# @(#)bsd.README 8.2 (Berkeley) 4/2/94 # $FreeBSD$ This is the README file for the "include" files for the FreeBSD source tree. The files are installed in /usr/share/mk, and are by convention, named with the suffix ".mk". These files store several build options and should be handled with caution. Note, this file is not intended to replace reading through the .mk files for anything tricky. There are two main types of make include files. One type is the generally usable make include files, such as bsd.prog.mk and bsd.lib.mk. The other is the internal make include files, such as bsd.files.mk and bsd.man.mk, which can not/should not be used directly but are used by the other make include files. In most cases it is only interesting to include bsd.prog.mk or bsd.lib.mk. bsd.arch.inc.mk - includes arch-specific Makefile.$arch bsd.compiler.mk - defined based on current compiler bsd.confs.mk - install of configuration files bsd.cpu.mk - sets CPU/arch-related variables (included from sys.mk) bsd.crunchgen.mk - building crunched binaries using crunchgen(1) bsd.dep.mk - handle Makefile dependencies bsd.doc.mk - building troff system documents bsd.endian.mk - TARGET_ENDIAN=1234(little) or 4321 (big) for target bsd.files.mk - install of general purpose files bsd.incs.mk - install of include files bsd.info.mk - building GNU Info hypertext system (deprecated) bsd.init.mk - initialization for the make include files bsd.kmod.mk - building loadable kernel modules bsd.lib.mk - support for building libraries bsd.libnames.mk - define library names bsd.links.mk - install of links (sym/hard) bsd.man.mk - install of manual pages and their links bsd.nls.mk - build and install of NLS catalogs bsd.obj.mk - creating 'obj' directories and cleaning up bsd.own.mk - define common variables bsd.port.mk - building ports bsd.port.post.mk - building ports bsd.port.pre.mk - building ports bsd.port.subdir.mk - targets for building subdirectories for ports bsd.prog.mk - building programs from source files bsd.progs.mk - build multiple programs from sources bsd.snmpmod.mk - building modules for the SNMP daemon bsnmpd bsd.subdir.mk - targets for building subdirectories bsd.sys.mk - common settings used for building FreeBSD sources bsd.test.mk - building test programs from source files sys.mk - default rules for all makes This file does not document bsd.port*.mk. They are documented in ports(7). See also make(1), mkdep(1), style.Makefile(5) and `PMake - A Tutorial', located in /usr/share/doc/psd/12.make. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Random things worth knowing about this document: If appropriate when documenting the variables the default value is indicated using square brackets e.g. [gzip]. In some cases the default value depend on other values (e.g. system architecture). In these cases the most common value is indicated. This document contains some simple examples of the usage of the BSD make include files. For more examples look at the makefiles in the FreeBSD source tree. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= RANDOM THINGS WORTH KNOWING: The files are like 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 ". 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 ${a} the command "make b" will echo "bar". This is for compatibility with the way the V7 make behaved. It's fairly difficult to make the BSD .mk files work when you're building multiple programs in a single directory. It's a lot easier to split up the programs than to deal with the problem. Most of the agony comes from making the "obj" directory stuff work right, not because we switch to a new version of make. So, don't get mad at us, figure out a better way to handle multiple architectures so we can quit using the symbolic link stuff. (Imake doesn't count.) The file .depend in the source directory is expected to contain dependencies for the source files. This file is read automatically by make after reading the Makefile. The variable DESTDIR works as before. It's not set anywhere but will change the tree where the file gets installed. The profiled libraries are no longer built in a different directory than the regular libraries. A new suffix, ".po", is used to denote a profiled object. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= The following variables are common: AFLAGS.${SRC} Flags dependent on source file name. ACFLAGS.${SRC} Flags dependent on source file name. CFLAGS.${SRC} Flags dependent on source file name. CFLAGS.${COMPILER_TYPE} Flags dependent on compiler added to CXXFLAGS. CFLAGS.