Charles Jacobsen authored Mar 22, 2016 and Vikram Narayanan committed Oct 26, 2016

We developed an example to test a clang/llvm/smack build before;
that example is now incorporated with the rest of the examples.

To experiment with weak symbols, I moved a few of the redefines
into libdeker (lcd_enter, lcd_exit, lcd_printk). These override
the liblcd versions. I also left the lcd_sync_call and
lcd_sync_reply redefines in environment.c.

There were a couple more clang fixes - one in the trampoline
assembly. The gnu assembler accepts "movq mem, mem" as a pseudo
instruction, but clang does not.

Fixed the "make clean" target. Made some extra scripts so it's easier
to build larger components (e.g. the entire microkernel, or all of
libdeker - including the special liblcd build).

The "main" required for Smack is in a "runtime" object file (sort of
like the C runtime). This is in libdeker/deker_rt.c.

Finally, I tweaked the LCD test module configuration so that you can
build a subset of the test modules (and choose how to build them).
This means you don't have to build everything (e.g., before, if a
module wanted to be built as non-isolated, you'd have to have the
microkernel built; but to get a successful microkernel build, you'd
probably need a full kernel build).