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


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


       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.


       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
              existing 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
              instead 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
              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.


       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).