From 48939a4575d5db6e875add0ccae93242f56fe581 Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Fri, 28 Nov 2025 01:23:57 +0100
Subject: [PATCH] GHA/linux-old: add support for using custom CMake versions

Install CMake from the Kitware GitHub release archive. To allow choosing
its version independently from the OS.

Switch to 3.7.0 (from 3.7.2) to test the earliest supported version.
Also tested OK with 3.18.4 and 3.7.2.

The download and install step takes 1-2 seconds.

Follow-up to c9e50e9e393508c6a28c695abcf62980b3c1b023 #19737

Closes #19738
---
 .github/workflows/linux-old.yml | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/linux-old.yml b/.github/workflows/linux-old.yml
index 59da60987c..e282b1c471 100644
--- a/.github/workflows/linux-old.yml
+++ b/.github/workflows/linux-old.yml
@@ -60,6 +60,8 @@ jobs:
     runs-on: 'ubuntu-latest'
     container: 'debian:stretch'
 
+    env:
+      CMAKE_VERSION: '3.7.0'  # Earliest version supported by curl
     steps:
       - name: 'install prereqs'
         # Remember, this shell is dash, not bash
@@ -72,7 +74,7 @@ jobs:
           dpkg -i freexian-archive-keyring_2022.06.08_all.deb
           echo 'deb http://deb.freexian.com/extended-lts stretch-lts main contrib non-free' | tee /etc/apt/sources.list.d/extended-lts.list
           apt-get -o Dpkg::Use-Pty=0 update
-          apt-get -o Dpkg::Use-Pty=0 install -y --no-install-suggests --no-install-recommends cmake make automake autoconf libtool gcc pkg-config libpsl-dev libzstd-dev zlib1g-dev libc-ares-dev libkrb5-dev libldap2-dev librtmp-dev stunnel4
+          apt-get -o Dpkg::Use-Pty=0 install -y --no-install-suggests --no-install-recommends make automake autoconf libtool gcc pkg-config libpsl-dev libzstd-dev zlib1g-dev libc-ares-dev libkrb5-dev libldap2-dev librtmp-dev stunnel4
           # GitHub's actions/checkout needs newer glibc and libstdc++. The latter also depends on
           # gcc-8-base, but it does not actually seem used in our situation and is not available in
           # the main repo, so force the install.
@@ -80,6 +82,15 @@ jobs:
           httrack --get https://deb.freexian.com/extended-lts/pool/main/g/gcc-8/libstdc++6_8.3.0-6_amd64.deb
           dpkg -i --force-depends libc6_*_amd64.deb libstdc++6_*_amd64.deb
 
+      - name: 'install prereqs (cmake)'
+        run: |
+          cd ~
+          fn="cmake-${CMAKE_VERSION}-linux-x86_64"
+          httrack --get "https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/${fn}.tar.gz"
+          tar -xf "${fn}".tar*.gz
+          rm -f "${fn}".tar*.gz
+          mv "cmake-${CMAKE_VERSION}-Linux-x86_64" cmake
+
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           persist-credentials: false
@@ -88,7 +99,7 @@ jobs:
         run: |
           mkdir bld-1
           cd bld-1
-          cmake .. -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON -DBUILD_SHARED_LIBS=ON \
+          "$HOME"/cmake/bin/cmake .. -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON -DBUILD_SHARED_LIBS=ON \
             -DCURL_ENABLE_SSL=OFF -DENABLE_ARES=OFF -DCURL_ZSTD=OFF -DCURL_USE_GSSAPI=OFF -DCURL_USE_LIBSSH2=OFF -DCURL_USE_LIBSSH=OFF -DUSE_LIBRTMP=ON
 
       - name: 'CM build-only build'
@@ -112,7 +123,7 @@ jobs:
         run: |
           mkdir bld-cares
           cd bld-cares
-          cmake .. -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON -DBUILD_SHARED_LIBS=ON \
+          "$HOME"/cmake/bin/cmake .. -DCMAKE_UNITY_BUILD=ON -DCURL_WERROR=ON -DBUILD_SHARED_LIBS=ON \
             -DCURL_ENABLE_SSL=OFF -DENABLE_ARES=ON -DCURL_USE_GSSAPI=ON -DCURL_USE_LIBSSH2=OFF -DCURL_USE_LIBSSH=OFF -DUSE_LIBRTMP=ON \
             -DCURL_LIBCURL_VERSIONED_SYMBOLS=ON
 
-- 
2.47.3