MAKE(1)                    OpenBSD Reference Manual                    MAKE(1)

NAME
     make - maintain program dependencies

SYNOPSIS
     make [-BPSeiknqrst] [-D variable] [-d flags] [-f makefile] [-I directory]
          [-j max_jobs] [-m directory] [-V variable] [variable=value] [target
          ...]

DESCRIPTION
     make is a program designed to simplify the maintenance of other programs.
     Its input is a list of specifications as to the files upon which programs
     and other files depend.  If the file `BSDmakefile' exists, it is read for
     this list of specifications.  If it does not exist, the files `makefile'
     and `Makefile' are tried in order.  If the file `.depend' exists, it is
     read in addition to the makefile (see mkdep(1)).

     This manual page is intended as a reference document only.  For a more
     thorough introduction to make and makefiles, please refer to Make - A
     Tutorial.

     The options are as follows:

     -B      Try to be backwards compatible by executing a single shell per
             command and by executing the commands to make the sources of a
             dependency line in sequence.  This is turned on by default unless
             -j is used.

     -D variable
             Define variable to be 1.

     -d flags
             Turn on debugging, and specify which portions of make are to
             print debugging information.  flags is one or more of the follow-
             ing:

             A       Print all possible debugging information; equivalent to
                     specifying all of the debugging flags.

             a       Print debugging information about archive searching and
                     caching.

             c       Print debugging information about conditional evaluation.

             d       Print debugging information about directory searching and
                     caching.

             f       Print debugging information about the expansion of for
                     loops.

             g1      Print the input graph before making anything.

             g2      Print the input graph after making everything, or before
                     exiting on error.

             j       Print debugging information about running multiple
                     shells.

             l       Print commands in Makefile targets regardless of whether
                     or not they are prefixed by @.  Also known as loud behav-
                     ior.

             m       Print debugging information about making targets, includ-

                     ing modification dates.

             s       Print debugging information about suffix-transformation
                     rules.

             t       Print debugging information about target list mainte-
                     nance.

             v       Print debugging information about variable assignment.

     -e      Specify that environment variables override macro assignments
             within makefiles.

     -f makefile
             Specify a makefile to read instead of the default `makefile' and
             `Makefile'. If makefile is `-', standard input is read.  Multiple
             makefiles may be specified, and are read in the order specified.

     -I directory
             Specify a directory in which to search for makefiles and included
             makefiles.  The system makefile directory (or directories, see
             the -m option) is automatically included as part of this list.

     -i      Ignore non-zero exit of shell commands in the makefile.  Equiva-
             lent to specifying `-' before each command line in the makefile.

     -j max_jobs
             Specify the maximum number of jobs that make may have running at
             any one time.  Turns compatibility mode off, unless the B flag is
             also specified.

     -k      Continue processing after errors are encountered, but only on
             those targets that do not depend on the target whose creation
             caused the error.

     -m directory
             Specify a directory in which to search for sys.mk and makefiles
             included via the <...> style.  Multiple directories can be added
             to form a search path.  This path will override the default sys-
             tem include path: /usr/share/mk. Furthermore, the system include
             path will be appended to the search path used for "..."-style in-
             clusions (see the -I option).

     -n      Display the commands that would have been executed, but do not
             actually execute them.

     -P      Collate the output of a given job and display it only when the
             job finishes, instead of mixing the output of parallel jobs to-
             gether.  This option has no effect unless -j is used too.

     -q      Do not execute any commands, but exit with status 0 if the speci-
             fied targets are up-to-date, and 1 otherwise.

     -r      Do not use the built-in rules specified in the system makefile.

     -S      Stop processing when an error is encountered.  Default behavior.
             This is needed to negate the -k option during recursive builds.

     -s      Do not echo commands as they are executed.  Equivalent to speci-
             fying `@' before each command line in the makefile.

     -t      Rather than re-building a target as specified in the makefile,
             create it or update its modification time to make it appear up-
             to-date.

     -V variable
             Print make's idea of the value of variable. Do not build any tar-
             gets.  Multiple instances of this option may be specified; the
             variables will be printed one per line, with a blank line for
             each null or undefined variable.

     variable=value
             Set the value of the variable variable to value.

     There are seven different types of lines in a makefile: file dependency
     specifications, shell commands, variable assignments, include statements,
     conditional directives, for loops, and comments.

