how to add all files found in :vimgrep to arglist?

I use Vim7.3.107, now when I use :vim command:
:vim /foo/ **.c

it no longer load all file into buffer list. it makes :vim command
faster, but now I can not use a single bufdo command to process all
these file. how to add these result file into some space to make I can
use a single xxxdo (maybe bufdo or argdo) to process all these file?

thx all guys here :-)

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