gccmakedep(1) UNIX Programmer's Manual gccmakedep(1)
NAME
gccmakedep - create dependencies in makefiles using 'gcc -M'
SYNOPSIS
gccmakedep [ -sseparator ] [ -fmakefile ] [ -a ] [ --
options -- ] sourcefile ...
DESCRIPTION
The gccmakedep program calls 'gcc -M' to output makefile
rules describing the dependencies of each sourcefile, so
that make(1) knows which object files must be recompiled
when a dependency has changed.
By default, gccmakedep places its output in the file named
makefile if it exists, otherwise Makefile. An alternate
makefile may be specified with the -f option. It first
searches the makefile for a line beginning with
# DO NOT DELETE
or one provided with the -s option, as a delimiter for the
dependency output. If it finds it, it will delete everything
following this up to the end of the makefile and put the
output after this line. If it doesn't find it, the program
will append the string to the makefile and place the output
after that.
EXAMPLE
Normally, gccmakedep will be used in a makefile target so
that typing 'make depend' will bring the dependencies up to
date for the makefile. For example,
SRCS = file1.c file2.c ...
CFLAGS = -O -DHACK -I../foobar -xyz
depend:
gccmakedep -- $(CFLAGS) -- $(SRCS)
OPTIONS
The program will ignore any option that it does not under-
stand, so you may use the same arguments that you would for
gcc(1), including -D and -U options to define and undefine
symbols and -I to set the include path.
-a Append the dependencies to the file instead of replac-
ing existing dependencies.
-fmakefile
Filename. This allows you to specify an alternate
makefile in which gccmakedep can place its output.
Specifying - as the file name (that is, -f-) sends the
output to standard output instead of modifying an
existing file.
XFree86 Version 4.5.0 1
gccmakedep(1) UNIX Programmer's Manual gccmakedep(1)
-sstring
Starting string delimiter. This option permits you to
specify a different string for gccmakedep to look for
in the makefile. The default is # DO NOT DELETE.
-- options --
If gccmakedep encounters a double hyphen (--) in the
argument list, then any unrecognized arguments follow-
ing it will be silently ignored. A second double hyphen
terminates this special treatment. In this way, gccmak-
edep can be made to safely ignore esoteric compiler
arguments that might normally be found in a CFLAGS make
macro (see the EXAMPLE section above). -D, -I, and -U
options appearing between the pair of double hyphens
are still processed normally.
SEE ALSO
gcc(1), make(1), makedepend(1).
AUTHOR
gccmakedep was written by the XFree86 Project based on code
supplied by Hongjiu Lu.
Colin Watson wrote this manual page, originally for the
Debian Project, based partly on the manual page for mak-
edepend(1).
XFree86 Version 4.5.0 2