fix warnings with GCC 9.2 and -Wextra and some cleanup
Compiling OPAL with GCC 9.2 still gives some warnings if -Wextra is enabled.
Enable -Werror for all compiler (which was once the default anyway).
Edited by gsell
Code indexing in gitaly is broken and leads to code not being visible to the user. We work on the issue with highest priority.
Compiling OPAL with GCC 9.2 still gives some warnings if -Wextra is enabled.
Enable -Werror for all compiler (which was once the default anyway).