1MAKEDEPEND(1)               General Commands Manual              MAKEDEPEND(1)
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NAME

6       makedepend - create dependencies in makefiles
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SYNOPSIS

9       makedepend  [ -Dname=def ] [ -Dname ] [ -Iincludedir ] [ -Yincludedir ]
10       [ -a ] [ -fmakefile ] [ -include file ] [ -oobjsuffix ] [ -pobjprefix ]
11       [  -sstring  ] [ -wwidth ] [ -v ] [ -m ] [ -- otheroptions -- ] source‐
12       file ...
13

DESCRIPTION

15       The makedepend program reads each sourcefile in sequence and parses  it
16       like  a  C-preprocessor,  processing  all  #include,  #define,  #undef,
17       #ifdef, #ifndef, #endif, #if, #elif and #else directives so that it can
18       correctly  tell  which #include, directives would be used in a compila‐
19       tion.  Any  #include,  directives  can  reference  files  having  other
20       #include directives, and parsing will occur in these files as well.
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22       Every  file that a sourcefile includes, directly or indirectly, is what
23       makedepend calls a dependency.  These dependencies are then written  to
24       a makefile in such a way that make(1) will know which object files must
25       be recompiled when a dependency has changed.
26
27       By default, makedepend places its output in the file named makefile  if
28       it  exists, otherwise Makefile.  An alternate makefile may be specified
29       with the -f option.  It first searches the makefile for the line
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31           # DO NOT DELETE THIS LINE -- make depend depends on it.
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33       or one provided with the -s option, as a delimiter for  the  dependency
34       output.   If  it  finds it, it will delete everything following this to
35       the end of the makefile and put the output  after  this  line.   If  it
36       doesn't  find  it, the program will append the string to the end of the
37       makefile and place the output  following  that.   For  each  sourcefile
38       appearing on the command line, makedepend puts lines in the makefile of
39       the form
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41            sourcefile.o: dfile ...
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43       Where sourcefile.o is the name from the command line  with  its  suffix
44       replaced  with  ``.o'',  and  dfile  is  a  dependency  discovered in a
45       #include directive while parsing sourcefile or  one  of  the  files  it
46       included.
47

EXAMPLE

49       Normally,  makedepend  will be used in a makefile target so that typing
50       ``make depend'' will bring the dependencies up to date  for  the  make‐
51       file.  For example,
52           SRCS = file1.c file2.c ...
53           CFLAGS = -O -DHACK -I../foobar -xyz
54           depend:
55                   makedepend -- $(CFLAGS) -- $(SRCS)
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OPTIONS

