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10257 :: C backend not finding NimMain()

• Stuffe (orginal) [2023-06-07T20:06:53+02:00] view original

  I have been using GodotNim for more than a year now with no issues. A couple of days ago it stopped working with the following error:

  /Users/stefanlund/.cache/nim/backend_d/@mgodot@[email protected]:5046:6: error: call to undeclared function 'NimMain'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
              NimMain();
              ^
  1 error generated.
  Error: execution of an external compiler program 'clang -c  -w -ferror-limit=3 -pthread  -fPIC  -I/opt/homebrew/Cellar/nim/1.6.12/nim/lib -I/Users/projects/turing_complete/dyn_lib -o /Users/stefanlund/.cache/nim/backend_d/@mgodot@[email protected] /Users/stefanlund/.cache/nim/backend_d/@mgodot@[email protected]' failed with exit code: 1
  Run

  It only fails to find NimMain() on my m1 mac. I reformatted the mac to make sure I hadn't messed something up, but it still doesn't work so I think it must have something to do with the latest macos update. I tested and it still works on Windows.

  In the file godotnim.nim on line 890 i see this:

    {.emit: """
      NimMain();
    """.}
  Run

  If I comment that out, the project compiles again, but the library it produces instantly crashes. I am not familiar with nim internals so I am kind of at a dead end. Any ideas on how I can fix this?

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• PMunch (orginal) [2023-06-07T22:43:14+02:00] view original

  That is very strange. NimMain is essentially the procedure which starts the garbage collector and initializes global memory, so not only i it very important, but it should always be available. The emit way of calling it is a bit strange though, but it shouldn't fail..

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• Araq (orginal) [2023-06-07T23:45:38+02:00] view original

  Change the .emit to:

  {.emit: """
      void NimMain(void);
      NimMain();
    """.}
  
  Run

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• Stuffe (orginal) [2023-06-08T03:10:17+02:00] view original

  It worked, thank you!

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• sls1005 (orginal) [2023-06-08T07:01:45+02:00] view original

  From the error message:

  ISO C99 and later do not support implicit function declarations

  It's only available when its phototype is decleared.

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• PMunch (orginal) [2023-06-08T13:39:58+02:00] view original

  Wouldn't it be better to change it to add this outside the procedure:

  proc NimMain() {.importc, cdecl.}
  Run

  and then this instead of the emit:

  NimMain() # This is now just a normal Nim call
  Run

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• Araq (orginal) [2023-06-08T14:21:45+02:00] view original

  Yes, this should be fixed in GodotNim.

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