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gccmakedep(1)									    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, other-
       wise 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 understand, 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 replacing 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.

       -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 unrec-
	      ognized  arguments  following  it will be silently ignored.  A second double hyphen
	      terminates this special treatment.  In this way, gccmakedep 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
       The  version  of  the  gccmakedep included in this X.Org Foundation release was originally
       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 makedepend(1).

X Version 11				 gccmakedep 1.0.2			    gccmakedep(1)
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