     In general, lines may be continued from one line to the next by ending
     them with a backslash (`\'). The trailing newline character and initial
     whitespace on the following line are compressed into a single space.

FILE DEPENDENCY SPECIFICATIONS
     Dependency lines consist of one or more targets, an operator, and zero or
     more sources.  This creates a relationship where the targets ``depend''
     on the sources and are usually created from them.  The exact relationship
     between the target and the source is determined by the operator that sep-
     arates them.  The operators are as follows:

     :     A target is considered out-of-date if its modification time is less
           than those of any of its sources.  Sources for a target accumulate
           over dependency lines when this operator is used.  The target is
           removed if make is interrupted.

     !     Targets are always re-created, but not until all sources have been
           examined and re-created as necessary.  Sources for a target accumu-
           late over dependency lines when this operator is used.  The target
           is removed if make is interrupted.

     ::    If no sources are specified, the target is always re-created.  Oth-
           erwise, a target is considered out-of-date if any of its sources
           has been modified more recently than the target.  Sources for a
           target do not accumulate over dependency lines when this operator
           is used.  The target will not be removed if make is interrupted.

     Targets and sources may contain the shell wildcard expressions `?', `*',
     `[]' and `{}'. The expressions `?', `*' and `[]' may only be used as part
     of the final component of the target or source, and must be used to de-
     scribe existing files.  The expression `{}' need not necessarily be used
     to describe existing files.  Expansion is in directory order, not alpha-
     betically as done in the shell.

SHELL COMMANDS
     Each target may have associated with it a series of shell commands, nor-
     mally used to create the target.  Each of the commands in this script
     must be preceded by a tab.  While any target may appear on a dependency
     line, only one of these dependencies may be followed by a creation
     script, unless the `::' operator is used.

     If a command line begins with a combination of the characters, `@', `-'
     and/or `+', the command is treated specially.

     `@'  causes the command not to be echoed before it is executed.

     `-'  causes any non-zero exit status of the command line to be ignored.

     `+'  causes the command to be executed even if -n has been specified
          (This can be useful to debug recursive Makefiles).

VARIABLE ASSIGNMENTS
     Variables in make are much like variables in the shell, and, by tradi-
     tion, consist of all upper-case letters.  The five operators that can be

     used to assign values to variables are as follows:

     =       Assign the value to the variable.  Any previous value is overrid-
             den.

     +=      Append the value to the current value of the variable.

     ?=      Assign the value to the variable if it is not already defined.

     :=      Assign with expansion, i.e., expand the value before assigning it
             to the variable.  Normally, expansion is not done until the vari-
             able is referenced.

     !=      Expand the value and pass it to the shell for execution and as-
             sign the result to the variable.  Any newlines in the result are
             replaced with spaces.

     Any whitespace before the assigned value is removed; if the value is be-
     ing appended, a single space is inserted between the previous contents of
     the variable and the appended value.

     Variables are expanded by surrounding the variable name with either curly
     braces (`{}') or parentheses (`()') and preceding it with a dollar sign
     (`$'). If the variable name contains only a single letter, the surround-
     ing braces or parentheses are not required.  This shorter form is not
     recommended.

     Variable substitution occurs at two distinct times, depending on where
     the variable is being used.  Variables in dependency lines are expanded
     as the line is read.  Variables in shell commands are expanded when the
     shell command is executed.

     The four different classes of variables (in order of increasing prece-
     dence) are:

     Environment variables
             Variables defined as part of make's environment.

     Global variables
             Variables defined in the makefile or in included makefiles.

     Command line variables
             Variables defined as part of the command line.

     Local variables
             Variables that are defined specific to a certain target.  The
             seven local variables are as follows:

             .ALLSRC   The list of all sources for this target; also known as
                       `>'.

             .ARCHIVE  The name of the archive file; also known as `!'.

             .IMPSRC   The name/path of the source from which the target is to
                       be transformed (the ``implied'' source); also known as
                       `<'.

             .MEMBER   The name of the archive member; also known as `%'.

             .OODATE   The list of sources for this target that were deemed
                       out-of-date; also known as `?'.

             .PREFIX   The file prefix of the file, containing only the file
                       portion, no suffix or preceding directory components;

                       also known as `*'.

