If C functions you want to import are declared with specific calling
convention, you would need to import them with same calling convention.
<https://osdev.wiki/pages/calling_conventions.html>
If you import C functions using header pragma, you would not need to specify
calling convention.
C macro is not a C functions, just looks like a function when you call it. You
don't need to specify calling convention.
For example:
{.emit: """
#define CMACRO(a,b) ((a) > (b) ? (a): (b))
""".}
proc cmacro(a, b: int): int {.importc: "CMACRO", nodecl.}
proc cmacro(a, b: float): float {.importc: "CMACRO", nodecl.}
echo cmacro(10, 100)
echo cmacro(-1.0, 0)
Run
If C macros are defined in header file, you need to use `header` pragma instead
of `nodecl`.
