There's no problem with any shell which has the `-c` command line option (I've checked all the major shells, including fish, and all of them have it). The only thing we do is
``` <some shell> -c <some command> ```
There's nothing we need to test. I just don't know what you are talking about. Please have a look at the code.
We have the launch script
https://github.com/geany/geany/blob/master/src/build.c#L1162
for which I made the shell configurable, but we could just use /bin/sh for this one all the time.