Threads are needed by many SDL subsystems and may not be disabled when compiling for 3DS

[CrossScarDev]

I'm making a game with SDL3 and I had successfully compiled it for the 3DS but the second time I tried to compile it I get this error.

I'm building my project with this command:

cmake -S. -Bbuild-3ds -DCMAKE_TOOLCHAIN_FILE="$DEVKITPRO/cmake/3DS.cmake" -DCMAKE_BUILD_TYPE=Release

Here is my CMakeLists.txt:

cmake_minimum_required(VERSION 3.16)

include(FetchContent)

FetchContent_Declare(
  cmrc
  DOWNLOAD_EXTRACT_TIMESTAMP OFF
  URL https://github.com/vector-of-bool/cmrc/archive/refs/tags/2.0.1.tar.gz
  FIND_PACKAGE_ARGS
)
FetchContent_MakeAvailable(cmrc)
include(${cmrc_SOURCE_DIR}/CMakeRC.cmake)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

project(souls-of-tartarus)

FetchContent_Declare(
  LDtkLoader
  DOWNLOAD_EXTRACT_TIMESTAMP OFF
  URL https://github.com/Madour/LDtkLoader/archive/refs/tags/1.5.3.1.tar.gz
  FIND_PACKAGE_ARGS
)
FetchContent_MakeAvailable(LDtkLoader)

FetchContent_Declare(
  SDL3
  DOWNLOAD_EXTRACT_TIMESTAMP OFF
  URL https://github.com/libsdl-org/SDL/archive/refs/tags/release-3.2.4.tar.gz
  FIND_PACKAGE_ARGS
)
FetchContent_MakeAvailable(SDL3)

FetchContent_Declare(
  SDL3_image
  DOWNLOAD_EXTRACT_TIMESTAMP OFF
  URL https://github.com/libsdl-org/SDL_image/archive/refs/tags/release-3.2.0.tar.gz
  FIND_PACKAGE_ARGS
)
FetchContent_MakeAvailable(SDL3_image)

cmrc_add_resource_library(resources ALIAS resources::rc resources/tilemap.png resources/level.ldtk resources/player.png)

add_executable(${PROJECT_NAME} src/main.cpp src/player.cpp src/camera.cpp)

target_link_libraries(${PROJECT_NAME} PRIVATE LDtkLoader::LDtkLoader SDL3_image::SDL3_image SDL3::SDL3 resources::rc)

if("${PLATFORM}" STREQUAL "Web")
  target_link_options(${PROJECT_NAME} PUBLIC -sNO_DISABLE_EXCEPTION_CATCHING PUBLIC --shell-file build-resources/shell.html)
  set(CMAKE_EXECUTABLE_SUFFIX ".html")
  set_target_properties(${PROJECT_NAME} PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/web OUTPUT_NAME "index")
endif()

file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/build-resources/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/build-resources)

[madebr]

Our CMake script unconditionally considers threads available on Nintendo 3DS.

SDL/CMakeLists.txt

Lines 2862 to 2896 in 3b4cfc1

	elseif(N3DS)
	sdl_glob_sources("${SDL3_SOURCE_DIR}/src/main/n3ds/*.c")
	if(SDL_AUDIO)
	set(SDL_AUDIO_DRIVER_N3DS 1)
	sdl_glob_sources("${SDL3_SOURCE_DIR}/src/audio/n3ds/*.c")
	set(HAVE_SDL_AUDIO TRUE)
	endif()
	set(SDL_FILESYSTEM_N3DS 1)
	sdl_glob_sources("${SDL3_SOURCE_DIR}/src/filesystem/n3ds/*.c")
	set(HAVE_SDL_FILESYSTEM TRUE)
	# !!! FIXME: do we need a FSops implementation for this?
	if(SDL_JOYSTICK)
	set(SDL_JOYSTICK_N3DS 1)
	sdl_glob_sources("${SDL3_SOURCE_DIR}/src/joystick/n3ds/*.c")
	set(HAVE_SDL_JOYSTICK TRUE)
	endif()
	if(SDL_POWER)
	set(SDL_POWER_N3DS 1)
	sdl_glob_sources("${SDL3_SOURCE_DIR}/src/power/n3ds/*.c")
	set(HAVE_SDL_POWER TRUE)
	endif()
	set(SDL_THREAD_N3DS 1)
	sdl_glob_sources("${SDL3_SOURCE_DIR}/src/thread/n3ds/*.c")
	sdl_sources(
	"${SDL3_SOURCE_DIR}/src/thread/generic/SDL_syscond.c"
	"${SDL3_SOURCE_DIR}/src/thread/generic/SDL_systls.c"
	"${SDL3_SOURCE_DIR}/src/thread/generic/SDL_sysrwlock.c"
	)
	set(HAVE_SDL_THREADS TRUE)

Please debug on your system why it does not enter this if(N3DS) branch, and does not do set(HAVE_SDL_THREADS TRUE).

[CrossScarDev]

This might be a bug with devkitpro because I can get it to compile if I use -DN3DS=1 but the file extension is wrong, so the compilers seem to be set correctly, but some things aren't.

[madebr]

All we do on ci is pass -DCMAKE_TOOLCHAIN_FILE=${DEVKITPRO}/cmake/3DS.cmake to cmake.

[CrossScarDev]

just tried that and it didn't work