             .TARGET   The name of the target; also known as `@'.

             The shorter forms `@', `!', `<', `%', `?', `>', and `*' are per-
             mitted for backward compatibility with historical makefiles and
             are not recommended.  The six variables `@F', `@D', `<F', `<D',
             `*F', and `*D' are permitted for compatibility with AT&T System V
             UNIX makefiles and are not recommended.

             Four of the local variables may be used in sources on dependency
             lines because they expand to the proper value for each target on
             the line.  These variables are `.TARGET', `.PREFIX', `.ARCHIVE',
             and `.MEMBER'.

     In addition, make sets or knows about the following internal variables,
     or environment variables:

     $          A single dollar sign `$', i.e., `$$' expands to a single dol-
                lar sign.

     .MAKE      The name that make was executed with (argv[0]).

     .CURDIR    A path to the directory where make was executed.

     .OBJDIR    A path to the directory where the targets are built.  At
                startup, make searches for an alternate directory to place
                target files -- it will attempt to change into this special
                directory.  First, if MAKEOBJDIRPREFIX is defined, make
                prepends its contents to the current directory name and tries
                for the resulting directory.  If that fails, make remains in
                the current directory.  If MAKEOBJDIRPREFIX is not defined,
                make checks MAKEOBJDIR and tries to change into that directo-
                ry.  Should that fail, make remains in the current directory.
                If MAKEOBJDIR is not defined, it tries to change into the di-
                rectory named obj.${MACHINE} (see MACHINE variable).  If it
                still has found no special directory, make next tries the di-
                rectory named obj. If this fails, make tries to prepend
                /usr/obj to the current directory name.  Finally, if none of
                these directories are available make will settle for and use
                the current directory.

     .MAKEFLAGS
                The environment variable MAKEFLAGS may contain anything that
                may be specified on make's command line.  Its contents are
                stored in make's .MAKEFLAGS variable.  Anything specified on
                make's command line is appended to the .MAKEFLAGS variable
                which is then entered into the environment as MAKEFLAGS for
                all programs which make executes.

     MFLAGS     A shorter synonym for .MAKEFLAGS.

     PWD        Alternate path to the current directory.  make normally sets
                `.CURDIR' to the canonical path given by getcwd(2). However,
                if the environment variable PWD is set and gives a path to the
                current directory, then make sets `.CURDIR' to the value of
                PWD instead.  PWD is always set to the value of `.OBJDIR' for
                all programs which make executes.

     .TARGETS   List of targets make is currently building.

     .INCLUDES  See .INCLUDES special target

     .LIBS      See .LIBS special target

     MACHINE    Name of the machine architecture make is running on, obtained
                from the MACHINE environment variable, or through uname(2) if
                not defined.

     MACHINE_ARCH
                Name of the machine architecture make was compiled for, ob-
                tained from the MACHINE_ARCH environment variable, or defined
                at compilation time.

     Variable expansion may be modified to select or modify each word of the
     variable (where a ``word'' is whitespace delimited sequence of charac-
     ters).  The general format of a variable expansion is as follows:

           {variable[:modifier[:...]]}

     Each modifier begins with a colon and one of the following special char-
     acters.  The colon may be escaped with a backslash (`\').

     E           Replaces each word in the variable with its suffix.

     H           Replaces each word in the variable with everything but the
                 last component.

     L           Replaces each word in the variable with its lower case equiv-
                 alent.

     U           Replaces each word in the variable with its upper case equiv-
                 alent.

     Mpattern    Select only those words that match the rest of the modifier.
                 The standard shell wildcard characters (`*', `?', and `[]')
                 may be used.  The wildcard characters may be escaped with a
                 backslash (`\').

     Npattern    This is identical to M, but selects all words which do not
                 match the rest of the modifier.

     Q           Quotes every shell meta-character in the variable, so that it
                 can be passed safely through recursive invocations of make.

     R           Replaces each word in the variable with everything but its
                 suffix.

