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# @(#)bsd.README 8.2 (Berkeley) 4/2/94
# $FreeBSD$
XXX This document is seriously out of date, it is currenly being revised.
This is the README file for the new make "include" files for the BSD
source tree. The files are installed in /usr/share/mk, and are, by
convention, named with the suffix ".mk".
bsd.dep.mk - handle Makefile dependencies
bsd.doc.mk - building troff system documents
bsd.info.mk - building GNU Info hypertext system
bsd.kern.mk - define warning flags for compiling the kernel
bsd.kmod.mk - building loadable kernel modules
bsd.lib.mk - support for building libraries
bsd.libnames.mk - define library names
bsd.man.mk - installing manual pages and their links
bsd.obj.mk - creating 'obj' directories and cleaning up
bsd.own.mk - define common variables
bsd.port.mk - building ports
bsd.port.subdir.mk - targets for building subdirectories for ports
bsd.prog.mk - building programs from source files
bsd.sgml.mk - building SGML documents
bsd.subdir.mk - targets for building subdirectories
Note, this file is not intended to replace reading through the .mk
files for anything tricky.
See also make(1), mkdep(1) and `PMake - A Tutorial',
located in /usr/share/doc/psd/12.make.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
RANDOM THINGS WORTH KNOWING:
The files are simply C-style #include files, and pretty much behave like
you'd expect. The syntax is slightly different in that a single '.' is
used instead of the hash mark, i.e. ".include <bsd.prog.mk>".
One difference that will save you lots of debugging time is that inclusion
of the file is normally done at the *end* of the Makefile. The reason for
this is because .mk files often modify variables and behavior based on the
values of variables set in the Makefile. To make this work, remember that
the FIRST target found is the target that is used, i.e. if the Makefile has:
a:
echo a
a:
echo a number two
the command "make a" will echo "a". To make things confusing, the SECOND
variable assignment is the overriding one, i.e. if the Makefile has:
a= foo
a= bar
b:
echo ${a}
the command "make b" will echo "bar". This is for compatibility with the
way the V7 make behaved.
It's fairly difficult to make the BSD .mk files work when you're building
multiple programs in a single directory. It's a lot easier split up the
programs than to deal with the problem. Most of the agony comes from making
the "obj" directory stuff work right, not because we switch to a new version
of make. So, don't get mad at us, figure out a better way to handle multiple
architectures so we can quit using the symbolic link stuff. (Imake doesn't
count.)
The file .depend in the source directory is expected to contain dependencies
for the source files. This file is read automatically by make after reading
the Makefile.
The variable DESTDIR works as before. It's not set anywhere but will change
the tree where the file gets installed.
The profiled libraries are no longer built in a different directory than
the regular libraries. A new suffix, ".po", is used to denote a profiled
object.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The include file <sys.mk> has the default rules for all makes, in the BSD
environment or otherwise. You probably don't want to touch this file.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The include file <bsd.man.mk> handles installing manual pages and their
links.
It has a single target:
maninstall:
Install the manual pages and their links.
It sets/uses the following variables:
MANDIR Base path for manual installation.
MANGRP Manual group.
MANOWN Manual owner.
MANMODE Manual mode.
MANSUBDIR Subdirectory under the manual page section, i.e. "/vax"
or "/tahoe" for machine specific manual pages.
MAN1 ... MAN9 The manual pages to be installed (use a .1 - .9 suffix).
MLINKS List of manual page links (using a .1 - .9 suffix). The
linked-to file must come first, the linked file second,
and there may be multiple pairs. The files are soft-linked.
The include file <bsd.man.mk> includes the include file <bsd.inc.mk>.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The include file <bsd.own.mk> contains the owners, groups, etc. for both
manual pages and binaries.
It has no targets.
It sets/uses the following variables:
BINGRP Binary group.
BINOWN Binary owner.
BINMODE Binary mode.
STRIP The flag passed to the install program to cause the binary
to be stripped. This is to be used when building your
own install script so that the entire system can be made
stripped/not-stripped using a single nob.
MANDIR Base path for manual installation.
MANGRP Manual group.
MANOWN Manual owner.
MANMODE Manual mode.
This file is generally useful when building your own Makefiles so that
they use the same default owners etc. as the rest of the tree.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The include file <bsd.prog.mk> handles building programs from one or
more source files, along with their manual pages. It has a limited number
of suffixes, consistent with the current needs of the BSD tree.
