diff --git a/.dockerignore b/.dockerignore
index 2e0e43deb..becc94088 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,2 +1,30 @@
-# Ignore everything
-*
\ No newline at end of file
+abc
+ace2
+build
+cmake
+CMakeLists.txt
+deploy_key.enc
+docker
+Dockerfile
+docs
+libopenfpga
+libs
+LICENSE
+Makefile
+openfpga
+README.md
+run_local.bat
+run_local.sh
+vpr
+yosys
+
+!abc/abc
+!ace2/ace
+!openfpga/openfpga
+!vpr/vpr
+!yosys/yosys
+!yosys/yosys-abc
+!yosys/yosys-config
+!yosys/yosys-filterlib
+!yosys/yosys-smtbmc
+!yosys/share
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d9d057562..cda44639c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,9 +1,7 @@
 name: linux_build
 
-# Run CI on
-# - each push
-# - each pull request
-# - scheduled weekly
+# Run CI on push, PR, and weekly.
+
 on:
   push:
   pull_request:
@@ -18,123 +16,79 @@ env:
 
 # Multiple job to tests
 jobs:
+  change_detect:
+    name: "Detect code changes"
+    runs-on: ubuntu-18.04
+    outputs:
+      # this is output as string, see https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idoutputs
+      source_modified: ${{ steps.changes.outputs.status_code == '0' }}
+    steps:
+      - name: Checkout OpenFPGA repo
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          submodules: true
+      - name: Check for source code changes
+        id: changes
+        run: |
+          if git diff origin/master HEAD --name-status --exit-code -- . ':!openfpga_flow' ':!docs'; then
+            echo "::set-output name=status_code::0"
+          else
+            echo "::set-output name=status_code::$?"
+          fi
   # Test the compilation compatibility
   linux_build:
+    needs: change_detect
+    if: ${{ fromJSON(needs.change_detect.outputs.source_modified) || github.ref == 'refs/heads/master' }}
     name: ${{ matrix.config.name }}
-    runs-on: ${{ matrix.config.os }}
-
+    runs-on: ubuntu-18.04
+    container: ghcr.io/lnis-uofu/openfpga-build-${{ matrix.config.cc}}
     # Branch on different OS and settings
     strategy:
       fail-fast: false
       matrix:
         config:
-        - {
-            name: "Build Compatibility: GCC-5 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-gcc5-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-5", cxx: "g++-5"
-          }
-
-        - {
-            name: "Build Compatibility: GCC-6 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-gcc6-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-6", cxx: "g++-6"
-          }
-
-        - {
-            name: "Build Compatibility: GCC-7 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-gcc7-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-7", cxx: "g++-7"
-          }
-
-        - {
-            name: "Build Compatibility: GCC-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-gcc8-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-8", cxx: "g++-8"
-          }
-
-        - {
-            name: "Build Compatibility: GCC-9 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-gcc9-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-9", cxx: "g++-9"
-          }
-
-        - {
-            name: "Build Compatibility: Clang-6 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-clang6-build.7z",
-            os: ubuntu-18.04,
-            cc: "clang-6.0", cxx: "clang++-6.0"
-          }
-
-        - {
-            name: "Build Compatibility: Clang-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-ubuntu-18.04-clang8-build.7z",
-            os: ubuntu-18.04,
-            cc: "clang-8", cxx: "clang++-8"
-          }
-
-        - {
-            name: "Basic Regression Tests: GCC-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-basic-tests-ubuntu-18.04-gcc8-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-8", cxx: "g++-8",
-            reg_script: "basic_reg_test.sh"
-          }
-
-        - {
-            name: "FPGA-Verilog Regression Tests: GCC-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-fpga-verilog-tests-ubuntu-18.04-gcc8-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-8", cxx: "g++-8",
-            reg_script: "fpga_verilog_reg_test.sh"
-          }
-
-        - {
