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Manual

M4

NAME
SYNOPSIS
DESCRIPTION
Operation modes:
Preprocessor features:
Limits control:
Frozen state files:
Debugging:
FLAGS is any of:
AUTHOR
REPORTING BUGS
COPYRIGHT
SEE ALSO

NAME

m4 - macro processor

SYNOPSIS

m4 [ OPTION ]... [ FILE ]...

DESCRIPTION

Process macros in FILEs. If no FILE or if FILE is ‘-’, standard input is read.

Mandatory or optional arguments to long options are mandatory or optional for short options too.

Operation modes:

--help

display this help and exit

--version

output version information and exit

-E , --fatal-warnings

once: warnings become errors, twice: stop execution at first error

-i , --interactive

unbuffer output, ignore interrupts

-P , --prefix-builtins

force a ‘m4_’ prefix to all builtins

-Q , --quiet , --silent

suppress some warnings for builtins

--warn-macro-sequence [= REGEXP ]

warn if macro definition matches REGEXP,

default \$${[ˆ}]*}\|[0-9][0-9]+$

-W , --word-regexp = REGEXP

use REGEXP for macro name syntax

Preprocessor features:

-D , --define=NAME [= VALUE ]

define NAME as having VALUE, or empty

-I , --include = DIRECTORY

append DIRECTORY to include path

-s , --synclines

generate ‘#line NUM "FILE"’ lines

-U , --undefine = NAME

undefine NAME

Limits control:

-g , --gnu

override -G to re-enable GNU extensions

-G , --traditional

suppress all GNU extensions

-H , --hashsize = PRIME

set symbol lookup hash table size [509]

-L , --nesting-limit = NUMBER

change nesting limit, 0 for unlimited [0]

Frozen state files:

-F , --freeze-state = FILE

produce a frozen state on FILE at end

-R , --reload-state = FILE

reload a frozen state from FILE at start

Debugging:

-d , --debug [= FLAGS ]

set debug level (no FLAGS implies ‘aeq’)

--debugfile [= FILE ]

redirect debug and trace output to FILE (default stderr, discard if empty string)

-l , --arglength = NUM

restrict macro tracing size

-t , --trace = NAME

trace NAME when it is defined

FLAGS is any of:

	a		show actual arguments
	c		show before collect, after collect and after call
	e		show expansion
	f		say current input file name
	i		show changes in input files
	l		say current input line number
	p		show results of path searches
	q		quote values as necessary, with a or e flag
	t		trace for all macro calls, not only traceon’ed
	x		add a unique macro call id, useful with c flag
	V		shorthand for all of the above flags

If defined, the environment variable ‘M4PATH’ is a colon-separated list of directories included after any specified by ‘-I’.

Exit status is 0 for success, 1 for failure, 63 for frozen file version mismatch, or whatever value was passed to the m4exit macro.

AUTHOR

Written by Rene’ Seindal.

REPORTING BUGS

Report bugs to: bug-m4@gnu.org
GNU M4 home page: <https://www.gnu.org/software/m4/>
General help using GNU software: <https://www.gnu.org/gethelp/>

COPYRIGHT

Copyright © 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.