     S/old_string/new_string/[1g]
                 Modify the first occurrence of old_string in the variable's
                 value, replacing it with new_string. If a `g' is appended to
                 the last slash of the pattern, all occurrences in each word
                 are replaced.  If a `1' is appended to the last slash of the
                 pattern, only the first word is affected.  If old_string be-
                 gins with a caret (`^'), old_string is anchored at the begin-
                 ning of each word.  If old_string ends with a dollar sign
                 (`$'), it is anchored at the end of each word.  Inside
                 new_string, an ampersand (`&') is replaced by old_string
                 (without any `^' or `$'). Any character may be used as a de-
                 limiter for the parts of the modifier string.  The anchoring,
                 ampersand and delimiter characters may be escaped with a
                 backslash (`\').

                 Variable expansion occurs in the normal fashion inside both
                 old_string and new_string with the single exception that a
                 backslash is used to prevent the expansion of a dollar sign
                 (`$'), not a preceding dollar sign as is usual.

     C/pattern/replacement/[1g]
                 The C modifier is just like the S modifier except that the
                 old and new strings, instead of being simple strings, are a
                 regular expression (see regex(3)) and an ed(1)-style replace-
                 ment string.  Normally, the first occurrence of the pattern
                 in each word of the value is changed.  The `1' modifier caus-
                 es the substitution to apply to at most one word; the `g'
                 modifier causes the substitution to apply to as many in-
                 stances of the search pattern as occur in the word or words
                 it is found in.  Note that `1' and `g' are orthogonal; the
                 former specifies whether multiple words are potentially af-
                 fected, the latter whether multiple substitutions can poten-
                 tially occur within each affected word.

     T           Replaces each word in the variable with its last component.

     old_string=new_string
                 This is the AT&T System V UNIX style variable substitution.
                 It must be the last modifier specified.  If old_string or
                 new_string do not contain the pattern matching character %
                 then it is assumed that they are anchored at the end of each
                 word, so only suffixes or entire words may be replaced.  Oth-
                 erwise % is the substring of old_string to be replaced in
                 new_string

INCLUDE STATEMENTS, CONDITIONALS AND FOR LOOPS
     Makefile inclusion, conditional structures and for loops reminiscent of
     the C programming language are provided in make. All such structures are
     identified by a line beginning with a single dot (`.') character.  Files
     are included with either `.include <file>' or `.include "file"'. Vari-
     ables between the angle brackets or double quotes are expanded to form
     the file name.  If angle brackets are used, the included makefile is ex-
     pected to be in the system makefile directory.  If double quotes are
     used, the including makefile's directory and any directories specified
     using the -I option are searched before the system makefile directory.

     Conditional expressions are also preceded by a single dot as the first
     character of a line.  The possible conditionals are as follows:

     .undef variable
             Un-define the specified global variable.  Only global variables
             may be un-defined.

     .if [!]expression [operator expression ...]
             Test the value of an expression.

     .ifdef [!]variable [operator variable ...]
             Test the value of a variable.

     .ifndef [!]variable [operator variable ...]
             Test the value of a variable.

     .ifmake [!]target [operator target ...]
             Test the target being built.

     .ifnmake [!]target [operator target ...]
             Test the target being built.

     .else   Reverse the sense of the last conditional.

     .elif [!]expression [operator expression ...]
             A combination of `.else' followed by `.if'.

     .elifdef [!]variable [operator variable ...]
             A combination of `.else' followed by `.ifdef'.

     .elifndef [!]variable [operator variable ...]
             A combination of `.else' followed by `.ifndef'.

     .elifmake [!]target [operator target ...]

             A combination of `.else' followed by `.ifmake'.

     .elifnmake [!]target [operator target ...]
             A combination of `.else' followed by `.ifnmake'.

     .endif  End the body of the conditional.

     The operator may be any one of the following:

     ||     logical OR

     &&     Logical AND; of higher precedence than ``''.

     As in C, make will only evaluate a conditional as far as is necessary to
     determine its value.  Parentheses may be used to change the order of
     evaluation.  The boolean operator `!' may be used to logically negate an
     entire conditional.  It is of higher precedence than `&&'.

