diff options
Diffstat (limited to 'make.1')
| -rw-r--r-- | make.1 | 134 |
1 files changed, 72 insertions, 62 deletions
@@ -1,4 +1,4 @@ -.\" $NetBSD: make.1,v 1.282 2020/06/06 20:28:42 wiz Exp $ +.\" $NetBSD: make.1,v 1.289 2020/08/28 17:15:04 rillig Exp $ .\" .\" Copyright (c) 1990, 1993 .\" The Regents of the University of California. All rights reserved. @@ -29,7 +29,7 @@ .\" .\" from: @(#)make.1 8.4 (Berkeley) 3/19/94 .\" -.Dd June 5, 2020 +.Dd August 28, 2020 .Dt MAKE 1 .Os .Sh NAME @@ -166,8 +166,15 @@ Print the input graph after making everything, or before exiting on error. .It Ar "g3" Print the input graph before exiting on error. +.It Ar h +Print debugging information about hash table operations. .It Ar j Print debugging information about running multiple shells. +.It Ar L +Turn on lint checks. +This will throw errors for variable assignments that do not parse +correctly, at the time of assignment so the file and line number +are available. .It Ar l Print commands in Makefiles regardless of whether or not they are prefixed by .Ql @ @@ -311,7 +318,8 @@ as an argument). .It Fl n Display the commands that would have been executed, but do not actually execute them unless the target depends on the .MAKE special -source (see below). +source (see below) or the command is prefixed with +.Ql Ic + . .It Fl N Display the commands which would have been executed, but do not actually execute any of them; useful for debugging top-level makefiles @@ -412,37 +420,44 @@ or more sources. This creates a relationship where the targets .Dq 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 separates them. -The three operators are as follows: +and are customarily created from them. +A target is considered out-of-date if it does not exist, or if its +modification time is less than that of any of its sources. +An out-of-date target will be re-created, but not until all sources +have been examined and themselves re-created as needed. +Three operators may be used: .Bl -tag -width flag .It Ic \&: -A target is considered out-of-date if its modification time is less than -those of any of its sources.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 +Many dependency lines may name this target but only one may have +attached shell commands. +All sources named in all dependency lines are considered together, +and if needed the attached shell commands are run to create or +re-create the target. +If .Nm -is interrupted. +is interrupted, the target is removed. .It Ic \&! -Targets are always re-created, but not until all sources have been -examined and re-created as necessary. -Sources for a target accumulate over dependency lines when this operator -is used. -The target is removed if -.Nm -is interrupted. +The same, but the target is always re-created whether or not it is out +of date. .It Ic \&:: -If no sources are specified, the target is always re-created. -Otherwise, 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 +Any dependency line may have attached shell commands, but each one +is handled independently: its sources are considered and the attached +shell commands are run if the target is out of date with respect to +(only) those sources. +Thus, different groups of the attached shell commands may be run +depending on the circumstances. +Furthermore, unlike +.Ic \&:, +for dependency lines with no sources, the attached shell +commands are always run. +Also unlike +.Ic \&:, +the target will not be removed if .Nm is interrupted. .El +All dependency lines mentioning a particular target must use the same +operator. .Pp Targets and sources may contain the shell wildcard values .Ql \&? , @@ -608,7 +623,7 @@ This shorter form is not recommended. .Pp If the variable name contains a dollar, then the name itself is expanded first. This allows almost arbitrary variable names, however names containing dollar, -braces, parenthesis, or whitespace are really best avoided! +braces, parentheses, or whitespace are really best avoided! .Pp If the result of expanding a variable contains a dollar sign .Pq Ql \&$ @@ -1126,6 +1141,9 @@ is set to the value of for all programs which .Nm executes. +.It Ev .SHELL +The pathname of the shell used to run target scripts. +It is read-only. .It Ev .TARGETS The list of targets explicitly specified on the command line, if any. .It Ev VPATH @@ -1171,7 +1189,7 @@ Replaces each word in the variable with its suffix. .It Cm \&:H Replaces each word in the variable with everything but the last component. .It Cm \&:M Ns Ar pattern -Select only those words that match +Selects only those words that match .Ar pattern . The standard shell wildcard characters .Pf ( Ql * , @@ -1195,11 +1213,11 @@ This is identical to but selects all words which do not match .Ar pattern . .It Cm \&:O -Order every word in variable alphabetically. +Orders every word in variable alphabetically. .It Cm \&:Or -Order every word in variable in reverse alphabetical order. +Orders every word in variable in reverse alphabetical order. .It Cm \&:Ox -Randomize words in variable. +Shuffles the words in variable. The results will be different each time you are referring to the modified variable; use the assignment with expansion .Pq Ql Cm \&:= @@ -1249,7 +1267,7 @@ If a .Va utc value is not provided or is 0, the current time is used. .It Cm \&:hash -Compute a 32-bit hash of the value and encode it as hex digits. +Computes a 32-bit hash of the value and encode it as hex digits. .It Cm \&:localtime[=utc] The value is a format string for .Xr strftime 3 , @@ -1259,7 +1277,7 @@ If a .Va utc value is not provided or is 0, the current time is used. .It Cm \&:tA -Attempt to convert