Since we're caching the include flags and linker flags, we should also
cache the exact helper binaries we're running. This avoids getting
errors because the environment changed.
Signed-off-by: Thiago Macieira <thiago@macieira.org>
You may have noticed that running make is a little slow. Every time
that it is loaded, it will try to detect everything again. So,
instead, save the output and reload it the next time.
This is implemented by adding a rule that (re-)creates the
config.cache file, which is included by make. If the file doesn't
exist yet, make will first run the rule which creates it, then reload
itself.
You can also cause it to reconfigure by running "make configure".
Signed-off-by: Thiago Macieira <thiago@macieira.org>
Configure.mk contains the detection rules, whereas Rules.mk contains
the rules to actually build Subsurface. This simplifies Makefile
greatly, which is the file that should be actually modified during
regular updates to the codebase.
Signed-off-by: Thiago Macieira <thiago@macieira.org>
