From 1dec702c8676fef3a7b5850e5350102876067680 Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Wed, 5 Jun 2024 22:35:48 +0200
Subject: [PATCH] cmake: bring `curl-config.cmake` closer to `FindCURL`
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Set `CURL_LIBRARIES` and `CURL_INCLUDE_DIRS` variables
for compatibility with CMake's `FindCURL.cmake`:
https://github.com/Kitware/CMake/blob/b411d0146c2e06acfb0c823bb039e99f0191b611/Modules/FindCURL.cmake#L209

For dependent projects, CMake's suggestion is to replace
`CURL_LIBRARIES` with `CURL::libcurl`, and drop `CURL_INCLUDE_DIRS`.

Reported-by: Aurélien Pierre
Ref: https://curl.se/mail/lib-2024-06/0014.html
Ref: https://gitlab.kitware.com/cmake/cmake/-/issues/24580
Closes #13897
---
 CMake/curl-config.cmake.in | 4 ++++
 CMakeLists.txt             | 1 +
 2 files changed, 5 insertions(+)

diff --git a/CMake/curl-config.cmake.in b/CMake/curl-config.cmake.in
index 9adb96e0aa..2ce8625ef9 100644
--- a/CMake/curl-config.cmake.in
+++ b/CMake/curl-config.cmake.in
@@ -38,3 +38,7 @@ check_required_components("@PROJECT_NAME@")
 if(NOT TARGET @PROJECT_NAME@::libcurl)
   add_library(@PROJECT_NAME@::libcurl ALIAS @PROJECT_NAME@::@LIB_SELECTED@)
 endif()
+
+# For compatibility with CMake's FindCURL.cmake
+set(CURL_LIBRARIES @PROJECT_NAME@::libcurl)
+set_and_check(CURL_INCLUDE_DIRS "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@")
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ebbe2b1a1d..c939df914c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1855,6 +1855,7 @@ if(NOT CURL_DISABLE_INSTALL)
   configure_package_config_file(CMake/curl-config.cmake.in
     "${project_config}"
     INSTALL_DESTINATION ${CURL_INSTALL_CMAKE_DIR}
+    PATH_VARS CMAKE_INSTALL_INCLUDEDIR
   )
 
   if(CURL_ENABLE_EXPORT_TARGET)
-- 
2.47.3