     The value of expression may be any of the following:

     defined     Takes a variable name as an argument and evaluates to true if
                 the variable has been defined.

     make        Takes a target name as an argument and evaluates to true if
                 the target was specified as part of make's command line or
                 was declared the default target (either implicitly or explic-
                 itly, see .MAIN) before the line containing the conditional.

     empty       Takes a variable, with possible modifiers, and evaluates to
                 true if the expansion of the variable would result in an emp-
                 ty string.

     exists      Takes a file name as an argument and evaluates to true if the
                 file exists.  The file is searched for on the system search
                 path (see .PATH).

     target      Takes a target name as an argument and evaluates to true if
                 the target has been defined.

     expression may also be an arithmetic or string comparison.  Variable ex-
     pansion is performed on both sides of the comparison, after which the in-
     tegral values are compared.  A value is interpreted as hexadecimal if it
     is preceded by 0x, otherwise it is decimal; octal numbers are not sup-
     ported.  The standard C relational operators are all supported.  If after
     variable expansion, either the left or right hand side of a `==' or `!='
     operator is not an integral value, then string comparison is performed
     between the expanded variables.  If no relational operator is given, it
     is assumed that the expanded variable is being compared against 0.

     When make is evaluating one of these conditional expressions, and it en-
     counters a word it doesn't recognize, either the ``make'' or ``defined''
     expression is applied to it, depending on the form of the conditional.
     If the form is `.ifdef' or `.ifndef', the ``defined'' expression is ap-
     plied.  Similarly, if the form is `.ifmake' or `.ifnmake', the ``make''
     expression is applied.

     If the conditional evaluates to true the parsing of the makefile contin-
     ues as before.  If it evaluates to false, the following lines are
     skipped.  In both cases this continues until a `.else' or `.endif' is
     found.

     For loops are typically used to apply a set of rules to a list of files.
     The syntax of a for loop is:

     .for variable [variable ...] in expression

             <make-rules>



     .endfor
     After the for expression is evaluated, it is split into words.  On each
     iteration of the loop, one word is assigned to each variable, in order,
     and these variables are substituted in the make-rules inside the body of
     the for loop.  The number of words must match the number of iteration
     variables; that is, if there are three iteration variables, the number of
     words must be a multiple a three.

COMMENTS
     Comments begin with a hash (`#') character, anywhere but in a shell com-
     mand line, and continue to the end of the line.

SPECIAL SOURCES
     .IGNORE     Ignore any errors from the commands associated with this tar-
                 get, exactly as if they all were preceded by a dash (`-').

     .MADE       Mark all sources of this target as being up-to-date.

     .MAKE       Execute the commands associated with this target even if the
                 -n or -t options were specified.  Normally used to mark re-
                 cursive make's.

     .NOTMAIN    Normally make selects the first target it encounters as the
                 default target to be built if no target was specified.  This
                 source prevents this target from being selected.

     .OPTIONAL   If a target is marked with this attribute and make can't fig-
                 ure out how to create it, it will ignore this fact and assume
                 the file isn't needed or already exists.

     .PRECIOUS   When make is interrupted, it removes any partially made tar-
                 gets.  This source prevents the target from being removed.

     .SILENT     Do not echo any of the commands associated with this target,
                 exactly as if they all were preceded by an at sign (`@').

     .USE        Turn the target into make's version of a macro.  When the
                 target is used as a source for another target, the other tar-
                 get acquires the commands, sources, and attributes (except
                 for .USE) of the source.  If the target already has commands,
                 the .USE target's commands are appended to them.

     .WAIT       If special .WAIT source is appears in a dependency line, the
                 sources that precede it are made before the sources that suc-
                 ceed it in the line.  Loops are not being detected and tar-
                 gets that form loops will be silently ignored.

SPECIAL TARGETS
     Special targets may not be included with other targets, i.e., they must
     be the only target specified.

     .BEGIN      Any command lines attached to this target are executed before
                 anything else is done.

     .DEFAULT    This is sort of a .USE rule for any target (that was used on-
                 ly as a source) that make can't figure out any other way to
                 create.  Only the shell script is used.  The .IMPSRC variable
                 of a target that inherits .DEFAULT's commands is set to the
                 target's own name.

     .END        Any command lines attached to this target are executed after

                 everything else is done.

     .IGNORE     Mark each of the sources with the .IGNORE attribute.  If no
                 sources are specified, this is the equivalent of specifying
                 the -i option.

     .INCLUDES   A list of suffixes that indicate files that can be included
                 in a source file.  The suffix must have already been declared
                 with .SUFFIXES, any suffix so declared will have the directo-
                 ries on its search path (see .PATH) placed in the .INCLUDES
                 special variable, each preceded by a -I flag.

     .INTERRUPT  If make is interrupted, the commands for this target will be
                 executed.

