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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
70 that can be found in either the current directory or a special object directory
73 will be read for this list of specifications.
76 can be found, it is also read (see
79 This manual page is intended as a reference document only.
80 For a more thorough introduction to
82 and makefiles, please refer to
83 .%T "Make \- A Tutorial" .
85 The options are as follows:
88 Make archive errors non-fatal, causing make just to skip the remainder
89 or all of the archive and continue after printing a message.
91 Try to be backwards compatible by executing a single shell per command and
92 by executing the commands to make the sources of a dependency line in sequence.
93 This is turned on by default unless
99 before reading the makefiles or doing anything else.
102 options are specified, each is interpreted relative to the previous one:
103 .Fl C Pa / Fl C Pa etc
109 to be 1, in the global context.
111 Turn on debugging, and specify which portions of
113 are to print debugging information.
116 is one or more of the following:
119 Print all possible debugging information;
120 equivalent to specifying all of the debugging flags.
122 Print debugging information about archive searching and caching.
124 Print debugging information about conditional evaluation.
126 Print debugging information about directory searching and caching.
128 Print debugging information about the execution of for loops.
130 Print the input graph before making anything.
132 Print the input graph after making everything, or before exiting
135 Print debugging information about running multiple shells.
137 Print commands in Makefiles regardless of whether or not they are prefixed
138 by @ or other "quiet" flags.
139 Also known as "loud" behavior.
141 Print debugging information about making targets, including modification
144 Print debugging information about suffix-transformation rules.
146 Print debugging information about target list maintenance.
148 Print debugging information about variable assignment.
151 Specify a variable whose environment value (if any) will override
152 macro assignments within makefiles.
154 Specify that environment values override macro assignments within
155 makefiles for all variables.
157 Specify a makefile to read instead of the default
165 standard input is read.
166 Multiple makefiles may be specified, and are read in the order specified.
167 .It Fl I Ar directory
168 Specify a directory in which to search for makefiles and included makefiles.
169 The system makefile directory (or directories, see the
171 option) is automatically included as part of this list.
173 Ignore non-zero exit of shell commands in the makefile.
174 Equivalent to specifying
176 before each command line in the makefile.
178 Specify the maximum number of jobs that
180 may have running at any one time.
181 Turns compatibility mode off, unless the
183 flag is also specified.
185 Continue processing after errors are encountered, but only on those targets
186 that do not depend on the target whose creation caused the error.
187 .It Fl m Ar directory
188 Specify a directory in which to search for
190 and makefiles included via the <...> style.
191 Multiple directories can be added to form a search path.
192 This path will override the default system include path:
194 Furthermore, the system include path will be appended to the search path used
195 for "..."-style inclusions (see the
199 Display the commands that would have been executed, but do not actually
202 Collate the output of a given job and display it only when the job finishes,
203 instead of mixing the output of parallel jobs together.
204 This option has no effect unless
208 Do not execute any commands, but exit 0 if the specified targets are
209 up-to-date and 1, otherwise.
211 Do not use the built-in rules specified in the system makefile.
213 Stop processing when an error is encountered.
215 This is needed to negate the
217 option during recursive builds.
219 Do not echo any commands as they are executed.
220 Equivalent to specifying
222 before each command line in the makefile.
224 Rather than re-building a target as specified in the makefile, create it
225 or update its modification time to make it appear up-to-date.
231 in the global context.
232 Do not build any targets.
233 Multiple instances of this option may be specified;
234 the variables will be printed one per line,
235 with a blank line for each null or undefined variable.
238 For multi-job makes, this will cause file banners to be generated.
242 option to print the values of variables,
243 do not recursively expand the values.
244 .It Ar variable Ns No = Ns Ar value
245 Set the value of the variable
251 There are seven different types of lines in a makefile: file dependency
252 specifications, shell commands, variable assignments, include statements,
253 conditional directives, for loops, and comments.
255 In general, lines may be continued from one line to the next by ending
256 them with a backslash
258 The trailing newline character and initial whitespace on the following
259 line are compressed into a single space.
260 .Sh FILE DEPENDENCY SPECIFICATIONS
261 Dependency lines consist of one or more targets, an operator, and zero
263 This creates a relationship where the targets
266 and are usually created from them.
267 The exact relationship between the target and the source is determined
268 by the operator that separates them.
