Fortran: check for undeclared variables by forcing implicit none everywhere
C/C++: check for unused parameters and return types
removed unused variables from test cases
ci: do missing return and unused arg check with Github Actions
Resolves segfaults on i686 kernel. Also execute all available simd
instructions, not just the best one.
Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Signed-off-by: Michael Hudson <michael.hudson@ubuntu.com>
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=894774