Updated GitHub workflow for gcc tests.

gcc 9 got recently removed from the default ubuntu 22 image.
Use this chance to update to ubuntu 24.

Author: Sedeniono

.github/workflows/test_gcc_linux.yml

@@ -1,66 +1,64 @@
-name: gcc linux
-
-on:
-  push:
-  pull_request:
-  workflow_dispatch:
-  schedule:
-    - cron: '20 3 * * *'
-
-
-env:
-  TEST_DIR: ./tests
-
-
-jobs:
-  all:
-    strategy:
-      fail-fast: false
-      matrix:
-        gcc_version: [9, 11, 13]
-        cpp_version: [c++17, c++20]
-        arch: [m64, m32] # 64 and 32 bit
-        buildmode: [~ ,  -O3 -DNDEBUG,  -O3 -DNDEBUG -ffast-math]
-        
-        # gcc 9 does not support C++20
-        exclude:
-          - gcc_version: 9
-            cpp_version: c++20
-
-        # Also include a few variations with disabled UB tricks (not for all to limit resource consumption).
-        include:
-        - gcc_version: 13
-          cpp_version: c++20
-          arch: m64
-          buildmode: -DTINY_OPTIONAL_USE_SEPARATE_BOOL_INSTEAD_OF_UB_TRICKS
-
-    runs-on: ubuntu-22.04
-    timeout-minutes: 20
-
-    steps:
-    - uses: actions/checkout@v4
-
-    # gcc 13 was removed from the runner (https://github.com/actions/runner-images/issues/9679), so install it manually.
-    - name: Install gcc 13 if required
-      if: ${{ matrix.gcc_version == 13 }}
-      run: |
-        sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-        sudo apt update -y
-        sudo apt install g++-13
-
-    - name: Install gcc-multilib for x86 if required
-      # Creating a 32 bit executable on a 64 bit OS requires the gcc multilib. 
-      # It is not installed by default on the github runner.
-      if: ${{ matrix.arch == 'm32' }}
-      run: |
-        sudo apt update
-        sudo apt install ${{ format('gcc-{0}-multilib g++-{0}-multilib', matrix.gcc_version) }} -y 
-
-    - name: Build and run tests
-      working-directory: ${{env.TEST_DIR}}
-      env:
-        CXX: ${{ format('g++-{0}', matrix.gcc_version) }}
-        ADDITIONAL_FLAGS: ${{ format('-{0} -std={1} {2}', matrix.arch, matrix.cpp_version, matrix.buildmode) }}
-      run: make generic
-
-
+name: gcc linux
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: '20 3 * * *'
+
+
+env:
+  TEST_DIR: ./tests
+
+
+jobs:
+  all:
+    strategy:
+      fail-fast: false
+      matrix:
+        gcc_version: [9, 11, 13, 14, 15]
+        cpp_version: [c++17, c++20]
+        arch: [m64, m32] # 64 and 32 bit
+        buildmode: [~ ,  -O3 -DNDEBUG,  -O3 -DNDEBUG -ffast-math]
+        
+        # gcc 9 does not support C++20
+        exclude:
+          - gcc_version: 9
+            cpp_version: c++20
+
+        # Also include a few variations with disabled UB tricks (not for all to limit resource consumption).
+        include:
+        - gcc_version: 13
+          cpp_version: c++20
+          arch: m64
+          buildmode: -DTINY_OPTIONAL_USE_SEPARATE_BOOL_INSTEAD_OF_UB_TRICKS
+
+    runs-on: ubuntu-24.04
+    timeout-minutes: 20
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install gcc
+      run: |
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
+        sudo apt update -y
+        sudo apt install $({{ format('gcc-{0} g++-{0}', matrix.gcc_version) }}) -y
+
+    - name: Install gcc-multilib for x86 if required
+      # Creating a 32 bit executable on a 64 bit OS requires the gcc multilib. 
+      # It is not installed by default on the github runner.
+      if: ${{ matrix.arch == 'm32' }}
+      run: |
+        sudo apt update -y
+        sudo apt install ${{ format('gcc-{0}-multilib g++-{0}-multilib', matrix.gcc_version) }} -y 
+
+    - name: Build and run tests
+      working-directory: ${{env.TEST_DIR}}
+      env:
+        CXX: ${{ format('g++-{0}', matrix.gcc_version) }}
+        ADDITIONAL_FLAGS: ${{ format('-{0} -std={1} {2}', matrix.arch, matrix.cpp_version, matrix.buildmode) }}
+      run: make generic
+
+