From 920364ca878b10caeaafb64c5a4a73b23d3b4a93 Mon Sep 17 00:00:00 2001
From: Caleb Xu <calebcenter@live.com>
Date: Wed, 15 May 2024 19:53:26 -0400
Subject: [PATCH] formula: trap CMake FetchContent usage instead of using
 FETCHCONTENT_FULLY_DISCONNECTED

---
 .../cmake/trap_fetchcontent_provider.cmake       | 16 ++++++++++++++++
 Library/Homebrew/formula.rb                      |  2 +-
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 Library/Homebrew/cmake/trap_fetchcontent_provider.cmake

diff --git a/Library/Homebrew/cmake/trap_fetchcontent_provider.cmake b/Library/Homebrew/cmake/trap_fetchcontent_provider.cmake
new file mode 100644
index 0000000000000..522a5d4a27632
--- /dev/null
+++ b/Library/Homebrew/cmake/trap_fetchcontent_provider.cmake
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.24) # Dependency providers introduced in CMake 3.24
+
+option(HOMEBREW_ALLOW_FETCHCONTENT "Allow FetchContent to be used in Homebrew builds" OFF)
+
+if (HOMEBREW_ALLOW_FETCHCONTENT)
+    return()
+endif()
+
+macro(trap_fetchcontent_provider method depName)
+    message(FATAL_ERROR "Refusing to populate dependency '${depName}' with FetchContent while building in Homebrew, please use a formula dependency or add a resource to the formula.")
+endmacro()
+
+cmake_language(
+    SET_DEPENDENCY_PROVIDER trap_fetchcontent_provider
+    SUPPORTED_METHODS FETCHCONTENT_MAKEAVAILABLE_SERIAL
+)
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index f5dc392fd1544..9a884e963fd99 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1808,7 +1808,7 @@ def std_cmake_args(install_prefix: prefix, install_libdir: "lib", find_framework
       -DCMAKE_BUILD_TYPE=Release
       -DCMAKE_FIND_FRAMEWORK=#{find_framework}
       -DCMAKE_VERBOSE_MAKEFILE=ON
-      -DFETCHCONTENT_FULLY_DISCONNECTED=ON
+      -DCMAKE_PROJECT_TOP_LEVEL_INCLUDES=#{HOMEBREW_LIBRARY_PATH}/cmake/trap_fetchcontent_provider.cmake
       -Wno-dev
       -DBUILD_TESTING=OFF
     ]