I am pretty sure this isn't possible. The headers get overridden by the most local settings. There isn't a way to concatenate them. In some cases there isn't a way to figure out what you want, e.g. if a heading property said ":tangle no" and your header said ":tangle yes" it would not make sense to concatenate these to ":tangle no yes".
I think you have to add -Wall to the src header. John ----------------------------------- Professor John Kitchin Doherty Hall A207F Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 412-268-7803 @johnkitchin http://kitchingroup.cheme.cmu.edu On Tue, Mar 6, 2018 at 1:25 AM, Michael Welle <mwe012...@gmx.net> wrote: > Hello, > > how can I concatenate header args? Let's assume I have an Org structure > like follows: > > * foo > :PROPERTIES: > :header-args: :flags -Wall > :END: > ** bar > #+begin_src C :flags -lm > #+end_src > > Now I want the code to be compiled with -Wall _and_ -lm. > > Regards > hmw > >
