perl -MConfig -e 'print $Config{cc}'
perl -MConfig -e 'print $Config{ccflags}'
perl -MExtUtils::Embed -e ccopts -e ldopts

##</code><code>##

(gdb) print *ret
value has been optimized out

##</code><code>##

./configure CFLAGS='-g' && make clean && make CFLAGS='-g'