directories and use .PATH to lookup the source files.
(Formerly, the libs were built from the source dirs, with MAKEOBJDIR
set to the compilation directory.)
This solves 2 problems:
-"mkdep" and "make" are now consistent about the file lookup, this fixes
bad interactions with amd reported in PR bin/7374 (Arne Juul) and
lossage reported by Andrew Gillham ("obj" dirs and relative paths still
don't work well together)
-kernel compile trees can be moved around without forcing a new
"make depend" - fixing PR kern/4021 by Martin Husemann
to :, so they can be used e.g. with <bsd.prog.mk>. Standardize variable
names used to configure kernel libraries.
Variables used by these Makefile.inc's are:
S must be set to the top of the 'sys' tree.
${LIB}DST may be set to the location of the directory where library
objects are to be built. Defaults to ${.OBJDIR}/lib/${lib}.
${LIB}_AS may be set to 'obj' to build a object from the library's
object files. (Otherwise, a library will be built.)
Defaults to 'library'.
${LIB}MISCMAKEFLAGS
Miscellaneous flags to be passed to the library's Makefile when
building. See library's Makefile for more details about
supported flags and their default values.
(where LIB is KERN, SA, or Z, and lib is kern, sa, or z, depending on which
library's Makefile.inc is being discussed.)
boot blocks to load compressed images. Sources and headers are copied
from src/lib (src/lib/libz, in particular) by making the 'update-sources'
target in this directory. This library builds in a manner similar to
libkern; much of the Makefile hackery was taken from there.
