redirect messages to stdout (windows)

Is there a way to redirect vim messages to the Windows console?

My makefile runs vim to pre-process some files. It does so with
vim -c "source preproc.vim" -c wa -c qa input.c
My issue is that while vim runs I have to keep watching the Windows
console to spot if vim logs a error to its messages buffer. And if it does,
I can but acknowledge the message which then quickly disappears
because vim ends due to -q qa.

So I thought that if I could redirect vim's messages buffer to stdout
I could then run make and later inspect its stdout for errors - including for
vim's errors. Is this possible? I mean is it possible to redirect vim's error
messages to stdout?

If not, then how can I make vim stop and wait for my console input
when vim logs an error to its messages buffer?
I know that removing -c qa from the command line would do just that,
but it would also halt the make run when there are no errors, that's
not acceptable. I want for make to complete automatically if there are
no vim errors.

I guess overall I'm looking for your thoughts and best practices about
using vim as a preprocessor in a makefile.

Thanks in advance.

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