Vala is now a mature, stable and widely-distributed programming language, and there is no longer a need to force generated C files to be distributed in tarballs of Vala projects.
One problem this causes is with conditional compilation of code in Vala, as this changes generation of the C code rather than passing through #ifdefs to it. This means that --[enable|disable]-feature options can’t easily be implemented in autoconf using Vala’s #ifdefs, since the generated C code will only correspond to the enable/disable value chosen at distcheck time. It would therefore be nice if automake supported non-distribution of the generated C code, if a project chooses to do so.
