cmake: declutter root + remove obsolete variables

cmake/SDL3Config.cmake.in

@@ -0,0 +1,64 @@
+# SDL cmake project-config input for CMakeLists.txt script
+
+include(FeatureSummary)
+set_package_properties(SDL3 PROPERTIES
+  URL "https://www.libsdl.org/"
+  DESCRIPTION "low level access to audio, keyboard, mouse, joystick, and graphics hardware"
+)
+
+@PACKAGE_INIT@
+
+set(SDL3_FOUND TRUE)
+
+if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/SDL3Targets.cmake")
+  include("${CMAKE_CURRENT_LIST_DIR}/SDL3Targets.cmake")
+  set(SDL3_SDL3_FOUND TRUE)
+endif()
+if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/SDL3staticTargets.cmake")
+  if(ANDROID)
+    enable_language(CXX)
+  endif()
+  include("${CMAKE_CURRENT_LIST_DIR}/SDL3staticTargets.cmake")
+  set(SDL3_SDL3-static_FOUND TRUE)
+endif()
+if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/SDL3testTargets.cmake")
+  include("${CMAKE_CURRENT_LIST_DIR}/SDL3testTargets.cmake")
+  set(SDL3_SDL3_test_FOUND TRUE)
+endif()
+
+include("${CMAKE_CURRENT_LIST_DIR}/sdlfind.cmake")
+
+set(SDL_ALSA @SDL_ALSA@)
+set(SDL_ALSA_SHARED @SDL_ALSA_SHARED@)
+if(SDL_ALSA AND NOT SDL_ALSA_SHARED AND TARGET SDL3::SDL3-static)
+  sdlFindALSA()
+endif()
+unset(SDL_ALSA)
+unset(SDL_ALSA_SHARED)
+
+check_required_components(SDL3)
+
+# Create SDL3::SDL3 alias for static-only builds
+if(TARGET SDL3::SDL3-static AND NOT TARGET SDL3::SDL3)
+  if(CMAKE_VERSION VERSION_LESS "3.18")
+    # FIXME: Aliasing local targets is not supported on CMake < 3.18, so make it global.
+    add_library(SDL3::SDL3 INTERFACE IMPORTED)
+    set_target_properties(SDL3::SDL3 PROPERTIES INTERFACE_LINK_LIBRARIES "SDL3::SDL3-static")
+  else()
+    add_library(SDL3::SDL3 ALIAS SDL3::SDL3-static)
+  endif()
+endif()
+
+# For compatibility with autotools sdl3-config.cmake, provide SDL3_* variables.
+
+set(SDL3_PREFIX "@PACKAGE_CMAKE_INSTALL_PREFIX@")
+set(SDL3_EXEC_PREFIX "@PACKAGE_CMAKE_INSTALL_PREFIX@")
+set(SDL3_INCLUDE_DIR "@PACKAGE_CMAKE_INSTALL_FULL_INCLUDEDIR@")
+set(SDL3_INCLUDE_DIRS "${SDL3_INCLUDE_DIR}")
+set(SDL3_BINDIR "@PACKAGE_CMAKE_INSTALL_FULL_BINDIR@")
+set(SDL3_LIBDIR "@PACKAGE_CMAKE_INSTALL_FULL_LIBDIR@")
+set(SDL3_LIBRARIES SDL3::SDL3)
+set(SDL3_STATIC_LIBRARIES SDL3::SDL3-static)
+set(SDL3_STATIC_PRIVATE_LIBS)
+
+set(SDL3TEST_LIBRARY SDL3::SDL3_test)

cmake/cmake_uninstall.cmake.in

@@ -0,0 +1,17 @@
+if (NOT EXISTS "@CMAKE_BINARY_DIR@/install_manifest.txt")
+    message(FATAL_ERROR "Cannot find install manifest: \"@CMAKE_BINARY_DIR@/install_manifest.txt\"")
+endif()
+
+file(READ "@CMAKE_BINARY_DIR@/install_manifest.txt" files)
+string(REGEX REPLACE "\n" ";" files "${files}")
+foreach(file ${files})
+    message(STATUS "Uninstalling \"$ENV{DESTDIR}${file}\"")
+    execute_process(
+        COMMAND @CMAKE_COMMAND@ -E remove "$ENV{DESTDIR}${file}"
+        OUTPUT_VARIABLE rm_out
+        RESULT_VARIABLE rm_retval
+    )
+    if(NOT ${rm_retval} EQUAL 0)
+        message(FATAL_ERROR "Problem when removing \"$ENV{DESTDIR}${file}\"")
+    endif (NOT ${rm_retval} EQUAL 0)
+endforeach()

cmake/macros.cmake

@@ -68,19 +68,22 @@ macro(message_tested_option _NAME)
   message(STATUS "  ${_NAME}${_PAD}(Wanted: ${_REQVALUE}): ${HAVE_${_STRIPPEDNAME}}")
 endmacro()
 
-macro(listtostr _LIST _OUTPUT)
+function(listtostr LIST OUTPUT)
   if(${ARGC} EQUAL 3)
     # prefix for each element
-    set(_LPREFIX ${ARGV2})
+    set(LPREFIX ${ARGV2})
   else()
-    set(_LPREFIX "")
+    set(LPREFIX "")
   endif()
-  # Do not use string(REPLACE ";" " ") here to avoid messing up list
-  # entries
-  foreach(_ITEM ${${_LIST}})
-    set(${_OUTPUT} "${${_OUTPUT}} ${_LPREFIX}${_ITEM}")
+  # Do not use string(REPLACE ";" " ") here to avoid messing up list entries
+  set(res)
+  foreach(ITEM ${${LIST}})
+    if(ITEM)
+      set(res "${res} ${LPREFIX}${ITEM}")
+    endif()
   endforeach()
-endmacro()
+  set(${OUTPUT} "${res}" PARENT_SCOPE)
+endfunction()
 
 function(listtostrrev _LIST _OUTPUT)
   if(${ARGC} EQUAL 3)

cmake/sdl3.pc.in

@@ -0,0 +1,14 @@
+# sdl pkg-config source file
+
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: sdl3
+Description: Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.
+Version: @SDL_VERSION@
+Requires.private: @PKGCONFIG_DEPENDS@
+Conflicts:
+Libs: -L${libdir} @SDL_RLD_FLAGS@ @SDL_LIBS@ @PKGCONFIG_LIBS_PRIV@ @SDL_STATIC_LIBS@
+Cflags: -I${includedir} @SDL_CFLAGS@