- sys.mk:
add ${OBJC} and ${OBJCFLAGS} (equivalent to ${CC} and
${CFLAGS} respectively), and ${COMPILE.m} and ${LINK.m} rules
- bsd.sys.mk:
add .m, .m.o, and .m.ln rules (as per the C rules in sys.mk).
it's here, rather than in sys.mk, because `.m' isn't
exclusively used for Objective C files.
- bsd.lib.mk:
add .m.o, .m.po, .m.so, and .m.ln rules (as per C)
counterparts, and are used to compile programs that are needed to
compile other programs (see src/bin/sh for an example use). These
facilitate cross-compiling.
Define an NM variable - the program to use for nm(1)