-            name: "FPGA-Bitstream Regression Tests: GCC-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-fpga-bitstream-tests-ubuntu-18.04-gcc8-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-8", cxx: "g++-8",
-            reg_script: "fpga_bitstream_reg_test.sh"
-          }
-
-        - {
-            name: "FPGA-SDC Regression Tests: GCC-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-fpga-sdc-tests-ubuntu-18.04-gcc8-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-8", cxx: "g++-8",
-            reg_script: "fpga_sdc_reg_test.sh"
-          }
-
-        - {
-            name: "FPGA-SPICE Regression Tests: GCC-8 (Ubuntu 18.04)",
-            artifact: "OpenFPGA-fpga-spice-tests-ubuntu-18.04-gcc8-build.7z",
-            os: ubuntu-18.04,
-            cc: "gcc-8", cxx: "g++-8",
-            reg_script: "fpga_spice_reg_test.sh"
-          }
-
-
+        - name: "Build Compatibility: GCC-5 (Ubuntu 18.04)"
+          cc: gcc-5
+          cxx: g++-5
+        - name: "Build Compatibility: GCC-6 (Ubuntu 18.04)"
+          cc: gcc-6
+          cxx: g++-6
+        - name: "Build Compatibility: GCC-7 (Ubuntu 18.04)"
+          cc: gcc-7
+          cxx: g++-7
+        - name: "Build Compatibility: GCC-8 (Ubuntu 18.04)"
+          cc: gcc-8
+          cxx: g++-8
+        - name: "Build Compatibility: GCC-9 (Ubuntu 18.04)"
+          cc: gcc-9
+          cxx: g++-9
+        - name: "Build Compatibility: Clang-6 (Ubuntu 18.04)"
+          cc: clang-6.0
+          cxx: clang++-6.0
+        - name: "Build Compatibility: Clang-8 (Ubuntu 18.04)"
+          cc: clang-8
+          cxx: clang++-8
     # Define the steps to run the build job
+    env:
+      CC: ${{ matrix.config.cc }}
+      CXX: ${{ matrix.config.cxx }}
+      CCACHE_COMPRESS: "true"
+      CCACHE_COMPRESSLEVEL: "6"
+      CCACHE_MAXSIZE: "400M"
+      CCACHE_LOGFILE: ccache_log
+      CCACHE_DIR: /__w/OpenFPGA/.ccache
     steps:
       - name: Checkout OpenFPGA repo
         uses: actions/checkout@v2
         with:
             submodules: true
 
-      - name: Install dependency
-        run: source ./.github/workflows/install_dependency.sh 
-
-      - name: Checkout CMake version
-        run: cmake --version 
-
-      - name: Checkout iVerilog version
+      - name: Dump tool versions
         run: |
-          iverilog -V 
-          vvp -V 
+          cmake --version
+          iverilog -V
+          vvp -V
 
       - name: Prepare ccache timestamp
         id: ccache_cache_timestamp
@@ -146,58 +100,164 @@ jobs:
       - name: Create CMake build environment
         # Some projects don't allow in-source building, so create a separate build directory
         # We'll use this as our working directory for all subsequent commands
-        run: cmake -E make_directory ${{runner.workspace}}/build
-      
-      - name: ccache cache files
+        run: cmake -E make_directory build
+
+      - name: Setup ccache
         uses: actions/cache@v2
         with:
-          path: ${{runner.workspace}}/.ccache
-          key: ${{ matrix.config.name }}-ccache-${{ steps.ccache_cache_timestamp.outputs.timestamp }}
+          path: |
+            /__w/OpenFPGA/.ccache
+          key: ${{ matrix.config.cc }}-ccache-${{ github.ref}}
           restore-keys: |
-            ${{ matrix.config.name }}-ccache-
-
-      # Set up the paths for ccache and control the size under 400MB
-      - name: Configure ccache
-        shell: cmake -P {0}
-        run: |
-          file(TO_CMAKE_PATH ${{runner.workspace}} ccache_basedir)
-          set(ENV{CCACHE_BASEDIR} "${ccache_basedir}")
-          set(ENV{CCACHE_DIR} "${ccache_basedir}/.ccache")
-          set(ENV{CCACHE_COMPRESS} "true")
-          set(ENV{CCACHE_COMPRESSLEVEL} "6")
-          set(ENV{CCACHE_MAXSIZE} "400M")
-
-          execute_process(COMMAND ccache -p)
-          execute_process(COMMAND ccache -z)
+            ${{ matrix.config.cc }}-ccache-
 
       - name: Configure CMake
         # Use a bash shell so we can use the same syntax for environment variable
         # access regardless of the host operating system
         shell: bash
-        working-directory: ${{runner.workspace}}/build
-        # Note the current convention is to use the -S and -B options here to specify source 
-        # and build directories, but this is only available with CMake 3.13 and higher.  
