The problem is that there is no CMakeLists.txt here. This is my CMakeLists.txt, adapted from the example given in README_cmake.md in the github docs:
cmake_minimum_required(VERSION 3.10)
project(mygame)
add_subdirectory(vendor/sdl EXCLUDE_FROM_ALL)
add_executable(main src/main.cpp src/eventHandlers.cpp src/drawHelpers.cpp src/geometryHelpers.cpp src/loggingHelpers.cpp src/setupHelpers.cpp)
# SDL2::SDL2main may or may not be available. It is e.g. required by Windows GUI applications
if(TARGET SDL2::SDL2main)
# It has an implicit dependency on SDL2 functions, so it MUST be added before SDL2::SDL2 (or SDL2::SDL2-static)
target_link_libraries(main PRIVATE SDL2::SDL2main)
endif()
target_link_libraries(main PRIVATE SDL2::SDL2)
# Use include files from the "include" directory when compiling target "main"
target_include_directories(main PUBLIC include)
I of course get an error when I try to add the vendor/sdl subdirectory because of the missing CMakeLists.txt file
My question is basically what is wrong with this cmake file? If there’s nothing wrong then how can I get the cmakelists.txt into vendor/sdl?
add_subdirectory expects a directory with CMakeLists.txt (usually a source directory). To use prebuild artifact you linked you have to use find_package and set SDL2_DIR variable.
# Requires CMake version greater than or equal to the following
cmake_minimum_required(VERSION 3.20)
# We indicate the name of the project and the language used
project(example)
# We write the name of the application. The file app.exe will be created
add_executable(app)
# Specify where the application source files are stored
target_sources(app
PRIVATE
src/main.c
)
# We search for the library at the specified path in -Dlib_DIR
find_package(SDL3)
target_link_libraries(app PRIVATE SDL3::SDL3)
target_link_options(app PRIVATE -static)
# Run cmake from build/ with: cmake .. -G "MinGW Makefiles" -DCMAKE_TOOLCHAIN_FILE="cmake-toolchain-mingw64-x86_64.cmake" -DSDL2_DIR="C:\mingw_dev_lib\SDL2-2.30.10\i686-w64-mingw32\lib\cmake\SDL2"
cmake_minimum_required(VERSION 3.10)
project(main)
# This creates the file main.exe using the project sources
file(GLOB_RECURSE SRC src/*.cpp)
add_executable(main ${SRC})
# Use include files from the "include" directory when compiling target
target_include_directories(main PUBLIC include)
# Look for a file called sdl2-config.cmake, might be config by default
find_package(SDL2 REQUIRED)
# this if statement below is from the docs:
# SDL2::SDL2main may or may not be available. It is e.g. required by Windows GUI applications
if(TARGET SDL2::SDL2main)
# It has an implicit dependency on SDL2 functions, so it MUST be added before SDL2::SDL2 (or SDL2::SDL2-static)
target_link_libraries(main PRIVATE SDL2::SDL2main)
target_link_options(main)
endif()
target_link_libraries(main PRIVATE SDL2::SDL2)
but I get an error:
-- The C compiler identification is GNU 13.2.0
-- The CXX compiler identification is GNU 13.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/msys64/ucrt64/bin/x86_64-w64-mingw32-gcc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/msys64/ucrt64/bin/x86_64-w64-mingw32-g++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at C:/mingw_dev_lib/SDL2-2.30.10/i686-w64-mingw32/lib/cmake/SDL2/sdl2-config.cmake:13 (message):
File or directory
/tmp/tardir/SDL2-2.30.10/build-mingw/install-i686-w64-mingw32/bin
referenced by variable SDL2_BINDIR does not exist !
Call Stack (most recent call first):
C:/mingw_dev_lib/SDL2-2.30.10/i686-w64-mingw32/lib/cmake/SDL2/sdl2-config.cmake:27 (set_and_check)
CMakeLists.txt:14 (find_package)
It looks like the sdl2-config.cmake thinks that I have unzipped sdl2 into /tmp/tardir which is a linux dir, even though I specified SDL2_DIR.
this is the part of sdl2-config.cmake which I think is causing the problem:
