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32 .\" from: @(#)make.1 8.4 (Berkeley) 3/19/94
33 .\" $FreeBSD: src/usr.bin/make/make.1,v 1.29.2.15 2002/12/17 19:01:18 seanc Exp $
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41 .Nd maintain program dependencies
56 .Op Ar variable Ns No = Ns Ar value
61 utility is a program designed to simplify the maintenance of other programs.
62 Its input is a list of specifications
63 describing dependency relationships between the generation of
69 that can be found in either the current directory or a special object directory
72 will be read for this list of specifications.
75 can be found, it is also read (see
78 This manual page is intended as a reference document only.
79 For a more thorough introduction to
81 and makefiles, please refer to
82 .%T "Make \- A Tutorial" .
84 The options are as follows:
87 Try to be backwards compatible by executing a single shell per command and
88 by executing the commands to make the sources of a dependency line in sequence.
89 This is turned on by default unless
99 to be 1, in the global context.
101 Turn on debugging, and specify which portions of
103 are to print debugging information.
106 is one or more of the following:
109 Print all possible debugging information;
110 equivalent to specifying all of the debugging flags.
112 Print debugging information about archive searching and caching.
114 Print debugging information about conditional evaluation.
116 Print debugging information about directory searching and caching.
118 Print debugging information about the execution of for loops.
122 Print the input graph before making anything.
124 Print the input graph after making everything, or before exiting
127 Print debugging information about running multiple shells.
129 Print commands in Makefiles regardless of whether or not they are prefixed
130 by @ or other "quiet" flags.
131 Also known as "loud" behavior.
133 Print debugging information about making targets, including modification
136 Print debugging information about suffix-transformation rules.
138 Print debugging information about target list maintenance.
140 Print debugging information about variable assignment.
143 Specify a variable whose environment value (if any) will override
144 macro assignments within makefiles.
146 Specify that environment values override macro assignments within
147 makefiles for all variables.
149 Specify a makefile to read instead of the default
157 standard input is read.
158 Multiple makefiles may be specified, and are read in the order specified.
159 .It Fl I Ar directory
160 Specify a directory in which to search for makefiles and included makefiles.
161 The system makefile directory (or directories, see the
163 option) is automatically included as part of this list.
165 Ignore non-zero exit of shell commands in the makefile.
166 Equivalent to specifying
168 before each command line in the makefile.
170 Specify the maximum number of jobs that
172 may have running at any one time.
173 Turns compatibility mode off, unless the
175 flag is also specified.
177 Continue processing after errors are encountered, but only on those targets
178 that do not depend on the target whose creation caused the error.
179 .It Fl m Ar directory
180 Specify a directory in which to search for sys.mk and makefiles included
182 Multiple directories can be added to form a search path.
183 This path will override the default system include path:
185 Furthermore, the system include path will be appended to the search path used
186 for "..."-style inclusions (see the
190 Display the commands that would have been executed, but do not actually
193 Collate the output of a given job and display it only when the job finishes,
194 instead of mixing the output of parallel jobs together.
195 This option has no effect unless
199 Do not execute any commands, but exit 0 if the specified targets are
200 up-to-date and 1, otherwise.
202 Do not use the built-in rules specified in the system makefile.
204 Stop processing when an error is encountered.
206 This is needed to negate the
208 option during recursive builds.
210 Do not echo any commands as they are executed.
211 Equivalent to specifying
213 before each command line in the makefile.
215 Rather than re-building a target as specified in the makefile, create it
216 or update its modification time to make it appear up-to-date.
222 in the global context.
223 Do not build any targets.
224 Multiple instances of this option may be specified;
225 the variables will be printed one per line,
226 with a blank line for each null or undefined variable.
229 For multi-job makes, this will cause file banners to be generated.
233 option to print the values of variables,
234 do not recursively expand the values.
235 .It Ar variable Ns No = Ns Ar value
236 Set the value of the variable
242 There are seven different types of lines in a makefile: file dependency
243 specifications, shell commands, variable assignments, include statements,
244 conditional directives, for loops, and comments.
246 In general, lines may be continued from one line to the next by ending
247 them with a backslash
249 The trailing newline character and initial whitespace on the following
250 line are compressed into a single space.