+        working-directory: build
+        # Note the current convention is to use the -S and -B options here to specify source
+        # and build directories, but this is only available with CMake 3.13 and higher.
         # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
+        #
         run: |
-          export CC=${{ matrix.config.cc }}
-          export CXX=${{ matrix.config.cxx }}
-          cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+          ccache -p
+          ccache -z
+          cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE
 
       - name: Build
-        working-directory: ${{runner.workspace}}/build
+        working-directory: build
         shell: bash
         # Execute the build.  You can specify a specific target with "--target <NAME>"
         run: |
-          cmake --build . --config $BUILD_TYPE 
+          cmake --build . --config $BUILD_TYPE
 
       # Check the cache size and see if it is over the limit
       - name: Check ccache size
-        shell: cmake -P {0}
+        run: ccache -s
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        if: ${{ matrix.config.cc == 'gcc-8'}}
+        with:
+          name: openfpga
+          path: |
+            abc/abc
+            abc/libabc.a
+            ace2/ace
+            ace2/libace.a
+            openfpga/libopenfpga.a
+            openfpga/openfpga
+            vpr/libvpr.a
+            vpr/vpr
+            yosys/share/
+            yosys/yosys
+            yosys/yosys-abc
+            yosys/yosys-config
+            yosys/yosys-filterlib
+            yosys/yosys-smtbmc
+  docker_distribution:
+    name: Build docker image for distribution
+    if: ${{ github.ref == 'refs/heads/master' }}
+    runs-on: ubuntu-latest
+    needs: linux_build
+    steps:
+      - name: Checkout OpenFPGA repo
+        uses: actions/checkout@v2
+      - name: Download a built artifacts
+        uses: actions/download-artifact@v2
+        with:
+          name: openfpga
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+      - name: Build and push master image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./docker/Dockerfile.master
+          push: true
+          tags: ghcr.io/lnis-uofu/openfpga-master:latest
+  artifact_regression_tests:
+    name: Regression tests on code changes
+    runs-on: ubuntu-18.04
+    container: ghcr.io/lnis-uofu/openfpga-env
+    needs: linux_build
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - name: basic_reg_test
+          - name: fpga_verilog_reg_test
+          - name: fpga_bitstream_reg_test
+          - name: fpga_sdc_reg_test
+          - name: fpga_spice_reg_test
+    steps:
+      - name: Checkout OpenFPGA repo
+        uses: actions/checkout@v2
+      - name: Download a built artifacts
+        uses: actions/download-artifact@v2
+        with:
+          name: openfpga
+      - name: chmod
         run: |
-          execute_process(COMMAND ccache -s)
-
-      - name: ${{matrix.config.name}}
-        if: contains(matrix.config.name, 'Regression Test')
+          chmod +x abc/abc
+          chmod +x ace2/ace
+          chmod +x openfpga/openfpga
+          chmod +x vpr/vpr
+          chmod +x yosys/yosys
+          chmod +x yosys/yosys-abc
+          chmod +x yosys/yosys-config
+          chmod +x yosys/yosys-filterlib
+          chmod +x yosys/yosys-smtbmc
+      - name: ${{matrix.config.name}}_GCC-8_(Ubuntu 18.04)
         shell: bash
-        # Execute the test. 