269 The three operators are as follows:
272 A target is considered out-of-date if its modification time is less than
273 those of any of its sources.
274 Sources for a target accumulate over dependency lines when this operator
276 The target is removed if
280 Targets are always re-created, but not until all sources have been
281 examined and re-created as necessary.
282 Sources for a target accumulate over dependency lines when this operator
284 The target is removed if
288 If no sources are specified, the target is always re-created.
289 Otherwise, a target is considered out-of-date if any of its sources has
290 been modified more recently than the target.
291 Sources for a target do not accumulate over dependency lines when this
293 The target will not be removed if
298 Targets and sources may contain the shell wildcard expressions
309 may only be used as part of the final
310 component of the target or source, and must be used to describe existing
314 need not necessarily be used to describe existing files.
315 Expansion is in directory order, not alphabetically as done in the shell.
317 Each target may have associated with it a series of shell commands, normally
318 used to create the target.
319 Each of the commands in this script
321 be preceded by a tab.
322 While any target may appear on a dependency line, only one of these
323 dependencies may be followed by a creation script, unless the
327 If the first characters of the command line are
332 the command is treated specially.
335 causes the command not to be echoed before it is executed.
338 causes any non-zero exit status of the command line to be ignored.
341 causes the command to be executed even if
343 is specified on the command line.
344 .Sh VARIABLE ASSIGNMENTS
347 are much like variables in the shell, and, by tradition,
348 consist of all upper-case letters.
349 The five operators that can be used to assign values to variables are as
353 Assign the value to the variable.
354 Any previous value is overridden.
356 Append the value to the current value of the variable.
358 Assign the value to the variable if it is not already defined.
360 Assign with expansion, i.e., expand the value before assigning it
362 Normally, expansion is not done until the variable is referenced.
364 Expand the value and pass it to the shell for execution and assign
365 the result to the variable.
366 Any newlines in the result are replaced with spaces.
369 Any whitespace before the assigned
371 is removed; if the value is being appended, a single space is inserted
372 between the previous contents of the variable and the appended value.
374 Variables are expanded by surrounding the variable name with either
379 and preceding it with
382 If the variable name contains only a single letter, the surrounding
383 braces or parentheses are not required.
384 This shorter form is not recommended.
386 Variable substitution occurs at two distinct times, depending on where
387 the variable is being used.
388 Variables in dependency lines are expanded as the line is read.
389 Variables in shell commands are expanded when the shell command is
392 The four different classes of variables (in order of increasing precedence)
395 .It Environment variables
396 Variables defined as part of
400 Variables defined in the makefile or in included makefiles.
401 .It Command line variables
402 Variables defined as part of the command line and variables
405 environment variable or the
409 Variables that are defined specific to a certain target.
410 The seven local variables are as follows:
411 .Bl -tag -width ".ARCHIVE"
413 The list of all sources for this target; also known as
416 The name of the archive file; also known as
419 The name/path of the source from which the target is to be transformed
422 source); also known as
425 The name of the archive member; also known as
428 The list of sources for this target that were deemed out-of-date; also
432 The file prefix of the file, containing only the file portion, no suffix
433 or preceding directory components; also known as
436 The name of the target; also known as
449 are permitted for backward
450 compatibility and are not recommended.
460 permitted for compatibility with
462 makefiles and are not recommended.
464 Four of the local variables may be used in sources on dependency lines
465 because they expand to the proper value for each target on the line.
476 sets or knows about the following internal variables or environment
478 .Bl -tag -width ".Va .MAKEFILE_LIST"
484 expands to a single dollar
490 .Pq Va argv Ns Op 0 .
492 A path to the directory where
499 to the canonical path given by
502 A path to the directory where the targets are built.
505 searches for an alternate directory to place target files.
506 It will attempt to change into this special directory
507 and will search this directory for makefiles
508 not found in the current directory.
509 The following directories are tried in order:
513 ${MAKEOBJDIRPREFIX}/`pwd`
524 The first directory that
526 successfully changes into is used.
531 is set in the environment but
533 is unable to change into the corresponding directory,
534 then the current directory is used
535 without checking the remainder of the list.
536 If they are undefined and
538 is unable to change into any of the remaining three directories,
539 then the current directory is used.
544 must be environment variables and should not be set on
552 to the canonical path given by
554 .It Va .MAKEFILE_LIST
557 reads various makefiles, including the default files and any
558 obtained from the command line and
560 directives, their names will be automatically appended to the
563 They are added right before
565 begins to parse them, so that the name of the current makefile is the
566 last word in this variable.
568 The environment variable
570 may contain anything that
574 Its contents are stored in
578 All options and variable assignments specified on
580 command line are appended to the
582 variable which is then
583 entered into the environment as
585 for all programs which
588 By modifying the contents of the
590 variable, makefile can alter the contents of the
592 environment variable made available for all programs which
594 executes; compare with the
596 special target below.
598 When passing macro definitions and flag arguments in the
600 environment variable,
601 space and tab characters are quoted by preceding them with a backslash.
604 variable from the environment,
605 all sequences of a backslash and one of space or tab
606 are replaced just with their second character
607 without causing a word break.
608 Any other occurences of a backslash are retained.
609 Groups of unquoted space, tab and newline characters cause word
612 This variable is provided for backward compatibility and
613 contains all the options from the
615 environment variable plus any options specified on
621 is currently building.
631 Name of the machine architecture
633 is running on, obtained from the
635 environment variable, or through
639 Name of the machine architecture
641 was compiled for, defined at compilation time.
643 Makefiles may assign a colon-delimited list of directories to
645 These directories will be searched for source files by
647 after it has finished parsing all input makefiles.
650 Variable expansion may be modified to select or modify each word of the
653 is whitespace-delimited sequence of characters).
654 The general format of a variable expansion is as follows:
656 .Dl {variable[:modifier[:...]]}
658 Each modifier begins with a colon and one of the following
660 The colon may be escaped with a backslash
664 .It Cm C No \&/ Ar pattern Xo
665 .No \&/ Ar replacement
669 Modify each word of the value,
670 substituting every match of the extended regular expression
678 Normally, the first occurrence of the pattern in
679 each word of the value is changed.
682 modifier causes the substitution to apply to at most one word; the
684 modifier causes the substitution to apply to as many instances of the
685 search pattern as occur in the word or words it is found in.
690 are orthogonal; the former specifies whether multiple words are
691 potentially affected, the latter whether multiple substitutions can
692 potentially occur within each affected word.
694 Replaces each word in the variable with its suffix.
696 Replaces each word in the variable with everything but the last component.
698 Converts variable to lower-case letters.
699 .It Cm M Ns Ar pattern
700 Select only those words that match the rest of the modifier.
701 The standard shell wildcard characters
708 The wildcard characters may be escaped with a backslash
710 .It Cm N Ns Ar pattern
713 but selects all words which do not match
714 the rest of the modifier.
716 Order every word in the variable alphabetically.
718 Quotes every shell meta-character in the variable, so that it can be passed
719 safely through recursive invocations of
722 Replaces each word in the variable with everything but its suffix.
724 .It Cm S No \&/ Ar old_string Xo
725 .No \&/ Ar new_string
729 Modify the first occurrence of
731 in each word of the variable's value, replacing it with
735 is appended to the last slash of the pattern, all occurrences
736 in each word are replaced.
742 is anchored at the beginning of each word.
745 ends with a dollar sign
747 it is anchored at the end of each word.
754 Any character may be used as a delimiter for the parts of the modifier
756 The anchoring, ampersand, and delimiter characters may be escaped with a
760 Variable expansion occurs in the normal fashion inside both
764 with the single exception that a backslash is used to prevent the expansion
767 not a preceding dollar sign as is usual.
768 .It Ar old_string=new_string
771 style variable substitution.
772 It must be the last modifier specified.
777 do not contain the pattern matching character
779 then it is assumed that they are
780 anchored at the end of each word, so only suffixes or entire
781 words may be replaced.
789 Replaces each word in the variable with its last component.
791 Converts variable to upper-case letters.
793 .Sh DIRECTIVES, CONDITIONALS, AND FOR LOOPS
794 Directives, conditionals, and for loops reminiscent
795 of the C programming language are provided in
797 All such structures are identified by a line beginning with a single
801 The following directives are supported:
803 .It Ic \&.include Ar <file>
804 .It Ic \&.include Ar \*qfile\*q
805 Include the specified makefile.
806 Variables between the angle brackets
807 or double quotes are expanded to form the file name.
