From 2ec4c2cdb17d57b99df704c07f11c264b5ddd4f1 Mon Sep 17 00:00:00 2001
From: itchyny <itchyny@cybozu.co.jp>
Date: Sun, 1 Nov 2026 20:34:20 +0900
Subject: [PATCH] Switch Linux runners to Ubuntu 26.04 except for MIPS (#3703)

The i386 build ran on ubuntu-22.04, which is retired on April 17, 2027,
and ubuntu-24.04 lacks fmod and exp10 in the static i386 libm.

Build on ubuntu-26.04 for every architecture except MIPS, whose cross
toolchains Ubuntu 26.04 no longer ships, and move the decnum, oniguruma
and valgrind workflows too. Most release binaries are now built with
GCC 15 and glibc 2.43, and they remain statically linked.
---
 .github/workflows/ci.yml        | 8 ++++++--
 .github/workflows/decnum.yml    | 2 +-
 .github/workflows/oniguruma.yml | 4 ++--
 .github/workflows/valgrind.yml  | 2 +-
 4 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b6e3d98e..ea304fe2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,6 +37,8 @@ jobs:
             CC: aarch64-linux-gnu
           - arch: armel
             CC: arm-linux-gnueabi
+            # Ubuntu 26.04 has no crossbuild-essential-armel
+            packages: gcc-arm-linux-gnueabi libc6-dev-armel-cross
           - arch: armhf
             CC: arm-linux-gnueabihf
           - arch: i386
@@ -65,7 +67,8 @@ jobs:
             CC: riscv64-linux-gnu
           - arch: s390x
             CC: s390x-linux-gnu
-    runs-on: ${{ matrix.arch == 'i386' && 'ubuntu-22.04' || 'ubuntu-24.04' }}
+    # Ubuntu 26.04 no longer ships the MIPS cross toolchains.
+    runs-on: ${{ startsWith(matrix.arch, 'mips') && 'ubuntu-24.04' || 'ubuntu-26.04' }}
     env:
       AR: ${{ matrix.CC }}-ar
       CHOST: ${{ matrix.CC }}
@@ -81,7 +84,8 @@ jobs:
       - name: Install packages
         run: |
           sudo apt-get update
-          sudo apt-get install -y automake autoconf libtool crossbuild-essential-${{ matrix.arch }}
+          sudo apt-get install -y automake autoconf libtool \
+            ${{ matrix.packages || format('crossbuild-essential-{0}', matrix.arch) }}
       - name: Build
         run: |
           autoreconf -i
diff --git a/.github/workflows/decnum.yml b/.github/workflows/decnum.yml
index 4f7af7a0..364f1413 100644
--- a/.github/workflows/decnum.yml
+++ b/.github/workflows/decnum.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   disabled:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v7
diff --git a/.github/workflows/oniguruma.yml b/.github/workflows/oniguruma.yml
index 47ed62c5..c46b50bd 100644
--- a/.github/workflows/oniguruma.yml
+++ b/.github/workflows/oniguruma.yml
@@ -9,7 +9,7 @@ on:
 # we test other options for --with-oniguruma here.
 jobs:
   installed:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v7
@@ -42,7 +42,7 @@ jobs:
             tests/*.log
 
   disabled:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v7
diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
index 0d068ce3..42e50d3b 100644
--- a/.github/workflows/valgrind.yml
+++ b/.github/workflows/valgrind.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   linux:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v7