-        run: source ./.github/workflows/${{matrix.config.reg_script}}
+        run: source openfpga.sh && source .github/workflows/${{matrix.config.name}}.sh
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        if: ${{ failure() }}
+        with:
+          name: failed_${{matrix.config.name}}_regression_log
+          retention-days: 1
+          path: |
+            openfpga_flow/**/*.log
+  docker_regression_tests:
+    needs: change_detect
+    if: ${{ !fromJSON(needs.change_detect.outputs.source_modified) }}
+    name: Regression tests against master artifacts
+    runs-on: ubuntu-18.04
+    container: ghcr.io/lnis-uofu/openfpga-master:latest
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - name: basic_reg_test
+          - name: fpga_verilog_reg_test
+          - name: fpga_bitstream_reg_test
+          - name: fpga_sdc_reg_test
+          - name: fpga_spice_reg_test
+    steps:
+      - name: Checkout OpenFPGA repo
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: ${{matrix.config.name}}_GCC-8_(Ubuntu 18.04)
+        shell: bash
+        run: |
+          bash .github/workflows/install_dependencies_run.sh
+          python3 -m pip install -r requirements.txt
+          rsync -am --exclude='openfpga_flow/**' /opt/openfpga/. .
+          source openfpga.sh && source .github/workflows/${{matrix.config.name}}.sh
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        if: ${{ failure() }}
+        with:
+          name: failed_${{matrix.config.name}}_regression_log
+          retention-days: 1
+          path: openfpga_flow/**/*.log
diff --git a/.github/workflows/build_old.yml b/.github/workflows/build_old.yml
new file mode 100644
index 000000000..1241f2736
--- /dev/null
+++ b/.github/workflows/build_old.yml
@@ -0,0 +1,203 @@
+name: linux_build
+
+# Run CI on
+# - each push
+# - each pull request
+# - scheduled weekly
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 0 * * 0 ' # weekly
+
+# Environment variables
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+  MAKEFLAGS: "-j8"
+
+# Multiple job to tests
+jobs:
+  # Test the compilation compatibility
+  linux_build:
+    name: ${{ matrix.config.name }}
+    runs-on: ${{ matrix.config.os }}
+
+    # Branch on different OS and settings
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+        - {
+            name: "Build Compatibility: GCC-5 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-gcc5-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-5", cxx: "g++-5"
+          }
+
+        - {
+            name: "Build Compatibility: GCC-6 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-gcc6-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-6", cxx: "g++-6"
+          }
+
+        - {
+            name: "Build Compatibility: GCC-7 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-gcc7-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-7", cxx: "g++-7"
+          }
+
+        - {
+            name: "Build Compatibility: GCC-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-gcc8-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-8", cxx: "g++-8"
+          }
+
+        - {
+            name: "Build Compatibility: GCC-9 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-gcc9-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-9", cxx: "g++-9"
+          }
+
+        - {
+            name: "Build Compatibility: Clang-6 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-clang6-build.7z",
+            os: ubuntu-18.04,
+            cc: "clang-6.0", cxx: "clang++-6.0"
+          }
+
+        - {
+            name: "Build Compatibility: Clang-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-ubuntu-18.04-clang8-build.7z",
+            os: ubuntu-18.04,
+            cc: "clang-8", cxx: "clang++-8"
+          }
+
+        - {
+            name: "Basic Regression Tests: GCC-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-basic-tests-ubuntu-18.04-gcc8-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-8", cxx: "g++-8",
+            reg_script: "basic_reg_test.sh"
+          }
+
+        - {
