Merge pull request #43 from spicyjpeg/cmake

Even more CMake fixes, submodules, pads example

1 files changed, 20 insertions, 4 deletions

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 7cd7e98..15212c8 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -1,7 +1,7 @@
 # PSn00bSDK examples build script
 # (C) 2021 spicyjpeg - MPL licensed
 
-cmake_minimum_required(VERSION 3.21)
+cmake_minimum_required(VERSION 3.20)
 
 project(
 	PSn00bSDK-examples
@@ -10,16 +10,32 @@ project(
 	HOMEPAGE_URL "http://lameguy64.net/?page=psn00bsdk"
 )
 
+include(GNUInstallDirs)
+
+# Find all subdirectories that contain a CMake build script. This includes the
+# top-level examples directory and this file as well, however we're going to
+# skip it.
 file(
 	GLOB_RECURSE _examples
+	RELATIVE     ${PROJECT_SOURCE_DIR}
 	${PROJECT_SOURCE_DIR}/CMakeLists.txt
 )
 
 foreach(_script IN LISTS _examples)
-	cmake_path(GET _script PARENT_PATH _dir)
-	if(_dir STREQUAL PROJECT_SOURCE_DIR)
+	if(_script STREQUAL "CMakeLists.txt")
 		continue()
 	endif()
 
-	add_subdirectory(${_dir})
+	# CMake provides no way to override the install prefix of a subdirectory,
+	# as it "imports" its targets into the main project rather than treating it
+	# as a separate project. However, as the example subdirectories use
+	# install(... TYPE BIN) to install executables, it is possible to override
+	# CMAKE_INSTALL_BINDIR temporarily to place them in any directory within
+	# the install prefix. This is a hack, but it allows us to preserve the
+	# examples' folder hierarchy in the installation directory (it is already
+	# preserved by CMake in the build tree!) with minimal effort.
+	cmake_path(GET _script PARENT_PATH _dir)
+	cmake_path(GET _dir PARENT_PATH CMAKE_INSTALL_BINDIR)
+
+	add_subdirectory(${PROJECT_SOURCE_DIR}/${_dir})
 endforeach()