Add CI jobs that test with GCC 11.

.github/workflows/ci.yml

@@ -29,6 +29,14 @@ jobs:
         env: [{}]
 
         include:
+          - python-version: 3.9
+            backend: c
+            env: { GCC_VERSION: 11 }
+            allowed_failure: true
+          - python-version: 3.9
+            backend: cpp
+            env: { GCC_VERSION: 11 }
+            allowed_failure: true
           # Temporary - Allow failure on all 3.10-dev jobs until beta comes out
           - python-version: 3.10-dev
             allowed_failure: true
@@ -121,6 +129,7 @@ jobs:
       BACKEND: ${{ matrix.backend }}
       OS_NAME: ${{ matrix.os }}
       PYTHON_VERSION: ${{ matrix.python-version }}
+      GCC_VERSION: 8
       USE_CCACHE: 1
       CCACHE_SLOPPINESS: "pch_defines,time_macros"
       CCACHE_COMPRESS: 1

Tools/ci-run.sh

 #!/usr/bin/bash
 
+GCC_VERSION=${GCC_VERSION:=8}
+
 # Set up compilers
 if [ "${OS_NAME##ubuntu*}" == "" - "$TEST_CODE_STYLE" != "1" ]; then
   echo "Installing requirements [apt]"
   sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
   sudo apt update -y -q
-  sudo apt install -y -q ccache gdb python-dbg python3-dbg gcc-8 || exit 1
+  sudo apt install -y -q ccache gdb python-dbg python3-dbg gcc-$GCC_VERSION || exit 1
   if [ -z "${BACKEND##*cpp*}" ]; then
-    sudo apt install -y -q g++-8 || exit 1
+    sudo apt install -y -q g++-$GCC_VERSION || exit 1
   fi
   sudo /usr/sbin/update-ccache-symlinks
   echo "/usr/lib/ccache" >> $GITHUB_PATH # export ccache to path
 
-  sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 60 $(if [ -z "${BACKEND##*cpp*}" ]; then echo " --slave /usr/bin/g++ g++ /usr/bin/g++-8"; fi)
+  sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-$GCC_VERSION 60 $(if [ -z "${BACKEND##*cpp*}" ]; then echo " --slave /usr/bin/g++ g++ /usr/bin/g++-$GCC_VERSION"; fi)
 
   export CC="gcc"
   if [ -z "${BACKEND##*cpp*}" ]; then
-    sudo update-alternatives --set g++ /usr/bin/g++-8
+    sudo update-alternatives --set g++ /usr/bin/g++-$GCC_VERSION
     export CXX="g++"
   fi
 fi