variable to an absolute path using +Attempts to convert variable to an absolute path using .Xr realpath 3 , if that fails, the value is unchanged. .It Cm \&:tl @@ -1271,7 +1289,7 @@ This modifier sets the separator to the character If .Ar c is omitted, then no separator is used. -The common escapes (including octal numeric codes), work as expected. +The common escapes (including octal numeric codes) work as expected. .It Cm \&:tu Converts variable to upper-case letters. .It Cm \&:tW @@ -1287,21 +1305,21 @@ See also .Sm off .It Cm \&:S No \&/ Ar old_string No \&/ Ar new_string No \&/ Op Cm 1gW .Sm on -Modify the first occurrence of +Modifies the first occurrence of .Ar old_string -in the variable's value, replacing it with +in each word of the variable's value, replacing it with .Ar new_string . If a .Ql g -is appended to the last slash of the pattern, all occurrences +is appended to the last delimiter of the pattern, all occurrences in each word are replaced. If a .Ql 1 -is appended to the last slash of the pattern, only the first word +is appended to the last delimiter of the pattern, only the first occurrence is affected. If a .Ql W -is appended to the last slash of the pattern, +is appended to the last delimiter of the pattern, then the value is treated as a single word (possibly containing embedded white space). If @@ -1370,13 +1388,6 @@ as occur in the word or words it is found in; the .Ql W modifier causes the value to be treated as a single word (possibly containing embedded white space). -Note that -.Ql 1 -and -.Ql g -are orthogonal; the former specifies whether multiple words are -potentially affected, the latter whether multiple substitutions can -potentially occur within each affected word. .Pp As for the .Cm \&:S @@ -1387,9 +1398,9 @@ and are subjected to variable expansion before being parsed as regular expressions. .It Cm \&:T -Replaces each word in the variable with its last component. +Replaces each word in the variable with its last path component. .It Cm \&:u -Remove adjacent duplicate words (like +Removes adjacent duplicate words (like .Xr uniq 1 ) . .Sm off .It Cm \&:\&? Ar true_string Cm \&: Ar false_string @@ -1405,7 +1416,7 @@ usually contain variable expansions. A common error is trying to use expressions like .Dl ${NUMBERS:M42:?match:no} which actually tests defined(NUMBERS), -to determine is any words match "42" you need to use something like: +to determine if any words match "42" you need to use something like: .Dl ${"${NUMBERS:M42}" != \&"\&":?match:no} . .It Ar :old_string=new_string This is the @@ -1449,7 +1460,7 @@ in either the or .Ar old_string , only the first instance is treated specially (as the pattern character); -all subsequent instances are treated as regular characters +all subsequent instances are treated as regular characters. .Pp Variable expansion occurs in the normal fashion inside both .Ar old_string @@ -1466,11 +1477,10 @@ This is the loop expansion mechanism from the OSF Development Environment (ODE) make. Unlike .Cm \&.for -loops expansion occurs at the time of -reference. -Assign +loops, expansion occurs at the time of reference. +Assigns .Ar temp -to each word in the variable and evaluate +to each word in the variable and evaluates .Ar string . The ODE convention is that .Ar temp @@ -1481,7 +1491,7 @@ For example. However a single character variable is often more readable: .Dl ${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'${.newline}@} .It Cm \&:_[=var] -Save the current variable value in +Saves the current variable value in .Ql $_ or the named .Va var @@ -1502,7 +1512,7 @@ is used to save the result of the modifier which is later referenced using the index values from .Ql :range . .It Cm \&:U Ns Ar newval -If the variable is undefined +If the variable is undefined, .Ar newval is the value. If the variable is defined, the existing value is returned. @@ -1512,7 +1522,7 @@ It is handy for setting per-target CFLAGS for instance: If a value is only required if the variable is undefined, use: .Dl ${VAR:D:Unewval} .It Cm \&:D Ns Ar newval -If the variable is defined +If the variable is defined, .Ar newval is the value. .It Cm \&:L @@ -1641,7 +1651,7 @@ Returns the number of words in the value. .El \" :[range] .El .Sh INCLUDE STATEMENTS, CONDITIONALS AND FOR LOOPS -Makefile inclusion, conditional structures and for loops reminiscent +Makefile inclusion, conditional structures and for loops reminiscent of the C programming language are provided in .Nm . All such structures are identified by a line beginning with a single @@ -1687,7 +1697,7 @@ The possible conditionals are as follows: The message is printed along with the name of the makefile and line number, then .Nm -will exit. +will exit immediately. .It Ic .export Ar variable ... Export the specified global variable. If no variable list is provided, all globals are exported @@ -1876,7 +1886,7 @@ 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 or an empty string in the case +variable is being compared against 0, or an empty string in the case of a string comparison. .Pp When @@ -1917,7 +1927,7 @@ The syntax of a for loop is: .Pp .Bl -tag -compact -width Ds .It Ic \&.for Ar variable Oo Ar variable ... Oc Ic in Ar expression -.It Aq make-rules +.It Aq make-lines .It Ic \&.endfor .El .Pp @@ -1929,7 +1939,7 @@ On each iteration of the loop, one word is taken and assigned to each in order, and these .Ic variables are substituted into the -.Ic make-rules +.Ic make-lines inside the body of the for loop. The number of words must come out even; that is, if there are three iteration variables, the number of words provided must be a multiple |