58       The  program will ignore any option that it does not understand so that
59       you may use the same arguments that you would for cc(1).
60
61       -Dname=def or -Dname
62            Define.  This places a definition for name in makedepend's  symbol
63            table.  Without =def the symbol becomes defined as ``1''.
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65       -Iincludedir
66            Include  directory.   This  option  tells  makedepend  to  prepend
67            includedir to its list of directories to search when it encounters
68            a  #include  directive.   By default, makedepend only searches the
69            standard include directories (usually /usr/include and possibly  a
70            compiler-dependent directory).
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72       -Yincludedir
73            Replace  all  of  the standard include directories with the single
74            specified include directory; you can omit the includedir to simply
75            prevent searching the standard include directories.
76
77       -a   Append  the dependencies to the end of the file instead of replac‐
78            ing them.
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80       -fmakefile
81            Filename.  This allows you to specify  an  alternate  makefile  in
82            which  makedepend  can  place its output.  Specifying ``-'' as the
83            file name (i.e., -f-) sends the output to standard output  instead
84            of modifying an existing file.
85
86       -include file
87            Process file as input, and include all the resulting output before
88            processing the regular input file. This has the same affect as  if
89            the specified file is an include statement that appears before the
90            very first line of the regular input file.
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92       -oobjsuffix
93            Object file suffix.  Some systems may have object files whose suf‐
94            fix  is  something  other  than ``.o''.  This option allows you to
95            specify another suffix, such as ``.b'' with -o.b or ``:obj''  with
96            -o:obj and so forth.
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98       -pobjprefix
99            Object  file  prefix.   The prefix is prepended to the name of the
100            object file. This is usually used to designate a different  direc‐
101            tory for the object file.  The default is the empty string.
102
103       -sstring
104            Starting  string  delimiter.  This option permits you to specify a
105            different string for makedepend to look for in the makefile.
106
107       -wwidth
108            Line width.  Normally, makedepend will ensure  that  every  output
109            line  that  it  writes will be no wider than 78 characters for the
110            sake of readability.  This  option  enables  you  to  change  this
111            width.
112
113       -v   Verbose operation.  This option causes makedepend to emit the list
114            of files included by each input file.
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116       -m   Warn about multiple inclusion.  This option causes  makedepend  to
117            produce  a  warning  if  any input file includes another file more
118            than once.  In  previous  versions  of  makedepend  this  was  the
119            default behavior; the default has been changed to better match the
120            behavior of the C  compiler,  which  does  not  consider  multiple
121            inclusion  to  be  an error.  This option is provided for backward
122            compatibility, and to aid in debugging problems related to  multi‐
123            ple inclusion.
124
125       -- options --
126            If  makedepend  encounters  a  double  hyphen (--) in the argument
127            list, then any unrecognized argument following it will be silently
128            ignored; a second double hyphen terminates this special treatment.
129            In this way, makedepend can be made to safely ignore esoteric com‐
130            piler  arguments  that  might  normally  be found in a CFLAGS make
131            macro (see the EXAMPLE section above).  All options  that  makede‐
132            pend  recognizes and appear between the pair of double hyphens are
133            processed normally.
134

ALGORITHM

136       The approach used in this program enables it to run an order of  magni‐
137       tude  faster  than any other ``dependency generator'' I have ever seen.
138       Central to this performance are two assumptions: that  all  files  com‐
139       piled  by  a  single makefile will be compiled with roughly the same -I
140       and -D options; and that most files in a single directory will  include
141       largely the same files.
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143       Given  these assumptions, makedepend expects to be called once for each
144       makefile, with all source files that are  maintained  by  the  makefile
145       appearing  on the command line.  It parses each source and include file
146       exactly once, maintaining an internal symbol table for each.  Thus, the
147       first file on the command line will take an amount of time proportional
148       to the amount of time that a normal C preprocessor takes.  But on  sub‐
149       sequent  files,  if  it  encounters an include file that it has already
150       parsed, it does not parse it again.
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152       For example, imagine you are compiling two files, file1.c and  file2.c,
153       they  each  include  the header file header.h, and the file header.h in
154       turn includes the files def1.h and def2.h.  When you run the command
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156           makedepend file1.c file2.c
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158       makedepend will parse  file1.c  and  consequently,  header.h  and  then
159       def1.h and def2.h.  It then decides that the dependencies for this file
160       are
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162           file1.o: header.h def1.h def2.h
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164       But when the  program  parses  file2.c  and  discovers  that  it,  too,
165       includes  header.h,  it  does  not  parse  the  file,  but  simply adds
166       header.h, def1.h and def2.h to the list of dependencies for file2.o.
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SEE ALSO

169       cc(1), make(1)
170

BUGS

172       makedepend parses, but does not currently evaluate,  the  SVR4  #predi‐
173       cate(token-list)  preprocessor  expression; such expressions are simply
174       assumed to be true.  This may cause the wrong #include directives to be
175       evaluated.
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177       Imagine  you  are  parsing  two  files,  say  file1.c and file2.c, each
178       includes the file def.h.  The list of files that def.h  includes  might
179       truly  be  different  when def.h is included by file1.c than when it is
180       included by file2.c.  But once makedepend arrives at a list  of  depen‐
181       dencies for a file, it is cast in concrete.
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AUTHOR

184       Todd Brunhoff, Tektronix, Inc. and MIT Project Athena
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1884th Berkeley Distribution      makedepend 1.0.4                  MAKEDEPEND(1)
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