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3396 :: C file location

• DTxplorer (orginal) [2017-12-04T23:30:13+01:00] view original

  Hi, I never had time to really test this great language, in consequence I'm a kind of eternal noob, so I apologize for the trivial problem.

  I try to bind a minimal C function for learning purpose.

  c_function.h

  int addTwo(int x)
    {
      return x + 2;
    }
  Run

  c_function.nim

  proc addTwo*(x:int):int {.header: "c_function.h", importc: "addTwo".}
  Run

  use_c_function.nim

  import c_function
  
  echo addTwo(1)
  Run

  Nim's debugger throws an error from GCC because the file "c_function.h" is not found. All the source files above are in the same location. What is the proper way please ?

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• darek (orginal) [2017-12-05T05:09:08+01:00] view original

  You should tell nim where to look. There is an option --cincludes (try nim --advanced).

  So in your case: nim c --cincludes:"." use_c_function.nim

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• Lando (orginal) [2017-12-05T10:02:30+01:00] view original

  Trying to compile use_c_function.nim results in

  
  Error: execution of an external compiler program 'gcc -c  -w  -I/home/ftep/.choosenim/toolchains/nim-0.17.2/lib -o /tmp/cftest/nimcache/use_c_function.o /tmp/cftest/nimcache/use_c_function.c' failed with exit code: 1
  Run

  which points to the problem: the include path defined by the -I compiler option does not contain c_function.h. This is fixed by

  
  nim c --passC='-I.' -r use_c_function.nim
  Run

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• DTxplorer (orginal) [2017-12-05T18:13:36+01:00] view original

  Thanks for the tip. I guess in a serious project the headers are linked using a build tool.

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