Linked the defines used by the DSL and astaroth.h. Now f.ex. LENTROPY has to be set only once in acc/mhd_solver/stencil_defines.h and it is propagated throughout the whole project. The name for stencil_defines.h is not final and may change if I come up with a better name. In any case, there is now a standard header associated with each DSL solver where the user can set defines, and declare arrays (VTXBUF_LNRHO) and device constants (uniforms).

acc/preprocess.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 # Preprocesses the give file using GCC. This script is usually automatically called in
 # ./compile.sh, but may be called also individually for debugging purposes.
-gcc -E -x c ${@} | sed "s/#.*//g"
+cat ${@} | gcc -x c -E - | sed "s/#.*//g"