It has seven targets:
all:
build the program and its manual page
clean:
remove the program, any object files and the files a.out,
Errs, errs, mklog, and ${PROG}.core.
cleandir:
remove all of the files removed by the target clean, as
well as .depend, tags, and any manual pages.
depend:
make the dependencies for the source files, and store
them in the file .depend.
install:
install the program and its manual pages; if the Makefile
does not itself define the target install, the targets
beforeinstall and afterinstall may also be used to cause
actions immediately before and after the install target
is executed.
lint:
run lint on the source files
tags:
create a tags file for the source files.
It sets/uses the following variables:
BINGRP Binary group.
BINOWN Binary owner.
BINMODE Binary mode.
CLEANFILES Additional files to remove and
CLEANDIRS additional directories to remove during clean and cleandir
targets. "rm -f" and "rm -rf" used respectively.
COPTS Additional flags to the compiler when creating C objects.
HIDEGAME If HIDEGAME is defined, the binary is installed in
/usr/games/hide, and a symbolic link is created to
/usr/games/dm.
LDADD Additional loader objects. Usually used for libraries.
For example, to load with the compatibility and utility
libraries, use:
LDFILES=-lutil -lcompat
LDFLAGS Additional loader flags.
LINKS The list of binary links; should be full pathnames, the
linked-to file coming first, followed by the linked
file. The files are hard-linked. For example, to link
/bin/test and /bin/[, use:
LINKS= ${DESTDIR}/bin/test ${DESTDIR}/bin/[
MAN1...MAN9 Manual pages (should end in .1 - .9). If no MAN variable
is defined, "MAN1=${PROG}.1" is assumed.
PROG The name of the program to build. If not supplied, nothing
is built.
SRCS List of source files to build the program. If SRCS is not
defined, it's assumed to be ${PROG}.c.
DPADD Additional dependencies for the program. Usually used for
libraries. For example, to depend on the compatibility and
utility libraries use:
SRCLIB=${LIBCOMPAT} ${LIBUTIL}
There is a predefined identifier for each (non-profiled,
non-shared) library and object. Library file names are
transformed to identifiers by removing the extension and
converting to upper case.
There are no special identifiers for profiled or shared
libraries or objects. The identifiers for the standard
libraries are used in DPADD. This works correctly iff all
the libraries are built at the same time. Unfortunately,
it causes unnecessary relinks to shared libraries when
only the static libraries have changed. Dependencies on
shared libraries should be only on the library version
numbers.
STRIP The flag passed to the install program to cause the binary
to be stripped.
SUBDIR A list of subdirectories that should be built as well.
Each of the targets will execute the same target in the
subdirectories.
The include file <bsd.prog.mk> includes the include files <bsd.inc.mk>
and <bsd.man.mk>.
Some simple examples:
To build foo from foo.c with a manual page foo.1, use:
PROG= foo
.include <bsd.prog.mk>
To build foo from foo.c with a manual page foo.2, add the line:
MAN2= foo.2
If foo does not have a manual page at all, add the line:
NOMAN= noman
If foo has multiple source files, add the line:
SRCS= a.c b.c c.c d.c
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The include file <bsd.subdir.mk> contains the default targets for building
subdirectories. It has the same seven targets as <bsd.prog.mk>: all, clean,
cleandir, depend, install, lint, and tags. For all of the directories
listed in the variable SUBDIRS, the specified directory will be visited
and the target made. There is also a default target which allows the
command "make subdir" where subdir is any directory listed in the variable
SUBDIRS.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The include file <bsd.lib.mk> has support for building libraries. It has
the same seven targets as <bsd.prog.mk>: all, clean, cleandir, depend,
install, lint, and tags. It has a limited number of suffixes, consistent
with the current needs of the BSD tree.
It sets/uses the following variables:
LIBDIR Target directory for libraries.
LINTLIBDIR Target directory for lint libraries.
LIBGRP Library group.
LIBOWN Library owner.
LIBMODE Library mode.
LDADD Additional loader objects.
MAN1 ... MAN9 The manual pages to be installed (use a .1 - .9 suffix).
SRCS List of source files to build the library. Suffix types
.s, .c, and .f are supported. Note, .s files are preferred
to .c files of the same name. (This is not the default for
versions of make.)
The include file <bsd.lib.mk> includes the include files <bsd.inc.mk>
and <bsd.man.mk>.
It has rules for building profiled objects; profiled libraries are
built by default.
Libraries are ranlib'd before installation.
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