251 .Sh FILE DEPENDENCY SPECIFICATIONS
252 Dependency lines consist of one or more targets, an operator, and zero
254 This creates a relationship where the targets
257 and are usually created from them.
258 The exact relationship between the target and the source is determined
259 by the operator that separates them.
260 The three operators are as follows:
263 A target is considered out-of-date if its modification time is less than
264 those of any of its sources.
265 Sources for a target accumulate over dependency lines when this operator
267 The target is removed if
271 Targets are always re-created, but not until all sources have been
272 examined and re-created as necessary.
273 Sources for a target accumulate over dependency lines when this operator
275 The target is removed if
279 If no sources are specified, the target is always re-created.
280 Otherwise, a target is considered out-of-date if any of its sources has
281 been modified more recently than the target.
282 Sources for a target do not accumulate over dependency lines when this
284 The target will not be removed if
289 Targets and sources may contain the shell wildcard expressions
300 may only be used as part of the final
301 component of the target or source, and must be used to describe existing
305 need not necessarily be used to describe existing files.
306 Expansion is in directory order, not alphabetically as done in the shell.
308 Each target may have associated with it a series of shell commands, normally
309 used to create the target.
310 Each of the commands in this script
312 be preceded by a tab.
313 While any target may appear on a dependency line, only one of these
314 dependencies may be followed by a creation script, unless the
318 If the first or first two characters of the command line are
322 the command is treated specially.
325 causes the command not to be echoed before it is executed.
328 causes any non-zero exit status of the command line to be ignored.
329 .Sh VARIABLE ASSIGNMENTS
332 are much like variables in the shell, and, by tradition,
333 consist of all upper-case letters.
334 The five operators that can be used to assign values to variables are as
338 Assign the value to the variable.
339 Any previous value is overridden.
341 Append the value to the current value of the variable.
343 Assign the value to the variable if it is not already defined.
345 Assign with expansion, i.e. expand the value before assigning it
347 Normally, expansion is not done until the variable is referenced.
349 Expand the value and pass it to the shell for execution and assign
350 the result to the variable.
351 Any newlines in the result are replaced with spaces.
354 Any whitespace before the assigned
356 is removed; if the value is being appended, a single space is inserted
357 between the previous contents of the variable and the appended value.
359 Variables are expanded by surrounding the variable name with either
364 and preceding it with
367 If the variable name contains only a single letter, the surrounding
368 braces or parentheses are not required.
369 This shorter form is not recommended.
371 Variable substitution occurs at two distinct times, depending on where
372 the variable is being used.
373 Variables in dependency lines are expanded as the line is read.
374 Variables in shell commands are expanded when the shell command is
377 The four different classes of variables (in order of increasing precedence)
380 .It Environment variables
381 Variables defined as part of
385 Variables defined in the makefile or in included makefiles.
386 .It Command line variables
387 Variables defined as part of the command line.
389 Variables that are defined specific to a certain target.
390 The seven local variables are as follows:
391 .Bl -tag -width ".ARCHIVE"
393 The list of all sources for this target; also known as
396 The name of the archive file; also known as
399 The name/path of the source from which the target is to be transformed
402 source); also known as
405 The name of the archive member; also known as
408 The list of sources for this target that were deemed out-of-date; also
412 The file prefix of the file, containing only the file portion, no suffix
413 or preceding directory components; also known as
416 The name of the target; also known as
429 are permitted for backward
430 compatibility and are not recommended.
440 permitted for compatibility with
442 makefiles and are not recommended.
444 Four of the local variables may be used in sources on dependency lines
445 because they expand to the proper value for each target on the line.
456 sets or knows about the following internal variables or environment
458 .Bl -tag -width MAKEFLAGS
464 expands to a single dollar
470 .Pq Va argv Ns Op 0 .
472 A path to the directory where
479 to the canonical path given by
482 A path to the directory where the targets are built.
485 searches for an alternate directory to place target files.
486 It will attempt to change into this special directory
487 and will search this directory for makefiles
488 not found in the current directory.
489 The following directories are tried in order:
493 ${MAKEOBJDIRPREFIX}/`pwd`
504 The first directory that
506 successfully changes into is used.
511 is set in the environment but
513 is unable to change into the corresponding directory,
514 then the current directory is used
515 without checking the remainder of the list.
516 If they are undefined and
518 is unable to change into any of the remaining three directories,
519 then the current directory is used.
