docs: document _d_customflag.v files (used by V only when `-d customflag` is passed)

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Delyan Angelov 2021-01-30 17:44:32 +02:00
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@ -3312,6 +3312,8 @@ If a file has an environment-specific suffix, it will only be compiled for that
- `.c.v` => will be used only by the C backend. These files can contain C. code.
- `.x64.v` => will be used only by V's x64 backend.
- `_nix.c.v` => will be used only on Unix systems (non Windows).
- `_d_customflag.v` => will be used only if you pass `-d customflag` to V.
That corresponds to `$if customflag ? {}`, but for a whole file, not just a single block.
- `_${os}.c.v` => will be used only on the specific `os` system.
For example, `_windows.c.v` will be used only when compiling on Windows, or with `-os windows`.
- `_default.c.v` => will be used only if there is NOT a more specific platform file.