+            name: "FPGA-Verilog Regression Tests: GCC-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-fpga-verilog-tests-ubuntu-18.04-gcc8-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-8", cxx: "g++-8",
+            reg_script: "fpga_verilog_reg_test.sh"
+          }
+
+        - {
+            name: "FPGA-Bitstream Regression Tests: GCC-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-fpga-bitstream-tests-ubuntu-18.04-gcc8-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-8", cxx: "g++-8",
+            reg_script: "fpga_bitstream_reg_test.sh"
+          }
+
+        - {
+            name: "FPGA-SDC Regression Tests: GCC-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-fpga-sdc-tests-ubuntu-18.04-gcc8-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-8", cxx: "g++-8",
+            reg_script: "fpga_sdc_reg_test.sh"
+          }
+
+        - {
+            name: "FPGA-SPICE Regression Tests: GCC-8 (Ubuntu 18.04)",
+            artifact: "OpenFPGA-fpga-spice-tests-ubuntu-18.04-gcc8-build.7z",
+            os: ubuntu-18.04,
+            cc: "gcc-8", cxx: "g++-8",
+            reg_script: "fpga_spice_reg_test.sh"
+          }
+
+
+    # Define the steps to run the build job
+    steps:
+      - name: Checkout OpenFPGA repo
+        uses: actions/checkout@v2
+        with:
+            submodules: true
+
+      - name: Install dependency
+        run: source ./.github/workflows/install_dependency_old.sh
+
+      - name: Checkout CMake version
+        run: cmake --version
+
+      - name: Checkout iVerilog version
+        run: |
+          iverilog -V
+          vvp -V
+
+      - name: Prepare ccache timestamp
+        id: ccache_cache_timestamp
+        shell: cmake -P {0}
+        run: |
+          string(TIMESTAMP current_date "%Y-%m-%d-%H;%M;%S" UTC)
+          message("::set-output name=timestamp::${current_date}")
+
+      - name: Create CMake build environment
+        # Some projects don't allow in-source building, so create a separate build directory
+        # We'll use this as our working directory for all subsequent commands
+        run: cmake -E make_directory ${{runner.workspace}}/build
+
+      - name: ccache cache files
+        uses: actions/cache@v2
+        with:
+          path: ${{runner.workspace}}/.ccache
+          key: ${{ matrix.config.name }}-ccache-${{ steps.ccache_cache_timestamp.outputs.timestamp }}
+          restore-keys: |
+            ${{ matrix.config.name }}-ccache-
+
+      # Set up the paths for ccache and control the size under 400MB
+      - name: Configure ccache
+        shell: cmake -P {0}
+        run: |
+          file(TO_CMAKE_PATH ${{runner.workspace}} ccache_basedir)
+          set(ENV{CCACHE_BASEDIR} "${ccache_basedir}")
+          set(ENV{CCACHE_DIR} "${ccache_basedir}/.ccache")
+          set(ENV{CCACHE_COMPRESS} "true")
+          set(ENV{CCACHE_COMPRESSLEVEL} "6")
+          set(ENV{CCACHE_MAXSIZE} "400M")
+
+          execute_process(COMMAND ccache -p)
+          execute_process(COMMAND ccache -z)
+
+      - name: Configure CMake
+        # Use a bash shell so we can use the same syntax for environment variable
+        # access regardless of the host operating system
+        shell: bash
+        working-directory: ${{runner.workspace}}/build
+        # Note the current convention is to use the -S and -B options here to specify source
+        # and build directories, but this is only available with CMake 3.13 and higher.
+        # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
+        run: |
+          export CC=${{ matrix.config.cc }}
+          export CXX=${{ matrix.config.cxx }}
+          cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+
+      - name: Build
+        working-directory: ${{runner.workspace}}/build
+        shell: bash
+        # Execute the build.  You can specify a specific target with "--target <NAME>"
+        run: |
+          cmake --build . --config $BUILD_TYPE
+
+      # Check the cache size and see if it is over the limit
+      - name: Check ccache size
+        shell: cmake -P {0}
+        run: |
+          execute_process(COMMAND ccache -s)
+
+      - name: ${{matrix.config.name}}
+        if: contains(matrix.config.name, 'Regression Test')
+        shell: bash
+        # Execute the test.