521 The environment variable
523 may contain anything that
527 Its contents are stored in
531 Anything specified on
533 command line is appended to the
535 variable which is then
536 entered into the environment as
538 for all programs which
544 provided for backward compatibility.
546 Alternate path to the current directory.
547 Supported if built with WANT_ENV_PWD defined.
551 to the canonical path given by
553 However, if the environment variable
555 is set and gives a path to the current directory, then
563 is always set to the value of
565 for all programs which
571 is currently building.
581 Name of the machine architecture
583 is running on, obtained from the
585 environment variable, or through
589 Name of the machine architecture
591 was compiled for, defined at compilation time.
593 Makefiles may assign a colon-delimited list of directories to
595 These directories will be searched for source files by
599 has finished parsing all input makefiles.
602 Variable expansion may be modified to select or modify each word of the
605 is whitespace-delimited sequence of characters).
606 The general format of a variable expansion is as follows:
608 .Dl {variable[:modifier[:...]]}
610 Each modifier begins with a colon and one of the following
612 The colon may be escaped with a backslash
616 .It Cm C No \&/ Ar pattern Xo
617 .No \&/ Ar replacement
623 modifier is just like the
625 modifier except that the old and new strings, instead of being
626 simple strings, are an extended regular expression (see
631 Normally, the first occurrence of the pattern in
632 each word of the value is changed.
635 modifier causes the substitution to apply to at most one word; the
637 modifier causes the substitution to apply to as many instances of the
638 search pattern as occur in the word or words it is found in.
643 are orthogonal; the former specifies whether multiple words are
644 potentially affected, the latter whether multiple substitutions can
645 potentially occur within each affected word.
647 Replaces each word in the variable with its suffix.
649 Replaces each word in the variable with everything but the last component.
651 Converts variable to lower-case letters.
652 .It Cm M Ns Ar pattern
653 Select only those words that match the rest of the modifier.
654 The standard shell wildcard characters
661 The wildcard characters may be escaped with a backslash
663 .It Cm N Ns Ar pattern
666 but selects all words which do not match
667 the rest of the modifier.
669 Quotes every shell meta-character in the variable, so that it can be passed
670 safely through recursive invocations of
673 Replaces each word in the variable with everything but its suffix.
675 .It Cm S No \&/ Ar old_string Xo
676 .No \&/ Ar new_string
680 Modify the first occurrence of
682 in each word of the variable's value, replacing it with
686 is appended to the last slash of the pattern, all occurrences
687 in each word are replaced.
693 is anchored at the beginning of each word.
696 ends with a dollar sign
698 it is anchored at the end of each word.
705 Any character may be used as a delimiter for the parts of the modifier
707 The anchoring, ampersand, and delimiter characters may be escaped with a
711 Variable expansion occurs in the normal fashion inside both
715 with the single exception that a backslash is used to prevent the expansion
718 not a preceding dollar sign as is usual.
720 Replaces each word in the variable with its last component.
721 .It Ar old_string=new_string
724 style variable substitution.
725 It must be the last modifier specified.
730 do not contain the pattern matching character
732 then it is assumed that they are
733 anchored at the end of each word, so only suffixes or entire
734 words may be replaced.
742 Converts variable to upper-case letters.
744 .Sh DIRECTIVES, CONDITIONALS, AND FOR LOOPS
745 Directives, conditionals, and for loops reminiscent
746 of the C programming language are provided in
748 All such structures are identified by a line beginning with a single
752 The following directives are supported:
754 .It Ic \&.include Ar <file>
755 .It Ic \&.include Ar \*qfile\*q
756 Include the specified makefile.
757 Variables between the angle brackets
758 or double quotes are expanded to form the file name.
760 are used, the included makefile is expected to be in the system
762 If double quotes are used, the including
763 makefile's directory and any directories specified using the
765 option are searched before the system
767 .It Ic \&.undef Ar variable
768 Un-define the specified global variable.
769 Only global variables may be un-defined.
770 .It Ic \&.makeenv Ar variable
771 Set the environment flag for a preexisting global variable. The current
772 and future contents of the variable will be exported to the environment.
773 .It Ic \&.error Ar message
774 Terminate processing of the makefile immediately.
776 makefile, the line on which the error was encountered and the specified
777 message are printed to standard output and
779 terminates with exit code 1.
