20.2. Command-Line Syntax
make [options] [targets] [macro definitions]
Options, targets, and macro definitions can appear in any order.
Macro definitions are typed as:
name=string
If no makefile or
Makefile
exists, make will attempt to
extract the most recent version of one from an SCCS file, if one exists.
(Some versions also know about RCS.)
20.2.1. Options
- -e
- Environment variables override any macros defined in description files.
- -f file
- Use file as the description file; a filename
of - denotes standard input.
-f can be used more than once to concatenate
multiple description files.
With no -f option, make first
looks for a file named makefile,
and then one named Makefile.
- -i
- Ignore error codes from commands (same as .IGNORE).
- -k
- Abandon the current target when it fails, but keep working with
unrelated targets.
- -n
- Print commands but don't execute (used for testing).
-n prints commands even if they
begin with @ in the description file.
Lines that begin with $(MAKE) are an
exception.
Such lines are executed. However, since the
-n is passed to the subsequent make
in the MAKEFLAGS environment variable, that make
also just prints the commands it executes.
This allows you to test out all the makefile
files in a whole software hierarchy without actually doing anything.
- -p
- Print macro definitions, suffixes, and target descriptions.
- -q
- Query; return 0 if file is up to date; nonzero otherwise.
- -r
- Do not use the default rules.
- -s
- Do not display command
lines (same as .SILENT).
- -t
- Touch the target files, causing them to be updated.
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