${MACHINE_ARCH} Architectural flags added to CFLAGS. CFLAGS_NO_SIMD Add this to CFLAGS for programs that don't want any SIMD instructions generated. It is setup in bsd.cpu.mk to an appropriate value for the compiler and target. CXXFLAGS.${COMPILER_TYPE} Flags dependent on compiler added to CXXFLAGS. CXXFLAGS.${MACHINE_ARCH} Architectural flags added to CXXFLAGS. CXXFLAGS.${SRC} Flags dependent on source file name. COMPILER_FEATURES A list of features that the compiler supports. Zero or more of: c++11 Supports full C++ 11 standard. COMPILER_TYPE Type of compiler, either clang or gcc, though other values are possible. Don't assume != clang == gcc. COMPILER_VERSION A numeric constant equal to: major * 10000 + minor * 100 + tiny for the compiler's self-reported version. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= The include file has the default rules for all makes, in the BSD environment or otherwise. You probably don't want to touch this file. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= The include file includes other Makefiles for specific architectures, if they exist. It will include the first of the following files that it finds: Makefile.${MACHINE}, Makefile.${MACHINE_ARCH}, Makefile.${MACHINE_CPUARCH} =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= The include file handles installing manual pages and their links. It has three targets: all-man: build manual pages. maninstall: install the manual pages and their links. manlint: verify the validity of manual pages. 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. MAN 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 hard-linked. The include file includes a file named "../Makefile.inc" if it exists. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= The include file 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. 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 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 and any object files. 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: AFLAGS Flags to the assembler when assembling .s files. ACFLAGS Flags to the compiler when preprocessing and assembling .S files. 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. CFLAGS Flags to the compiler when creating C objects. FILES A list of non-executable files. The installation is controlled by the FILESNAME, FILESOWN, FILESGRP, FILESMODE, FILESDIR variables that can be further specialized by FILES_. LDADD Additional loader objects. Usually used for libraries. For example, to load with the compatibility and utility libraries, use: LDADD=-lutil -lcompat LIBADD Additional libraries. This is for base system libraries and is only valid inside of the /usr/src tree. Rather than use LDADD=-lname use LIBADD=name. LDFLAGS Additional loader flags. Passed to the loader via CC, since that's used to link programs as well, so loader specific flags need to be prefixed with -Wl, to work. 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 ${DESTDIR}/bin/[ MAN Manual pages (should end in .1 - .9). If no MAN variable is defined, "MAN=${PROG}.1" is assumed. PROG The name of the program to build. If not supplied, nothing is built. PROG_CXX If defined, the name of the program to build. Also causes to link the program with the standard C++ library. PROG_CXX overrides the value of PROG if PROG is also set. PROGS When used with , allow building multiple PROGS_CXX PROG and PROGS_CXX in one Makefile. To define individual variables for each program the VAR.prog syntax should be used. For example: PROGS= foo bar SRCS.foo= foo_src.c LDADD.foo= -lutil SRCS.bar= bar_src.c The supported variables are: - BINDIR - BINGRP - BINMODE - BINOWN - CFLAGS - CXXFLAGS - DEBUG_FLAGS - DPADD - DPSRCS - LDADD - LDFLAGS - LIBADD - LINKS - MAN - MLINKS - NO_WERROR - PROGNAME - SRCS - STRIP - WARNS PROGNAME The name that the above program will be installed as, if different from ${PROG}. SRCS List of source files to build the program. If SRCS is not defined, it's assumed to be ${PROG}.c or, if PROG_CXX is defined, ${PROG_CXX}.cc. DPADD Additional dependencies for the program. Usually used for libraries. For example, to depend on the compatibility and utility libraries use: DPADD=${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. 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. SUBDIR A list of subdirectories that should be built as well. Each of the targets will execute the same target in the subdirectories. SCRIPTS A list of interpreter scripts [file.{sh,csh,pl,awk,...}]. The installation is controlled by the SCRIPTSNAME, SCRIPTSOWN, SCRIPTSGRP, SCRIPTSMODE, SCRIPTSDIR variables that can be further specialized by SCRIPTS_