809 are used, the included makefile is expected to be in the system
811 If double quotes are used, the including
812 makefile's directory and any directories specified using the
814 option are searched before the system
816 .It Ic .undef Ar variable
817 Un-define the specified global variable.
818 Only global variables may be un-defined.
819 .It Ic \&.makeenv Ar variable
820 Set the environment flag for a preexisting global variable. The current
821 and future contents of the variable will be exported to the environment.
822 .It Ic .error Ar message
823 Terminate processing of the makefile immediately.
825 makefile, the line on which the error was encountered and the specified
826 message are printed to the standard error output and
828 terminates with exit code 1.
829 Variables in the message are expanded.
830 .It Ic .warning Ar message
831 Emit a warning message.
832 The filename of the makefile,
833 the line on which the warning was encountered,
834 and the specified message are printed to the standard error output.
835 Variables in the message are expanded.
838 Conditionals are used to determine which parts of the Makefile
840 They are used similarly to the conditionals supported
841 by the C pre-processor.
842 The following conditionals are supported:
846 .Oo \&! Oc Ns Ar expression
847 .Op Ar operator expression ...
849 Test the value of an expression.
852 .Oo \&! Oc Ns Ar variable
853 .Op Ar operator variable ...
855 Test the value of a variable.
858 .Oo \&! Oc Ns Ar variable
859 .Op Ar operator variable ...
861 Test the value of a variable.
864 .Oo \&! Oc Ns Ar target
865 .Op Ar operator target ...
867 Test the target being built.
870 .Oo \&! Oc Ns Ar target
871 .Op Ar operator target ...
873 Test the target being built.
875 Reverse the sense of the last conditional.
878 .Oo \&! Oc Ns Ar expression
879 .Op Ar operator expression ...
887 .Oo \&! Oc Ns Ar variable
888 .Op Ar operator variable ...
896 .Oo \&! Oc Ns Ar variable
897 .Op Ar operator variable ...
905 .Oo \&! Oc Ns Ar target
906 .Op Ar operator target ...
914 .Oo \&! Oc Ns Ar target
915 .Op Ar operator target ...
922 End the body of the conditional.
927 may be any one of the following:
928 .Bl -tag -width "Cm XX"
935 of higher precedence than
941 will only evaluate a conditional as far as is necessary to determine
943 Parentheses may be used to change the order of evaluation.
946 may be used to logically negate an entire
948 It is of higher precedence than
953 may be any of the following:
956 Takes a variable name as an argument and evaluates to true if the variable
959 Takes a target name as an argument and evaluates to true if the target
960 was specified as part of
962 command line or was declared the default target (either implicitly or
965 before the line containing the conditional.
967 Takes a variable, with possible modifiers, and evaluates to true if
968 the expansion of the variable would result in an empty string.
970 Takes a file name as an argument and evaluates to true if the file exists.
971 The file is searched for on the system search path (see
974 Takes a target name as an argument and evaluates to true if the target
980 may also be an arithmetic or string comparison, with the left-hand side
981 being a variable expansion.
982 Variable expansion is
983 performed on both sides of the comparison, after which the integral
985 A value is interpreted as hexadecimal if it is
986 preceded by 0x, otherwise it is decimal; octal numbers are not supported.
987 The standard C relational operators are all supported.
989 variable expansion, either the left or right hand side of a
993 operator is not an integral value, then
994 string comparison is performed between the expanded
996 If no relational operator is given, it is assumed that the expanded
997 variable is being compared against 0.
1001 is evaluating one of these conditional expressions, and it encounters
1002 a word it does not recognize, either the
1006 expression is applied to it, depending on the form of the conditional.
1014 expression is applied.
1015 Similarly, if the form is
1021 expression is applied.
1023 If the conditional evaluates to true the parsing of the makefile continues
1025 If it evaluates to false, the following lines are skipped.
1026 In both cases this continues until a
1032 For loops are typically used to apply a set of rules to a list of files.
1033 The syntax of a for loop is:
1035 .Bl -tag -width indent -compact
1036 .It Ic .for Ar variable Ic in Ar expression
1043 is evaluated, it is split into words.
1047 is successively set to each word, and substituted in the
1049 inside the body of the for loop.
