[Swatantra-66]

Summary

Addresses the CMake vs. Make build-system gap for apps/games/NXDoom identified in issue apache/nuttx#19549 ("[Analysis] CMake vs. Make Build-System Gap Analysis"):

Adds apps/games/NXDoom/CMakeLists.txt providing CMake build configuration for the NXDoom game port:

• Declares the nxdoom application target via nuttx_add_application with configurable priority (CONFIG_GAMES_NXDOOM_PRIORITY) and stack size (CONFIG_GAMES_NXDOOM_STACKSIZE).
• Includes common sources (i_system.c, m_argv.c, m_misc.c, z_native.c), dehacked sources, base sources, and doom core engine sources.
• Implements conditional compilation matching Makefile:
  • CONFIG_GAMES_NXDOOM_ENDOOM: includes src/i_endoom.c and textscreen widgets.
  • CONFIG_GAMES_NXDOOM_NET: includes networking logic and textscreen widgets.
  • CONFIG_GAMES_NXDOOM_SOUND: includes audio, MIDI, and sound effect sources.
  • CONFIG_GAMES_NXDOOM_RTTTL_MUSIC: includes RTTTL music playback support.
• Configures include paths for src, src/doom, textscreen, and pcsound.

Addresses apache/nuttx#19549

Together with #3861, this completes 100% CMake build support for all games in apps/games.

Impact

• New Feature: Enables CMake build configuration and compilation for NXDoom.
• Existing Feature: No change to existing Make build or runtime logic.
• Compatibility: Fully backwards compatible.

Testing

• Host: Linux x86_64 (Ubuntu / WSL2)
• Toolchain: GCC 15.2.0, CMake 4.2.3, Ninja 1.13.2
• Verification: Formatted with cmake-format and verified with checkpatch.sh.
• Target: sim:nsh (with CONFIG_GAMES_NXDOOM=y, CONFIG_ALLOW_GPL_COMPONENTS=y, CONFIG_DRIVERS_VIDEO=y, CONFIG_VIDEO_FB=y, CONFIG_CRYPTO=y, CONFIG_LIBC_LOCALE=y).

Build Log:

$ cmake -B build -DBOARD_CONFIG=sim:nsh -GNinja
-- Initializing NuttX
--   CMake:  4.2.3
--   Ninja:  1.13.2
--   Board:  sim
--   Config: nsh
--   Appdir: /path/to/nuttx-apps
-- Configuring done (100.4s)
-- Generating done (10.9s)
-- Build files have been written to: build

$ cmake --build build --target apps_nxdoom
[1/94] Building C object apps/games/NXDoom/CMakeFiles/apps_nxdoom.dir/src/z_native.c.o
[2/94] Building C object apps/games/NXDoom/CMakeFiles/apps_nxdoom.dir/src/i_main.c.o
[3/94] Building C object apps/games/NXDoom/CMakeFiles/apps_nxdoom.dir/src/m_argv.c.o
...
[92/94] Building C object apps/games/NXDoom/CMakeFiles/apps_nxdoom.dir/src/doom/st_stuff.c.o
[93/94] Building C object apps/games/NXDoom/CMakeFiles/apps_nxdoom.dir/src/doom/wi_stuff.c.o
[94/94] Linking C static library apps/games/NXDoom/libapps_nxdoom.a
[94/94] Built target apps_nxdoom

(Note: NXDoom runtime execution requires an external DOOM IWAD game data file (e.g. doom1.wad) in /data/ and an active framebuffer display driver; verified static library compilation and symbol linking).

[linguini1]

Maybe let's wait for #3860 to be merged, and then update this PR so Make and CMake are the same. Otherwise we will have a diversion.

[Swatantra-66]

Sounds good, @linguini1!

I will keep an eye on #3860. As soon as it merges into master, I will rebase and update CMakeLists.txt to match your new memory options (z_zone/z_native) and configuration flags so Make and CMake stay 1:1 in sync.