diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0e3defd583b..3d9b6898b6e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -62,6 +62,12 @@ jobs:
         path: target
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('rust-toolchain') }}
 
+    - name: Build
+      run: |
+        ./prepare_build.sh
+        ./build.sh
+        ./clean_all.sh
+
     - name: Prepare dependencies
       run: |
         git config --global user.email "user@example.com"
diff --git a/Readme.md b/Readme.md
index 5306e8ac574..d6a7a717dca 100644
--- a/Readme.md
+++ b/Readme.md
@@ -21,6 +21,13 @@ You can also use my [fork of gcc](https://github.com/antoyo/gcc) which already i
 ```bash
 $ git clone https://github.com/antoyo/rustc_codegen_gcc.git
 $ cd rustc_codegen_gcc
+$ ./prepare_build.sh # download and patch sysroot src
+$ ./build.sh --release
+```
+
+To run the tests:
+
+```bash
 $ ./prepare.sh # download and patch sysroot src and install hyperfine for benchmarking
 $ ./test.sh --release
 ```
diff --git a/build.sh b/build.sh
new file mode 100755
index 00000000000..9f1228687e2
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+#set -x
+set -e
+
+export GCC_PATH=$(cat gcc_path)
+
+export LD_LIBRARY_PATH="$GCC_PATH"
+export LIBRARY_PATH="$GCC_PATH"
+
+if [[ "$1" == "--release" ]]; then
+    export CHANNEL='release'
+    CARGO_INCREMENTAL=1 cargo rustc --release
+else
+    echo $LD_LIBRARY_PATH
+    export CHANNEL='debug'
+    cargo rustc
+fi
+
+source config.sh
+
+rm -r target/out || true
+mkdir -p target/out/gccjit
+
+echo "[BUILD] sysroot"
+time ./build_sysroot/build_sysroot.sh $CHANNEL
diff --git a/prepare.sh b/prepare.sh
index 8d57e77018e..503fa29b362 100755
--- a/prepare.sh
+++ b/prepare.sh
@@ -1,8 +1,8 @@
 #!/bin/bash --verbose
 set -e
 
-rustup component add rust-src rustc-dev llvm-tools-preview
-./build_sysroot/prepare_sysroot_src.sh
+source prepare_build.sh
+
 cargo install hyperfine || echo "Skipping hyperfine install"
 
 git clone https://github.com/rust-lang/regex.git || echo "rust-lang/regex has already been cloned"
diff --git a/prepare_build.sh b/prepare_build.sh
new file mode 100755
index 00000000000..ccf53509830
--- /dev/null
+++ b/prepare_build.sh
@@ -0,0 +1,5 @@
+#!/bin/bash --verbose
+set -e
+
+rustup component add rust-src rustc-dev llvm-tools-preview
+./build_sysroot/prepare_sysroot_src.sh