Instructions for Hello World cmake build do not work

SDK Get Help
1

The instructions for using cmake to build a project do not seem to work with the Hello World example:

$ cd /tmp
$ cp -r $PLAYDATE_SDK_PATH/C_API/Examples/Hello\ World .
$ cd Hello\ World
$ mkdir build
$ cd build
$ cmake ..

Produces the error

-- The C compiler identification is GNU 11.3.0
-- The ASM compiler identification is GNU
-- Found assembler: /usr/bin/cc
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- SDK Path: /store/sheldon/opt/PlaydateSDK
-- Configuring done
CMake Error at CMakeLists.txt:36 (add_library):
  Cannot find source file:

    src/main.c

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm .h
  .hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90 .f95 .f03 .hip .ispc


CMake Error at CMakeLists.txt:36 (add_library):
  No SOURCES given to target: hello_world


CMake Generate step failed.  Build files cannot be regenerated correctly.
2

Works here on Fedora/Ubuntu. What OS are you on? What version of CMake are you using? It failed on this line:

add_library(${PLAYDATE_GAME_NAME} SHARED src/main.c )

Also, might be worth verifying that file exists inside the Hello World example folder.

3

Mint, which is essentially Ubuntu.

sheldon@blackbird:~$ cmake --version
cmake version 3.22.1

CMake suite maintained and supported by Kitware (kitware.com/cmake).

.... huh, src/main.c doesn't exist. Interesting!

I reinstalled the SDK and the file now exists and the build works fine. I have no idea where the file went but it's probably safe to assume is was my error.

Thanks for the assistance.

4

Glad you got it sorted out! Sometimes the simplest solution is the right one. :slight_smile:

5

You'd think decades of development experience would have help catch that one, but nope! :slight_smile: