Cmake: add ability to select frontends

CMakeLists.txt

@@ -2,6 +2,19 @@ cmake_minimum_required(VERSION 3.13)
 
 project(applewin HOMEPAGE_URL "https://github.com/audetto/AppleWin")
 
+option(BUILD_APPLEN   "build ncurses frontend")
+option(BUILD_QAPPLE   "build Qt5 frontend")
+option(BUILD_SA2      "build SDL2 frontend")
+option(BUILD_LIBRETRO "build libretro core")
+
+if (NOT (BUILD_APPLEN OR BUILD_QAPPLE OR BUILD_SA2 OR BUILD_LIBRETRO))
+  message(NOTICE "Building everything by default")
+  set(BUILD_APPLEN ON)
+  set(BUILD_QAPPLE ON)
+  set(BUILD_SA2 ON)
+  set(BUILD_LIBRETRO ON)
+endif()
+
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
@@ -29,7 +42,7 @@ execute_process(COMMAND uname -n
 if(${UNAME} STREQUAL raspberrypi)
   # it is too slow and might cause out of memory issues
   # more forensic is required
-  MESSAGE("Raspberry Pi detected: IPO disabled")
+  MESSAGE(NOTICE "Raspberry Pi detected: IPO disabled")
 else()
   include(CheckIPOSupported)
   check_ipo_supported()
@@ -39,13 +52,28 @@ endif()
 include_directories(source)
 
 add_subdirectory(source)
-add_subdirectory(source/frontends/common2)
-add_subdirectory(source/frontends/ncurses)
-add_subdirectory(source/frontends/qt)
-add_subdirectory(source/frontends/sdl)
-add_subdirectory(source/frontends/libretro)
 add_subdirectory(test/TestCPU6502)
 
+if (BUILD_LIBRETRO OR BUILD_APPLEN OR BUILD_SA2)
+  add_subdirectory(source/frontends/common2)
+endif()
+
+if (BUILD_APPLEN)
+  add_subdirectory(source/frontends/ncurses)
+endif()
+
+if (BUILD_QAPPLE)
+  add_subdirectory(source/frontends/qt)
+endif()
+
+if (BUILD_SA2)
+  add_subdirectory(source/frontends/sdl)
+endif()
+
+if (BUILD_LIBRETRO)
+  add_subdirectory(source/frontends/libretro)
+endif()
+
 set(CPACK_PACKAGE_VERSION "1.30.6.0")
 set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Apple ][ emulator for Linux")
 set(CPACK_PACKAGE_CONTACT "audetto <mariofutire@gmail.com>")

linux.md

@@ -97,9 +97,6 @@ Video works, but the vertical flip is done in software.
 
 Audio (speaker) works.
 
-Must be manually configured:
-``cmake -DLIBRETRO_COMMON_PATH=/path/to/libretro-common``
-
 Easiest way to run from the ``build`` folder:
 ``retroarch -L source/frontends/libretro/applewin_libretro.so ../bin/MASTER.DSK``
 
@@ -120,6 +117,18 @@ cmake -DCMAKE_BUILD_TYPE=RELEASE ..
 make
 ```
 
+### Frontend selection
+
+There are 4 `cmake` variables to selectively enable frontends: `BUILD_APPLEN`, `BUILD_QAPPLE`, `BUILD_SA2` and `BUILD_LIBRETRO`.
+
+Usage:
+
+```
+cmake -DBUILD_SA2=ON -DBUILD_LIBRETRO=ON ..
+```
+
+or use `cmake-gui` (if none is selected, they are all built).
+
 ### Fedora
 
 On Fedora 35, from a fresh installation, install all packages from [fedora.list.txt](source/linux/fedora.list.txt).

source/frontends/libretro/CMakeLists.txt

@@ -1,52 +1,42 @@
-# there is no simple package for libretro-common
-# this requires user input
-set(LIBRETRO_COMMON_PATH NONE CACHE PATH "path to libretro-common")
-
-if (EXISTS ${LIBRETRO_COMMON_PATH}/include/libretro.h)
-  message("Using LIBRETRO_COMMON_PATH=${LIBRETRO_COMMON_PATH}")
-
-  set(SOURCE_FILES
-    environment.cpp
-    libretro.cpp
-    rdirectsound.cpp
-    game.cpp
-    joypadbase.cpp
-    joypad.cpp
-    analog.cpp
-    rdirectsound.cpp
-    retroregistry.cpp
-    retroframe.cpp
-    )
-
-  set(HEADER_FILES
-    environment.h
-    rdirectsound.h
-    game.h
-    joypadbase.h
-    joypad.h
-    analog.h
-    rdirectsound.h
-    retroregistry.h
-    retroframe.h
-    )
-
-  add_library(applewin_libretro SHARED
-    ${SOURCE_FILES}
-    ${HEADER_FILES}
-    )
-
-  target_include_directories(applewin_libretro PRIVATE
-    ${LIBRETRO_COMMON_PATH}/include
-    )
-
-  target_link_libraries(applewin_libretro PRIVATE
-    appleii
-    common2
-    )
-
-  # just call it "applewin_libretro.so" as per libretro standard
-  set_target_properties(applewin_libretro PROPERTIES PREFIX "")
-
-else()
-  message(WARNING "Bad LIBRETRO_COMMON_PATH=${LIBRETRO_COMMON_PATH}, skipping 'libretro' core")
-endif()
+set(SOURCE_FILES
+  environment.cpp
+  libretro.cpp
+  rdirectsound.cpp
+  game.cpp
+  joypadbase.cpp
+  joypad.cpp
+  analog.cpp
+  rdirectsound.cpp
+  retroregistry.cpp
+  retroframe.cpp
+  )
+
+set(HEADER_FILES
+  environment.h
+  rdirectsound.h
+  game.h
+  joypadbase.h
+  joypad.h
+  analog.h
+  rdirectsound.h
+  retroregistry.h
+  retroframe.h
+  libretro-common/include/libretro.h
+  )
+
+add_library(applewin_libretro SHARED
+  ${SOURCE_FILES}
+  ${HEADER_FILES}
+  )
+
+target_include_directories(applewin_libretro PRIVATE
+  libretro-common/include
+  )
+
+target_link_libraries(applewin_libretro PRIVATE
+  appleii
+  common2
+  )
+
+# just call it "applewin_libretro.so" as per libretro standard
+set_target_properties(applewin_libretro PROPERTIES PREFIX "")