.arch.cross_target != '' }}
+      run: |
+        curl -LO https://github.com/cross-cg-gcc-tools/cross-gcc/releases/latest/download/gcc-${{ matrix.arch.cross_target }}-15.deb
+
+        sudo dpkg-deb -x gcc-${{ matrix.arch.cross_target }}-15.deb cross-gcc
+        echo ****
+        ls cross-gcc
+        echo ****
+        ls cross-gcc/usr/lib
+        echo ****
+        ls -R
+        dir=$HOME/libgccjit-libs-dir/x86_64-unknown-linux-gnu/${{ matrix.arch.host_target }}
+        mkdir -p $dir
+        # TODO: create a symlink instead of a copy.
+        cp cross-gcc/usr/lib/libgccjit.so.0.0.1 $dir/libgccjit.so
+
+        echo "$(pwd)/cross-gcc/usr/bin" >> $GITHUB_PATH
+
+        ls /home/runner/libgccjit-libs-dir/x86_64-unknown-linux-gnu/m68k-unknown-linux-gnu/libgccjit.so
+        echo ****
+        ls -R /home/runner/libgccjit-libs-dir
 
     - name: Compile rustc
       run: |
+        echo $PATH
         cd rust
         ./x build --host=${{ matrix.arch.host_target }} --stage 2 --config ../rustc_codegen_gcc/tests/bootstraps/bootstrap.${{ matrix.arch.host_target }}.toml