     .LIBS       This does for libraries what .INCLUDES does for include
                 files, except that the flag used is -L.

     .MAIN       If no target is specified when make is invoked, this target
                 will be built.  This is always set, either explicitly, or im-
                 plicitly when make selects the default target, to give the
                 user a way to refer to the default target on the command
                 line.

     .MAKEFLAGS  This target provides a way to specify flags for make when the
                 makefile is used.  The flags are as if typed to the shell,
                 though the -f option will have no effect.

     .NOTPARALLEL
                 Disable parallel mode.

     .NO_PARALLEL
                 Same as above, for compatibility with other pmake variants.

     .ORDER      The named targets are made in sequence.

     .PATH       The sources are directories which are to be searched for
                 files not found in the current directory.  If no sources are
                 specified, any previously specified directories are deleted.

     .PATHsuffix
                 The sources are directories which are to be searched for suf-
                 fixed files not found in the current directory.  make first
                 searches the suffixed search path, before reverting to the
                 default path if the file is not found there.

     .PHONY      Apply the .PHONY attribute to any specified sources.  Targets
                 with this attribute are always considered to be out of date.

     .PRECIOUS   Apply the .PRECIOUS attribute to any specified sources.  If
                 no sources are specified, the .PRECIOUS attribute is applied
                 to every target in the file.

     .SILENT     Apply the .SILENT attribute to any specified sources.  If no
                 sources are specified, the .SILENT attribute is applied to
                 every command in the file.

     .SUFFIXES   Each source specifies a suffix to make. If no sources are
                 specified, any previous specified suffices are deleted.

ENVIRONMENT
     make uses the following environment variables, if they exist: MACHINE,
     MACHINE_ARCH, MAKEFLAGS, MAKEOBJDIR, MAKEOBJDIRPREFIX, and PWD. make also
     ignores and unsets CDPATH.

FILES
     .depend        list of dependencies
     BSDmakefile    list of dependencies
     Makefile       list of dependencies
     makefile       list of dependencies
     sys.mk         system makefile
     /usr/share/mk  system makefile directory default MAKEOBJDIRPREFIX
                    directory.

SEE ALSO
     mkdep(1)

     Make - A Tutorial.

COMPATIBILITY
     Older versions of make used MAKE instead of MAKEFLAGS. This was removed
     for POSIX compatibility.  The internal variable MAKE is set to the same
     value as .MAKE, support for this may be removed in the future.

     Most of the more esoteric features of make should probably be avoided for
     greater compatibility.

HISTORY
     A make command appeared in Version 7 AT&T UNIX.

BUGS
     The determination of .OBJDIR is contorted to the point of absurdity.

     If you specify the same target several times in normal dependency rules,
     make silently ignores all commands after the first non empty set of com-
     mands, e.g., in

     a:
             @echo "Executed"
     a:
             @echo "Bad luck"

     @echo "Bad luck" will be silently ignored.

     .TARGETS is not set to the default target when make is invoked without a
     target name and no MAIN special target exists.

     The evaluation of expression in a test is very simple-minded.  Currently,
     the only form that works is `.if ${VAR} op something' For instance, you
     should write tests as `.if ${VAR} = string' not the other way around,
     which doesn't work.

     For loops are expanded before tests, so a fragment such as:

     .for TMACHINE in ${SHARED_ARCHS}
     .if ${TMACHINE} = ${MACHINE}
          ...
     .endif
     .endfor

     won't work, and should be rewritten the other way around.

     When handling pre-BSD 4.4 archives, make may erroneously mark archive
     members as out of date if the archive name was truncated.

     The handling of ; and other special characters in tests may be utterly
     bogus.  For instance, in

     A=abcd;c.c
     .if ${A:R} == "abcd;c"

     the test will never match, even though the value is correct.

     The conditional handler is incredibly lame.  Junk such as

     .if defined anything goes (A)

     will be accepted silently.

     In a .for loop, only the variable value is used, assignments will be
     evaluated later, e.g., in

     .for I in a b c d
     I:=${I:S/a/z}
     A+=$I
     .endfor
     A will evaluate to a b c d after the loop, not z b c d.

     The `+' command modificator is ignored in parallel make mode.

OpenBSD 3.0                     March 19, 1994                              12