+        run: source ./.github/workflows/${{matrix.config.reg_script}}
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 000000000..bfce9fc79
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,68 @@
+name: Build docker CI images
+on:
+  - workflow_dispatch
+jobs:
+  base_images:
+    name: Push Docker images
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+      - name: Build base
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./docker/Dockerfile.base
+          push: true
+          tags: ghcr.io/lnis-uofu/openfpga-build-base:latest
+      - name: Build environment image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./docker/Dockerfile.env
+          push: true
+          tags: ghcr.io/lnis-uofu/openfpga-env:latest
+  compiler_images:
+    name: Build ${{ matrix.compiler }} compiler image
+    needs: base_images
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler:
+          - gcc-5
+          - gcc-6
+          - gcc-7
+          - gcc-8
+          - gcc-9
+          - clang-6.0
+          - clang-8
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+      - name: Build ${{ matrix.compiler }} image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./docker/Dockerfile.${{ matrix.compiler }}
+          push: true
+          tags: ghcr.io/lnis-uofu/openfpga-build-${{ matrix.compiler }}:latest
diff --git a/.github/workflows/install_dependencies_build.sh b/.github/workflows/install_dependencies_build.sh
new file mode 100644
index 000000000..3f6ef089e
--- /dev/null
+++ b/.github/workflows/install_dependencies_build.sh
@@ -0,0 +1,40 @@
+apt-get update && apt-get install -y \
+    autoconf \
+    automake \
+    bison \
+    ccache \
+    cmake \
+    ctags \
+    curl \
+    doxygen \
+    flex \
+    fontconfig \
+    gdb \
+    git \
+    gperf \
+    iverilog \
+    libc6-dev \
+    libcairo2-dev \
+    libevent-dev \
+    libffi-dev \
+    libfontconfig1-dev \
+    liblist-moreutils-perl \
+    libncurses5-dev \
+    libreadline-dev \
+    libx11-dev \
+    libxft-dev \
+    libxml++2.6-dev \
+    make \
+    perl \
+    pkg-config \
+    python3 \
+    python3-setuptools \
+    python3-lxml \
+    python3-pip \
+    qt5-default \
+    tcllib \
+    tcl8.6-dev \
+    texinfo \
+    time \
+    valgrind \
+    zip
diff --git a/.github/workflows/install_dependencies_run.sh b/.github/workflows/install_dependencies_run.sh
new file mode 100644
index 000000000..2654f648c
--- /dev/null
+++ b/.github/workflows/install_dependencies_run.sh
@@ -0,0 +1,2 @@
+apt-get update && apt-get install --no-install-recommends -y libdatetime-perl iverilog python3-pip git \
+    libc6 libffi6 libgcc1 libreadline7 libstdc++6 libtcl8.6 python3 zlib1g libbz2-1.0 rsync
diff --git a/.github/workflows/install_dependency.sh b/.github/workflows/install_dependency_old.sh
similarity index 100%
rename from .github/workflows/install_dependency.sh
rename to .github/workflows/install_dependency_old.sh
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index 20a5e480d..808aaa18b 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -1,6 +1,6 @@
 name: "Pull Request Labeler"
 on:
-- pull_request_target
+  - pull_request_target
 
 jobs:
   triage:
diff --git a/.gitignore b/.gitignore
index 830a45dd3..4fdc97134 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,5 @@ build/
 
 message.txt
 deploy_key
+openfpga/openfpga
+vpr/vpr
diff --git a/docker/Dockerfile.base b/docker/Dockerfile.base
new file mode 100755
index 000000000..c635bd4c0
--- /dev/null
+++ b/docker/Dockerfile.base
@@ -0,0 +1,9 @@
+FROM ubuntu:18.04
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install software-properties-common -y
+# 18.04 includes 2.17 but github requires 2.18+ to support submodules.
+RUN add-apt-repository ppa:git-core/ppa
+ADD .github/workflows/install_dependencies_build.sh install_dependencies_build.sh
+RUN bash install_dependencies_build.sh
+ADD requirements.txt requirements.txt
+RUN python3 -m pip install -r requirements.txt
diff --git a/docker/Dockerfile.clang-6.0 b/docker/Dockerfile.clang-6.0
new file mode 100644
index 000000000..6d7c36b3e
--- /dev/null
+++ b/docker/Dockerfile.clang-6.0
@@ -0,0 +1,2 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get update && apt-get install -y clang-format-7 clang-6.0
diff --git a/docker/Dockerfile.clang-8 b/docker/Dockerfile.clang-8
new file mode 100644
index 000000000..5a4a5f4ef
--- /dev/null
+++ b/docker/Dockerfile.clang-8
@@ -0,0 +1,2 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get update && apt-get install -y clang-format-7 clang-8
diff --git a/docker/Dockerfile.env b/docker/Dockerfile.env
new file mode 100644
index 000000000..b0221231f
--- /dev/null
+++ b/docker/Dockerfile.env
@@ -0,0 +1,9 @@
+FROM ubuntu:18.04
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install --no-install-recommends software-properties-common -y
+# 18.04 includes 2.17 but github requires 2.18+ to support submodules.
