github: update to ARM Embedded GCC 9

GCC 9 is fairly stable now. Also this is first version that is signed
and notarized for macOS making it the only version that runs on macOS.

Previous builds of the toolchain were built with -O0, so this version
can compile twice as fast and also reduces firmware size a bit.

Author: dlech

.github/workflows/build.yml

@@ -162,14 +162,14 @@ jobs:
       id: check-cache
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Download
       if: steps.check-cache.outputs.cache-hit != 'true'
-      uses: fiam/arm-none-eabi-gcc@v1
+      uses: fiam/arm-none-eabi-gcc@v1.0.2
       with:
-        release: '8-2019-q3'
-        directory: ${{ runner.tool_cache }}/gcc-arm
+        release: '9-2020-q2'
+        directory: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
 
   cityhub_firmware:
     name: cityhub firmware
@@ -179,10 +179,10 @@ jobs:
     - name: Install cross-compiler
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Add cross-compiler to path
-      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
     - name: Checkout repo
       uses: actions/checkout@v2
       with:
@@ -223,10 +223,10 @@ jobs:
     - name: Install cross-compiler
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Add cross-compiler to path
-      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
     - name: Checkout repo
       uses: actions/checkout@v2
       with:
@@ -267,10 +267,10 @@ jobs:
     - name: Install cross-compiler
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Add cross-compiler to path
-      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
     - name: Checkout repo
       uses: actions/checkout@v2
       with:
@@ -311,10 +311,10 @@ jobs:
     - name: Install cross-compiler
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Add cross-compiler to path
-      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
     - name: Checkout repo
       uses: actions/checkout@v2
       with:
@@ -355,10 +355,10 @@ jobs:
     - name: Install cross-compiler
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Add cross-compiler to path
-      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
     - name: Checkout repo
       uses: actions/checkout@v2
       with:
@@ -387,10 +387,10 @@ jobs:
     - name: Install cross-compiler
       uses: actions/cache@v1
       with:
-        path: ${{ runner.tool_cache }}/gcc-arm
-        key: gcc-arm
+        path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+        key: gcc-arm-9-2020-q2
     - name: Add cross-compiler to path
-      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+      run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
     - name: Checkout repo
       uses: actions/checkout@v2
       with:

.github/workflows/release.yml

@@ -17,16 +17,16 @@ jobs:
         id: check-cache
         uses: actions/cache@v1
         with:
-          path: ${{ runner.tool_cache }}/gcc-arm
-          key: gcc-arm
+          path: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
+          key: gcc-arm-9-2020-q2
       - name: Download
         if: steps.check-cache.outputs.cache-hit != 'true'
-        uses: fiam/arm-none-eabi-gcc@v1
+        uses: fiam/arm-none-eabi-gcc@v1.0.2
         with:
-          release: '8-2019-q3'
-          directory: ${{ runner.tool_cache }}/gcc-arm
+          release: '9-2020-q2'
+          directory: ${{ runner.tool_cache }}/gcc-arm-9-2020-q2
       - name: Add cross-compiler to path
-        run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm/bin
+        run: echo ::add-path::${{ runner.tool_cache }}/gcc-arm-9-2020-q2/bin
       - name: Checkout code
         uses: actions/checkout@v2
         with:

CONTRIBUTING.md

@@ -12,7 +12,7 @@ This is the recommended development environment used by the Pybricks maintainers
 - [Python][python] v3.8.x
 - [Poetry][poetry] v1.x
 - [Uncrustify][uncrustify] v0.71.x
-- [GNU ARM Embedded Toolchain][arm-gcc] v8-2019-q3
+- [GNU ARM Embedded Toolchain][arm-gcc] v9-2020-q2
 - [GNU GCC][gcc] for host operating system
 - [GNU Make][make]