Build pdf from auxiliary files only

After compiling with the option draftmode set, how can I create a PDF without recompiling everything.

I was looking all around, but somehow the main concern seems to be to get rid of the auxiliary files, instead of reusing them.

• "compiling" in this context means making a pdf file from TeX sources, so it isn't clear what part of that you want to skip? The aux files have some information about cross references but none of the actual text so you can't make a pdf from "the auxiliary files only" ? – David Carlisle Jan 13 '15 at 15:38
• With compiling I ment running pdflatex -draftmode my.tex. I was under the impression, that the auxiliary files are used to store the typesetting, which I wanted to reuse somehow. But I guess the question is answered, if it's impossible. – tynn Jan 13 '15 at 15:56
• You can look at the aux file in any text editor, typically they are only a few lines long, mainly it just has the numbers so that ... see section ?? on the first run can become see section 4 on teh second. – David Carlisle Jan 13 '15 at 16:10

The aux files do not contain any information about typesetting. They are generated TeX source files, and their main use is to record numbers used on later runs, such as cross references from \label or the widths of longtable columns etc.