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Differences between C, C++ and Nim​

C/C++ are built exactly the same, and Nim compiles into C.
The only difference between them is the files you send into the src variable.

# If you want to build a Nim app:
let code = @[ srcDir/"myfile.nim" ]

# If you want to build a C app with only one file:
let code = @[ srcDir/"myfile.c" ]

# If you want to build a C++ app with only one file:
let code = @[ srcDir/"myfile.cpp" ]

Nim​

Nim has module dependency resolution.
The only uniqueness for building Nim is that you can only send one .nim file for each object you build.

C and C++​

In C and C++ you will need to send all of your source files, because the compiler doesn't understand dependency resolution.
The SomeFolder.glob(".ext") function is created so that you don't need to explicitly list all files in your project manually,
and -also- maintain the list manually (which is a PITA, time consuming, and extremely error and bug prone).

That said, you can also explicitely list the files manually if you so desire.
This works for the same for both C and C++ files:

let code = @[
  "./mycode/file1.c",
  "./myother/file2.c",
  "./otherfolder/file4.c",
  # ... list 100 other files one by one in here ...
  ]

I would never recommend this, but... your project, your rules.