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10371 :: Problems compiling objc code including <UIKit/UIKit.h> on osx

• krakengore (orginal) [2023-08-03T13:30:25+02:00] view original

  Hello, i'm trying to compile this simple program:

  {.passL: "-framework UIKit".}
  
  type
      MTLDevice* {.importc, header: "<UIKit/UIKit.h>", incompleteStruct.} = object
  
  proc MTLCreateSystemDefaultDevice(): MTLDevice {.importc, header: "<UIKit/UIKit.h>".}
  
  proc main() =
      let device = MTLCreateSystemDefaultDevice()
      discard device
  
  when isMainModule:
      main()
  Run

  But it produces:

  
  kunitoki$ nim objc -r test.nim
  Hint: used config file '/Users/kunitoki/.choosenim/toolchains/nim-2.0.0/config/nim.cfg' [Conf]
  Hint: used config file '/Users/kunitoki/.choosenim/toolchains/nim-2.0.0/config/config.nims' [Conf]
  ......................................................................
  CC: ../.choosenim/toolchains/nim-2.0.0/lib/system/exceptions.nim
  CC: ../.choosenim/toolchains/nim-2.0.0/lib/std/private/digitsutils.nim
  CC: ../.choosenim/toolchains/nim-2.0.0/lib/system/dollars.nim
  CC: ../.choosenim/toolchains/nim-2.0.0/lib/system.nim
  CC: test.nim
  /Users/kunitoki/.cache/nim/test_d/@mtest.nim.m:8:10: fatal error: 'UIKit/UIKit.h' file not found
  #include <UIKit/UIKit.h>
           ^~~~~~~~~~~~~~~
  1 error generated.
  Error: execution of an external compiler program 'clang -c  -pthread   -I/Users/kunitoki/.choosenim/toolchains/nim-2.0.0/lib -I/Users/kunitoki/nim_test -o /Users/kunitoki/.cache/nim/test_d/@mtest.nim.m.o /Users/kunitoki/.cache/nim/test_d/@mtest.nim.m' failed with exit code: 1
  Run

  Any idea what i should be looking for ? (i have xcode tools installed and ready if that is what you are thinking).

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• awr1 (orginal) [2023-08-03T16:00:20+02:00] view original

  the header is unnecessary if you have the binary definitions, which is that MTLDevice is a ptr object and that MTLCreateSystemDefaultDevice() is of calling convention cdecl

  you need to also link in -framework Metal and -lobjc. if you want to use the header you need to pass the framework to the compiler and not just the linker

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• elcritch (orginal) [2023-08-04T03:58:26+02:00] view original

  You may also find looking at how Windy does it:

  • https://github.com/treeform/windy/blob/master/src/windy/platforms/macos/platform.nim
  • https://github.com/treeform/windy/blob/f7cedbaccb5d73922350f409b1ce3fee6a310a76/src/windy/platforms/macos/objc.nim#L13

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• krakengore (orginal) [2023-08-11T09:55:52+02:00] view original

  Thanks all for the suggestions, i've been able to progress !

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