Warp wrote:
>   How about making it a portable command-line utility and releasing the
> source?

How about making it as a macro?

Something like:
#macro undefall(file_in, tmp_file)
/* some magic code reading file_in, searching for #declares,
outputting the corresponding #undefs in tmp_file while
handling multiple declaration cases, arrays..., then
#including tmp_file (thus everything gets undeclared)*/
#end

The only missing step would be the tmp_file deletion.

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