PWB1/usr/man/man1/make.1

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.th MAKE I 5/31/77
.sh NAME
make \*- make a program
.sh SYNOPSIS
.bd make
[\c
.bd \*-f
descfile\c
] [\c
.bd \*-p\c
] [\c
.bd \*-i\c
] [\c
.bd \*-s\c
] [\c
.bd \*-r\c
] [\c
.bd \*-n\c
] [\c
.bd \*-t\c
] file ...
.sh DESCRIPTION
.it Make
may be used to mechanize program creation and maintenance,
while ensuring that all constituents are current.
A graph of dependencies is specified in the
.it descfile(s).
The standard input will be read if
.bd \*-
is given for
.it descfile.
If no
.bd \*-f
options are present,
the file named
.bd makefile
or, if absent, the file named
.bd Makefile
in the current directory is used.
The
.bd \*-p
option prints out a version of that graph.
Each file name argument is `made', as described below.
If no such arguments are present, the initial node in the description file is made.
.s3
The
.it descfile
consists of a sequence of entries that describe the
prerequisites and operations for creating an object (usually a file).
The first line of each entry contains the
names of the objects to be made, followed by a colon, optionally followed by a list of other files that must
be available and current in order to remake it.
Text following a semicolon on the first line, and all immediately following lines
that begin with a tab,
are fed to the Shell to make the object.
Each line is fed to a separate instance of the Shell.
All text following a sharp is taken to be a comment.
For example:
.s3
.in +5n
.nf
pgm: x.o y.o ; cc x.o y.o -lp
	mv a.out pgm     # command to be done
x.o: dcls
.fi
.in -5n
.s3
.it Make
walks the graph of dependencies.
If a needed object depends on another that is not present or is younger than itself, it is remade.
If an object's name ends in `\fB.\fPo', the description file, and then the current directory,
are searched for a corresponding name ending in `\fB.\fPr', `\fB.\fPf', `\fB.\fPc', `\fB.\fPs',
`\fB.\fPl' (Lex), `\fB.\fPy' (Yacc-C).
(These default rules are not applied if the
.bd \*-r
option is specified).
If such a file is found and is younger than the object, a compilation command is executed.
In the example above,
if `dcls' has been changed since `pgm' was last made, `x.c' will be recompiled
and `pgm' will be reloaded.
.s3
Each command line is printed before it is executed
unless the
.bd \*-s
option is specified on the command line or the special name `\fB.\fPSILENT'
appears in the description.
The command lines are printed but not executed if the
.bd \*-n
option is specified.
The date last modified is updated but the commands given are not executed for each file if the
.bd \*-t
option is specified.
(This option is useful when a source change is known to be incremental or benign).
.s3
.it Make
examines the
.it exit\^\c
(II) status returned by each executed command.
If the status is non-zero
(i.e., if an error occurred),
.it make
aborts, unless either
(a) the
.bd \*-i
option was specified,
or (b) the command name in the
.it descfile
was prefixed by `\*-'.
.sh "SEE ALSO"
.it "Make \- A Program for Maintaining Computer Programs"
by S. I. Feldman.
.sh DIAGNOSTICS
No description file argument
.br
Cannot find description file
.br
Syntax error
.br
Don\*at know how to make xxx.
.sh BUGS
Many UNIX commands return random status, which will cause
.it make
to
assume that the command failed.
In case of trouble, use the
.bd \*-i
option or a minus sign on the command line.