1051 Comments begin with a hash
1053 character, anywhere but in a shell
1054 command line, and continue to the end of the line.
1058 Ignore any errors from the commands associated with this target, exactly
1059 as if they all were preceded by a dash
1062 Execute the commands associated with this target even if the
1066 options were specified.
1067 Normally used to mark recursive
1072 selects the first target it encounters as the default target to be built
1073 if no target was specified.
1074 This source prevents this target from being selected.
1076 If a target is marked with this attribute and
1078 cannot figure out how to create it, it will ignore this fact and assume
1079 the file is not needed or already exists.
1083 is interrupted, it removes any partially made targets.
1084 This source prevents the target from being removed.
1086 Do not echo any of the commands associated with this target, exactly
1087 as if they all were preceded by an at sign
1090 Turn the target into
1093 When the target is used as a source for another target, the other target
1094 acquires the commands, sources, and attributes (except for
1098 If the target already has commands, the
1100 target's commands are appended
1105 source is appears in a dependency line, the sources that precede it are
1106 made before the sources that succeed it in the line.
1108 detected and targets that form loops will be silently ignored.
1110 .Sh "SPECIAL TARGETS"
1111 Special targets may not be included with other targets, i.e., they must be
1112 the only target specified.
1115 Any command lines attached to this target are executed before anything
1120 rule for any target (that was used only as a
1123 cannot figure out any other way to create.
1124 Only the shell script is used.
1127 variable of a target that inherits
1130 to the target's own name.
1132 Any command lines attached to this target are executed after everything
1135 Mark each of the sources with the
1138 If no sources are specified, this is the equivalent of specifying the
1142 A list of suffixes that indicate files that can be included in a source
1144 The suffix must have already been declared with
1146 any suffix so declared will have the directories on its search path (see
1150 special variable, each preceded by a
1156 is interrupted, the commands for this target will be executed.
1158 This does for libraries what
1160 does for include files, except that the flag used is
1163 If no target is specified when
1165 is invoked, this target will be built.
1166 This is always set, either
1167 explicitly, or implicitly when
1169 selects the default target, to give the user a way to refer to the default
1170 target on the command line.
1172 This target provides a way to specify flags for
1174 when the makefile is used.
1175 The flags are as if typed to the shell, though the
1181 and variable assignments specified as the source
1182 for this target are also appended to the
1185 Please note the difference between this target and the
1187 internal variable: specifying an option or variable
1188 assignment as the source for this target will affect
1190 the current makefile and all processes that
1194 Same as above, for backward compatibility.
1195 .\" XXX: NOT YET!!!!
1196 .\" .It Ic .NOTPARALLEL
1197 .\" The named targets are executed in non parallel mode. If no targets are
1198 .\" specified, then all targets are executed in non parallel mode.
1200 Disable parallel mode.
1202 Same as above, for compatibility with other
1206 The named targets are made in sequence.
1207 .\" XXX: NOT YET!!!!
1208 .\" .It Ic .PARALLEL
1209 .\" The named targets are executed in parallel mode. If no targets are
1210 .\" specified, then all targets are executed in parallel mode.
1212 The sources are directories which are to be searched for files not
1213 found in the current directory.
1214 If no sources are specified, any previously specified directories are
1216 Where possible, use of
1218 is preferred over use of the
1221 .It Ic .PATH\fIsuffix\fR
1222 The sources are directories which are to be searched for suffixed files
1223 not found in the current directory.
1227 first searches the suffixed search path, before reverting to the default
1228 path if the file is not found there.
1229 This form is required for
1237 attribute to any specified sources.
1238 Targets with this attribute are always
1239 considered to be out of date.
1243 attribute to any specified sources.
1244 If no sources are specified, the
1246 attribute is applied to every
1249 Select another shell.
1250 The sources of this target have the format
1251 .Ar key Ns = Ns Ar value .
1255 .Bl -tag -width ".Va hasErrCtl"
1257 Specify the path to the new shell.
1259 Specify the name of the new shell.
1260 This may be either one of the three builtin shells (see below) or any
1263 Specify the shell command to turn echoing off.
1265 Specify the shell command to turn echoing on.
1267 Usually shells print the echo off command before turning echoing off.
1268 This is the exact string that will be printed by the shell and is used
1269 to filter the shell output to remove the echo off command.
