style.Makefile man page on FreeBSD

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STYLE.MAKEFILE(5)	    BSD File Formats Manual	     STYLE.MAKEFILE(5)

     style.Makefile — FreeBSD Makefile file style guide

     This file specifies the preferred style for makefiles in the FreeBSD
     source tree.

     ·	 All makefiles should have an SCM ID at the start of the file, fol‐
	 lowed by a blank line.

	 # $FreeBSD$

     ·	 .PATH: comes next if needed, and is spelled “.PATH: ”, with a single
	 ASCII space after a colon.  Do not use the VPATH variable.

     ·	 Special variables (i.e., LIB, SRCS, MLINKS, etc.) are listed in order
	 of “product”, then building and installing a binary.  Special vari‐
	 ables may also be listed in “build” order: i.e., ones for the primary
	 program (or library) first.  The general “product” order is:
	 CFLAGS DPADD LDADD.  The general “build” order is:

     ·	 Omit SRCS when using <> and there is a single source file
	 named the same as the PROG.

     ·	 Omit MAN when using <> and the manual page is named the
	 same as the PROG, and is in section 1.

     ·	 All variable assignments are spelled “VAR=”, i.e., no space between
	 the variable name and the =.  Keep values sorted alphabetically, if

     ·	 Do not use += to set variables that are only set once (or to set
	 variables for the first time).

     ·	 Do not use vertical whitespace in simple makefiles, but do use it to
	 group locally related things in more complex/longer ones.

     ·	 WARNS comes before CFLAGS, as it is basically a CFLAGS modifier.  It
	 comes before CFLAGS rather than after CFLAGS so it does not get lost
	 in a sea of CFLAGS statements as WARNS is an important thing.	The
	 usage of WARNS is spelled “WARNS?= ”, so that it may be overridden on
	 the command line or in make.conf(5).

     ·	 “NO_WERROR= yes” should not be used, it defeats the purpose of WARNS.
	 It should only be used on the command line and in special circum‐

     ·	 CFLAGS is spelled “CFLAGS+= ”.

     ·	 Listing -D's before -I's in CFLAGS is preferred for alphabetical
	 ordering and to make -D's easier to see.  The -D's often affect con‐
	 ditional compilation, and -I's tend to be quite long.	Split long
	 CFLAGS settings between the -D's and -I's.

     ·	 Do not use GCCisms (such as -g and -Wall) in CFLAGS.

     ·	 Typically, there is one ASCII tab between VAR= and the value in order
	 to start the value in column 9.  An ASCII space is allowed for vari‐
	 able names that extend beyond column 9.  A lack of whitespace is also
	 allowed for very long variable names.

     ·	 .include <bsd.*.mk> goes last.

     ·	 Do not use anachronisms like $< and $@.  Instead use ${.IMPSRC} or
	 ${.ALLSRC} and ${.TARGET}.

     ·	 To not build the “foo” part of the base system, use NO_FOO, not

     ·	 To optionally build something in the base system, spell the knob
	 WITH_FOO not WANT_FOO or USE_FOO.  The latter are reserved for the
	 FreeBSD Ports Collection.

     ·	 For variables that are only checked with defined(), do not provide
	 any fake value.

     The desire to express a logical grouping often means not obeying some of
     the above.

     The simplest program Makefile is:

	   # $FreeBSD$

	   PROG=   foo

	   .include <>

     The simplest library Makefile is:

	   # $FreeBSD$

	   LIB=	   foo
	   MAN=	   libfoo.3
	   SRCS=   foo.c

	   .include <>

     make(1), make.conf(5), style(9)

     This manual page is inspired from the same source as style(9) manual page
     in FreeBSD.

     There are few hard and fast style rules here.  The style of many things
     is too dependent on the context of the whole makefile, or the lines sur‐
     rounding it.

BSD				January 8, 2005				   BSD

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