Intel XENIX 286 Programmers Guide (86) - Tenox.tc

make: Program Maintainer XENIX Programming
reads the dependency lines of the makefile named makeprog found in the current
directory. You can direct make to read dependency lines from the standard input by
giving "- " as the file name. make will read the standard input until end-of-file is
encountered.
You may use program options to modify the operation of the make program. The
following list describes some of the options:
-p Prints the complete set of macro definitions and dependency lines in a makefile.
-i Ignores errors returned by XENIX commands.
-k Abandons work on the current entry but continues on other branches that do not
depend on that entry.
-s Executes commands without displaying them.
-r Ignores the built-in rules.
-n Displays commands but does not execute them. make -n even displays lines
beginning with the at sign (@).
-e Ignores any macro definitions that attempt to assign new values to the shell's
environment variables.
-t Changes the modification date of each target file without recreating the files.
Note that make executes each command in the makefile by passing it to a separate
invocation of a shell. Because each command line is passed to a separate invocation of
the shell, care must be taken with certain commands (e.g., cd and shell control
commands) that have meaning only within a single shell process; the results are
forgotten before the next line is executed. If an error occurs, make norm ally stops the
command.
Using Pseudo-Target Names
It is often useful to include dependency lines that have pseudo-target names, i.e., names
for which no files actually exist or are produced. Pseudo-target names allow make to
perform tasks not directly connected with the creation of a program, such as deleting
old files or printing copies of source files. For example, the following dependency line
removes old copies of the given object files when the pseudo-target name "cleanup" is
given in the invocation of make.
cleanup :
rm x.o y.o z.o
Since no file exists for a given pseudo-target name, the target is always assumed to be
out of date. Thus the associated command is always executed.
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