@karatin
You may read the manual (or fix it if it is wrong):
Exportc pragma
The exportc pragma provides a means to export a type, a variable, or a
procedure to C. Enums and constants can't be exported. The optional argument is
a string containing the C identifier. If the argument is missing, the C name is
the Nim identifier exactly as spelled:
```nim
proc callme(formatstr: cstring) {.exportc: "callMe", varargs.}
```
Note that this pragma is somewhat of a misnomer: Other backends will provide
the same feature under the same name.
