From c421c3e3251b33e78b1c98030d92e6ad23a82d03 Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Sun, 30 Nov 2025 23:22:59 +0100
Subject: [PATCH] cmake: verify minimum CMake version in `curl-config.cmake`

Show a message if the CMake version is lower than that when consuming
libcurl via the CMake config.

The minimum CMake version on consumption is for now the same as
the minimum required (v3.7) to build curl itself.

Ref: https://cmake.org/cmake/help/v3.7/variable/CMAKE_MINIMUM_REQUIRED_VERSION.html
Ref: #18704 (discussion)
Follow-up to 16f073ef49f94412000218c9f6ad04e3fd7e4d01 #16973
Closes #19776
---
 CMake/curl-config.cmake.in | 5 +++++
 CMakeLists.txt             | 1 +
 2 files changed, 6 insertions(+)

diff --git a/CMake/curl-config.cmake.in b/CMake/curl-config.cmake.in
index 7ae026d8f8..7f346c832c 100644
--- a/CMake/curl-config.cmake.in
+++ b/CMake/curl-config.cmake.in
@@ -26,6 +26,11 @@
 option(CURL_USE_PKGCONFIG "Enable pkg-config to detect @PROJECT_NAME@ dependencies. Default: @CURL_USE_PKGCONFIG@"
   "@CURL_USE_PKGCONFIG@")
 
+if(CMAKE_VERSION VERSION_LESS @CMAKE_MINIMUM_REQUIRED_VERSION@)
+  message(STATUS "@PROJECT_NAME@: @PROJECT_NAME@-specific Find modules require "
+    "CMake @CMAKE_MINIMUM_REQUIRED_VERSION@ or upper, found: ${CMAKE_VERSION}.")
+endif()
+
 include(CMakeFindDependencyMacro)
 
 if("@USE_OPENSSL@")
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5bcf0b6a63..b45e7859e0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2309,6 +2309,7 @@ if(NOT CURL_DISABLE_INSTALL)
     ${_generated_version_config}")
 
   # Consumed custom variables:
+  #   CMAKE_MINIMUM_REQUIRED_VERSION
   #   CURLVERSION
   #   LIBCURL_PC_LIBS_PRIVATE_LIST
   #   LIB_NAME