1271 The shell option that turns echoing on.
1273 The shell option to turn on error checking.
1274 If error checking is on, the shell should exit if a command returns
1277 True if the shell has error control.
1281 is true then this is the shell command to turn error checking on.
1284 is false then this is a command template to echo commands for which error
1285 checking is disabled.
1286 The template must contain a
1291 is true, this is the shell command to turn error checking off.
1294 is false, this is a command template to execute a command so that errors
1296 The template must contain a
1300 Values that are strings must be surrounded by double quotes.
1301 Boolean values are specified as
1305 (in either case) to mean true.
1306 Any other value is taken to mean false.
1308 There are several uses of the
1313 Selecting one of the builtin shells.
1314 This is done by just specifying the name of the shell with the
1317 It is also possible to modify the parameters of the builtin shell by just
1318 specifying other keywords (except for
1321 Using another executable for one of the builtin shells.
1322 This is done by specifying the path to the executable with the
1325 If the last component is the same as the name of the builtin shell, no
1326 name needs to be specified; if it is different, the name must be given:
1327 .Bd -literal -offset indent
1328 \&.SHELL: path="/usr/local/bin/sh"
1331 selects the builtin shell
1333 but will execute it from
1334 .Pa /usr/local/bin/sh .
1335 Like in the previous case, it is possible to modify parameters of the builtin
1336 shell by just specifying them.
1338 Using an entirely different shell.
1339 This is done by specifying all keywords.
1342 The builtin shells are
1353 it is unwise to specify
1354 .Va name Ns = Ns Qq Li ksh
1355 without also specifying a path.
1359 attribute to any specified sources.
1360 If no sources are specified, the
1362 attribute is applied to every
1363 command in the file.
1365 Each source specifies a suffix to
1367 If no sources are specified, any previous specified suffices are deleted.
1372 utility uses the following environment variables, if they exist:
1378 .Ev MAKEOBJDIRPREFIX .
1380 .Bl -tag -width /usr/share/doc/psd/12.make -compact
1382 list of dependencies
1384 list of dependencies
1386 list of dependencies
1390 system makefile (processed before any other file, including
1394 .It Pa /usr/share/mk
1395 system makefile directory
1396 .It /usr/share/doc/psd/12.make
1400 .Ev MAKEOBJDIRPREFIX
1404 List all included makefiles in order visited:
1406 .Dl "make -V .MAKEFILE_LIST | tr \e\ \e\en"
1414 This was removed for POSIX compatibility.
1415 The internal variable
1417 is set to the same value as
1419 support for this may be removed in the future.
1421 Most of the more esoteric features of
1423 should probably be avoided for greater compatibility.
1428 .%T "PMake - A Tutorial"
1431 .Pa /usr/share/doc/psd/12.make
1435 command appeared in PWB UNIX.
1437 The determination of
1439 is contorted to the point of absurdity.
1441 In the presence of several
1445 silently ignores all but the first.
1448 is not set to the default target when
1450 is invoked without a target name and no
1452 special target exists.
1456 in a test is very simple-minded.
1457 Currently, the only form that works is
1458 .Ql .if ${VAR} op something
1459 For instance, you should write tests as
1460 .Ql .if ${VAR} == "string"
1461 not the other way around, which would give you an error.
1463 For loops are expanded before tests, so a fragment such as:
1464 .Bd -literal -offset indent
1465 \&.for ARCH in ${SHARED_ARCHS}
1466 \&.if ${ARCH} == ${MACHINE}
1472 will not work, and should be rewritten as:
1473 .Bd -literal -offset indent
1474 \&.for ARCH in ${SHARED_ARCHS}
1475 \&.if ${MACHINE} == ${ARCH}
1481 The parsing code is broken with respect to handling a semicolon
1482 after a colon, so a fragment like this will fail:
1483 .Bd -literal -offset indent
1487 \&.for h in ${HDRS:S;^;${.CURDIR}/;}
1492 A trailing backslash in a variable value defined on the command line causes
1493 the delimiting space in the
1495 environment variable to be preceeded by that backslash.
1496 That causes a submake to not treat that space as a word delimiter.
1497 Fixing this requires a larger rewrite of the code handling command line
1498 macros and assignments to