+RUN add-apt-repository ppa:git-core/ppa
+ADD .github/workflows/install_dependencies_run.sh install_dependencies_run.sh
+RUN bash install_dependencies_run.sh
+ADD requirements.txt requirements.txt
+RUN python3 -m pip install -r requirements.txt
\ No newline at end of file
diff --git a/docker/Dockerfile.gcc-5 b/docker/Dockerfile.gcc-5
new file mode 100644
index 000000000..f1ee75572
--- /dev/null
+++ b/docker/Dockerfile.gcc-5
@@ -0,0 +1,2 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get update && apt-get install -y gcc-5 g++-5
diff --git a/docker/Dockerfile.gcc-6 b/docker/Dockerfile.gcc-6
new file mode 100644
index 000000000..89ae008f2
--- /dev/null
+++ b/docker/Dockerfile.gcc-6
@@ -0,0 +1,2 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get update && apt-get install -y gcc-6 g++-6
diff --git a/docker/Dockerfile.gcc-7 b/docker/Dockerfile.gcc-7
new file mode 100644
index 000000000..d7638677b
--- /dev/null
+++ b/docker/Dockerfile.gcc-7
@@ -0,0 +1,2 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get update && apt-get install -y gcc-7 g++-7
diff --git a/docker/Dockerfile.gcc-8 b/docker/Dockerfile.gcc-8
new file mode 100644
index 000000000..187a47623
--- /dev/null
+++ b/docker/Dockerfile.gcc-8
@@ -0,0 +1,2 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get update && apt-get install -y gcc-8 g++-8
diff --git a/docker/Dockerfile.gcc-9 b/docker/Dockerfile.gcc-9
new file mode 100644
index 000000000..b6df13651
--- /dev/null
+++ b/docker/Dockerfile.gcc-9
@@ -0,0 +1,4 @@
+FROM ghcr.io/lnis-uofu/openfpga-build-base
+RUN apt-get install -y software-properties-common
+RUN add-apt-repository ppa:ubuntu-toolchain-r/test
+RUN apt-get update && apt-get install -y gcc-9 g++-9
diff --git a/docker/Dockerfile.master b/docker/Dockerfile.master
new file mode 100644
index 000000000..866f8b51b
--- /dev/null
+++ b/docker/Dockerfile.master
@@ -0,0 +1,14 @@
+FROM ghcr.io/lnis-uofu/openfpga-env
+RUN mkdir /opt/openfpga /opt/openfpga/openfpga /opt/openfpga/abc /opt/openfpga/ace2 /opt/openfpga/vpr /opt/openfpga/yosys
+COPY openfpga/openfpga /opt/openfpga/openfpga/openfpga
+COPY abc/abc /opt/openfpga/abc/
+COPY ace2/ace /opt/openfpga/ace2/
+COPY vpr/vpr /opt/openfpga/vpr/
+COPY yosys/yosys yosys/yosys-abc yosys/yosys-config yosys/yosys-filterlib yosys/yosys-smtbmc /opt/openfpga/yosys/
+COPY yosys/share /opt/openfpga/yosys/share
+RUN cd /opt/openfpga && chmod +x abc/abc ace2/ace openfpga/openfpga vpr/vpr yosys/yosys yosys/yosys-abc yosys/yosys-config yosys/yosys-filterlib yosys/yosys-smtbmc
+COPY openfpga_flow /opt/openfpga/openfpga_flow
+COPY openfpga.sh /opt/openfpga/openfpga.sh
+ENV PATH="/opt/openfpga/openfpga:/opt/openfpga/yosys:/opt/openfpga/ace2:/opt/openfpga/abc:/opt/openfpga/vpr:${PATH}"
+ENV OPENFPGA_PATH="/opt/openfpga"
+WORKDIR /opt/openfpga