From a9bcc81f821d7c66f623779fa5147e728eb3c388 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 4 May 2024 03:24:41 +0200
Subject: Adding upstream version 3.3.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 cmake/PreventInSourceBuilds.cmake | 55 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 cmake/PreventInSourceBuilds.cmake

(limited to 'cmake/PreventInSourceBuilds.cmake')

diff --git a/cmake/PreventInSourceBuilds.cmake b/cmake/PreventInSourceBuilds.cmake
new file mode 100644
index 0000000..6488ced
--- /dev/null
+++ b/cmake/PreventInSourceBuilds.cmake
@@ -0,0 +1,55 @@
+# PreventInSourceBuilds
+# ---------------------
+#
+# Prevent in-source builds
+#
+# It is generally acknowledged that it is preferable to run CMake out of source,
+# in a dedicated build directory.  To prevent users from accidentally running
+# CMake in the source directory, just include this module.
+
+option(ALLOW_IN_SOURCE_BUILD "[deprecated] Allow building in source tree" OFF)
+
+if (ALLOW_IN_SOURCE_BUILD)
+	set(CMAKE_DISABLE_SOURCE_CHANGES OFF CACHE INTERNAL "policy")
+	set(CMAKE_DISABLE_IN_SOURCE_BUILD OFF CACHE INTERNAL "policy")
+	if("${srcdir}" STREQUAL "${bindir}")
+		message(WARNING "Running in-source-tree build [ALLOW_IN_SOURCE_BUILD=ON]")
+	endif()
+else()
+	set(CMAKE_DISABLE_SOURCE_CHANGES ON CACHE INTERNAL "policy")
+	set(CMAKE_DISABLE_IN_SOURCE_BUILD ON CACHE INTERNAL "policy")
+
+	# make sure the user doesn't play dirty with symlinks
+	get_filename_component(srcdir "${CMAKE_SOURCE_DIR}" REALPATH)
+	get_filename_component(bindir "${CMAKE_BINARY_DIR}" REALPATH)
+
+	# disallow in-source builds
+	if("${srcdir}" STREQUAL "${bindir}")
+			 message(FATAL_ERROR "\
+
+CMake must not to be run in the source directory. \
+Rather create a dedicated build directory and run CMake there. \
+CMake now already created some files, to clean up after this aborted in-source compilation:
+   rm -r CMakeCache.txt CMakeFiles
+or
+   git clean -xdf
+
+If you happen to require in-source-tree builds for some reason rerun with -DALLOW_IN_SOURCE_BUILD=ON
+")
+	endif()
+
+# Check for remnants of in source builds
+	if(EXISTS "${CMAKE_SOURCE_DIR}/CMakeCache.txt" OR EXISTS "${CMAKE_SOURCE_DIR}/CMakeFiles")
+		message(FATAL_ERROR " \
+
+Remnants of in source CMake run detected, aborting!
+
+To clean up after this aborted in-source compilation:
+   rm -r CMakeCache.txt CMakeFiles
+or
+   git clean -xdf
+
+If you happen to require in-source-tree builds for some reason rerun with -DALLOW_IN_SOURCE_BUILD=ON
+")
+	endif()
+endif()
-- 
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