780 Variables in the message are expanded.
783 Conditionals are used to determine which parts of the Makefile
785 They are used similarly to the conditionals supported
786 by the C pre-processor.
787 The following conditionals are supported:
791 .Oo \&! Oc Ns Ar expression
792 .Op Ar operator expression ...
794 Test the value of an expression.
797 .Oo \&! Oc Ns Ar variable
798 .Op Ar operator variable ...
800 Test the value of a variable.
803 .Oo \&! Oc Ns Ar variable
804 .Op Ar operator variable ...
806 Test the value of a variable.
809 .Oo \&! Oc Ns Ar target
810 .Op Ar operator target ...
812 Test the target being built.
815 .Oo \&! Oc Ns Ar target
816 .Op Ar operator target ...
818 Test the target being built.
820 Reverse the sense of the last conditional.
823 .Oo \&! Oc Ns Ar expression
824 .Op Ar operator expression ...
832 .Oo \&! Oc Ns Ar variable
833 .Op Ar operator variable ...
841 .Oo \&! Oc Ns Ar variable
842 .Op Ar operator variable ...
850 .Oo \&! Oc Ns Ar target
851 .Op Ar operator target ...
859 .Oo \&! Oc Ns Ar target
860 .Op Ar operator target ...
867 End the body of the conditional.
872 may be any one of the following:
873 .Bl -tag -width "Cm XX"
879 of higher precedence than
885 will only evaluate a conditional as far as is necessary to determine
887 Parentheses may be used to change the order of evaluation.
890 may be used to logically negate an entire
892 It is of higher precedence than
897 may be any of the following:
900 Takes a variable name as an argument and evaluates to true if the variable
903 Takes a target name as an argument and evaluates to true if the target
904 was specified as part of
906 command line or was declared the default target (either implicitly or
909 before the line containing the conditional.
911 Takes a variable, with possible modifiers, and evaluates to true if
912 the expansion of the variable would result in an empty string.
914 Takes a file name as an argument and evaluates to true if the file exists.
915 The file is searched for on the system search path (see
918 Takes a target name as an argument and evaluates to true if the target
924 may also be an arithmetic or string comparison.
925 Variable expansion is
926 performed on both sides of the comparison, after which the integral
928 A value is interpreted as hexadecimal if it is
929 preceded by 0x, otherwise it is decimal; octal numbers are not supported.
930 The standard C relational operators are all supported.
932 variable expansion, either the left or right hand side of a
936 operator is not an integral value, then
937 string comparison is performed between the expanded
939 If no relational operator is given, it is assumed that the expanded
940 variable is being compared against 0.
944 is evaluating one of these conditional expressions, and it encounters
945 a word it doesn't recognize, either the
949 expression is applied to it, depending on the form of the conditional.
956 expression is applied.
957 Similarly, if the form is
963 expression is applied.
965 If the conditional evaluates to true the parsing of the makefile continues
967 If it evaluates to false, the following lines are skipped.
968 In both cases this continues until a
974 For loops are typically used to apply a set of rules to a list of files.
975 The syntax of a for loop is:
977 .Bl -tag -width indent -compact
978 .It Ic .for Ar variable Ic in Ar expression
985 is evaluated, it is split into words.
989 is successively set to each word, and substituted in the
991 inside the body of the for loop.
993 Comments begin with a hash
995 character, anywhere but in a shell
996 command line, and continue to the end of the line.
1000 Ignore any errors from the commands associated with this target, exactly
1001 as if they all were preceded by a dash
1004 Execute the commands associated with this target even if the
1008 options were specified.
1009 Normally used to mark recursive
1014 selects the first target it encounters as the default target to be built
1015 if no target was specified.
1016 This source prevents this target from being selected.
1018 If a target is marked with this attribute and
1020 can't figure out how to create it, it will ignore this fact and assume
1021 the file isn't needed or already exists.
1025 is interrupted, it removes any partially made targets.
1026 This source prevents the target from being removed.
1028 Do not echo any of the commands associated with this target, exactly
1029 as if they all were preceded by an at sign
1032 Turn the target into
1035 When the target is used as a source for another target, the other target
1036 acquires the commands, sources, and attributes (except for
1040 If the target already has commands, the
1042 target's commands are appended
1047 source is appears in a dependency line, the sources that precede it are
1048 made before the sources that succeed it in the line.
