How do I check what options are compiled into a Linux kernel without looking at
/boot/config-* and if I don't have access to the
/boot/config-* file that's left over?
Unless your kernel was built with
CONFIG_IKCONFIG_PROC, which would make the config available in
/proc as sysadmin1138 mentioned above, you're pretty much out of luck. Debian and RH based kernel packages do, however, generally install a
config-$version file in
/boot. So unless it's a custom kernel, it should be available there.
I believe /proc/config.gz contains the .config file the kernel was compiled with.