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gccmakedep(1)		    General Commands Manual		 gccmakedep(1)

       gccmakedep - create dependencies	in makefiles using 'gcc	-M'

       gccmakedep  [  -sseparator  ]  [	 -fmakefile ] [	-a ] [ -- options -- ]
       sourcefile ...

       The gccmakedep program calls 'gcc -M' to	output makefile	rules describ-
       ing  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	begin-
       ning with


       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.

       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
		   gccmakedep -- $(CFLAGS) -- $(SRCS)

       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

       -a     Append the dependencies to the file instead of replacing	exist-
	      ing dependencies.

	      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 in-
	      stead of modifying an existing file.

	      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	 following  it will be
	      silently ignored.	 A second double hyphen	terminates  this  spe-
	      cial  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.

       gcc(1), make(1),	makedepend(1).

       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 1.0.3			 gccmakedep(1)


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