1050 detected and targets that form loops will be silently ignored.
1052 .Sh "SPECIAL TARGETS"
1053 Special targets may not be included with other targets, i.e. they must be
1054 the only target specified.
1057 Any command lines attached to this target are executed before anything
1062 rule for any target (that was used only as a
1065 can't figure out any other way to create.
1066 Only the shell script is used.
1069 variable of a target that inherits
1072 to the target's own name.
1074 Any command lines attached to this target are executed after everything
1077 Mark each of the sources with the
1080 If no sources are specified, this is the equivalent of specifying the
1084 A list of suffixes that indicate files that can be included in a source
1086 The suffix must have already been declared with
1088 any suffix so declared will have the directories on its search path (see
1092 special variable, each preceded by a
1098 is interrupted, the commands for this target will be executed.
1100 This does for libraries what
1102 does for include files, except that the flag used is
1105 If no target is specified when
1107 is invoked, this target will be built.
1108 This is always set, either
1109 explicitly, or implicitly when
1111 selects the default target, to give the user a way to refer to the default
1112 target on the command line.
1114 This target provides a way to specify flags for
1116 when the makefile is used.
1117 The flags are as if typed to the shell, though the
1121 .\" XXX: NOT YET!!!!
1122 .\" .It Ic .NOTPARALLEL
1123 .\" The named targets are executed in non parallel mode. If no targets are
1124 .\" specified, then all targets are executed in non parallel mode.
1126 Disable parallel mode.
1128 Same as above, for compatibility with other pmake variants.
1130 The named targets are made in sequence.
1131 .\" XXX: NOT YET!!!!
1132 .\" .It Ic .PARALLEL
1133 .\" The named targets are executed in parallel mode. If no targets are
1134 .\" specified, then all targets are executed in parallel mode.
1136 The sources are directories which are to be searched for files not
1137 found in the current directory.
1138 If no sources are specified, any previously specified directories are
1140 Where possible, use of
1142 is preferred over use of the
1145 .It Ic .PATH\fIsuffix\fR
1146 The sources are directories which are to be searched for suffixed files
1147 not found in the current directory.
1151 first searches the suffixed search path, before reverting to the default
1152 path if the file is not found there.
1153 This form is required for
1161 attribute to any specified sources.
1162 Targets with this attribute are always
1163 considered to be out of date.
1167 attribute to any specified sources.
1168 If no sources are specified, the
1170 attribute is applied to every
1175 attribute to any specified sources.
1176 If no sources are specified, the
1178 attribute is applied to every
1179 command in the file.
1181 Each source specifies a suffix to
1183 If no sources are specified, any previous specified suffices are deleted.
1192 This was removed for POSIX compatibility.
1193 The internal variable
1195 is set to the same value as
1197 support for this may be removed in the future.
1199 Most of the more esoteric features of
1201 should probably be avoided for greater compatibility.
1205 utility uses the following environment variables, if they exist:
1210 .Ev MAKEOBJDIRPREFIX ,
1214 .Bl -tag -width /usr/share/doc/psd/12.make -compact
1216 list of dependencies
1218 list of dependencies
1220 list of dependencies
1224 system makefile (processed before any other file, including
1228 .It Pa /usr/share/mk
1229 system makefile directory
1230 .It /usr/share/doc/psd/12.make
1234 .Ev MAKEOBJDIRPREFIX
1238 The determination of
1240 is contorted to the point of absurdity.
1242 In the presence of several
1246 silently ignores all but the first.
1249 is not set to the default target when
1251 is invoked without a target name and no
1253 special target exists.
1257 in a test is very simple-minded.
1258 Currently, the only form that works is
1259 .Ql .if ${VAR} op something
1260 For instance, you should write tests as
1261 .Ql .if ${VAR} = "string"
1262 not the other way around, which doesn't work.
1264 For loops are expanded before tests, so a fragment such as:
1266 \&.for TMACHINE in ${SHARED_ARCHS}
1267 \&.if ${TMACHINE} = ${MACHINE}
1272 won't work, and should be rewritten the other way around.
1277 .%T "PMake - A Tutorial"
1280 .Pa /usr/share/doc/psd/12.make
projects / dragonfly.git / blob