[WIP] Upgrade Ubuntu from 24.04 to 26.06 in GitHub Actions

Touch Python/getcompiler.c to trigger most GHA jobs.

Author: vstinner

.github/workflows/build.yml

@@ -53,7 +53,7 @@ jobs:
     name: 'Check if Autoconf files are up to date'
     # Don't use ubuntu-latest but a specific version to make the job
     # reproducible: to get the same tools versions (autoconf, aclocal, ...)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     container:
       image: ghcr.io/python/autoconf:2025.01.02.12581854023
     timeout-minutes: 60
@@ -96,7 +96,7 @@ jobs:
     name: 'Check if generated files are up to date'
     # Don't use ubuntu-latest but a specific version to make the job
     # reproducible: to get the same tools versions (autoconf, aclocal, ...)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
@@ -239,18 +239,18 @@ jobs:
         - false
         - true
         os:
-        - ubuntu-24.04
-        - ubuntu-24.04-arm
+        - ubuntu-26.04
+        - ubuntu-26.04-arm
         exclude:
         # Do not test BOLT with free-threading, to conserve resources
         - bolt: true
           free-threading: true
         # BOLT currently crashes during instrumentation on aarch64
-        - os: ubuntu-24.04-arm
+        - os: ubuntu-26.04-arm
           bolt: true
         include:
         # Enable CPU-intensive tests on ARM (default build only)
-        - os: ubuntu-24.04-arm
+        - os: ubuntu-26.04-arm
           bolt: false
           free-threading: false
           test-opts: '-u cpu'
@@ -270,7 +270,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04]
+        os: [ubuntu-26.04]
         ssllib:
           # See Tools/ssl/make_ssl_data.py for notes on adding a new version
           ## OpenSSL
@@ -346,7 +346,7 @@ jobs:
           - arch: aarch64
             runs-on: macos-26
           - arch: x86_64
-            runs-on: ubuntu-24.04
+            runs-on: ubuntu-26.04
 
     runs-on: ${{ matrix.runs-on }}
     steps:
@@ -393,7 +393,7 @@ jobs:
 
   test-hypothesis:
     name: "Hypothesis tests on Ubuntu"
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     needs: build-context
     if: needs.build-context.outputs.run-ubuntu == 'true'
@@ -504,7 +504,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04]
+        os: [ubuntu-26.04]
     env:
       OPENSSL_VER: 3.5.7
       PYTHONSTRICTEXTENSIONBUILD: 1

.github/workflows/jit.yml

@@ -29,7 +29,7 @@ env:
 jobs:
   interpreter:
     name: Interpreter (Debug)
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -145,9 +145,9 @@ jobs:
           - false
         include:
           - target: x86_64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04
+            runner: ubuntu-26.04
           - target: aarch64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04-arm
+            runner: ubuntu-26.04-arm
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
@@ -171,7 +171,7 @@ jobs:
   linux-extras:
     name: ${{ matrix.name }}
 
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     strategy:
       fail-fast: false

.github/workflows/reusable-docs.yml

@@ -95,7 +95,7 @@ jobs:
   # Run "doctest" on HEAD as new syntax doesn't exist in the latest stable release
   doctest:
     name: 'Doctest'
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

.github/workflows/reusable-emscripten.yml

@@ -12,7 +12,7 @@ env:
 jobs:
   build-emscripten-reusable:
     name: 'build and test'
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 40
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

.github/workflows/reusable-san.yml

@@ -26,7 +26,7 @@ jobs:
         && ' (free-threading)'
         || ''
       }}
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     timeout-minutes: 60
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

.github/workflows/reusable-wasi.yml

@@ -12,7 +12,7 @@ env:
 jobs:
   build-wasi-reusable:
     name: 'build and test'
-    runs-on: ubuntu-24.04-arm
+    runs-on: ubuntu-26.04-arm
     timeout-minutes: 60
     env:
       WASMTIME_VERSION: 38.0.3

.github/workflows/tail-call.yml

@@ -66,13 +66,13 @@ jobs:
       matrix:
         include:
           - target: x86_64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04
+            runner: ubuntu-26.04
             configure_flags: --with-pydebug
           - target: x86_64-unknown-linux-gnu/gcc-free-threading
-            runner: ubuntu-24.04
+            runner: ubuntu-26.04
             configure_flags: --disable-gil
           - target: aarch64-unknown-linux-gnu/gcc
-            runner: ubuntu-24.04-arm
+            runner: ubuntu-26.04-arm
             configure_flags: --with-pydebug
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

Python/getcompiler.c

@@ -24,6 +24,7 @@
 
 #endif /* !COMPILER */
 
+
 const char *
 Py_GetCompiler(void)
 {