82 lines
2 KiB
Groff
82 lines
2 KiB
Groff
.TH MKDEP 1 "February 1st, 2010"
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.SH NAME
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mkdep \- print dependencies in the Right Way for make(1)
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.SH SYNOPSIS
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.B mkdep
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.I path
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.br
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.B mkdep
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.I pp_command
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.IR sourcefile " ... "
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.SH DESCRIPTION
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.B Mkdep
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does what
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.B cpp -M
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should do, but no compiler gets it right, they all
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strip the leading path of the \fI*.o\fP files.
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.PP
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The first synopsis form just creates the needed
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.I .depend
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files in all the subdirectories of
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.IR path .
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.PP
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The second synopsis form does the hard work of emitting the
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dependencies instructions for
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.IR sourcefile
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in the right format expected by
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.IR make (1),
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including the path information.
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.PP
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.B Mkdep
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expects
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.I pp_command
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to be the correct invocation for the preprocessor
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.\" FIXME: there are no cpp(1x) manpage presently...
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.\" .IR cpp (1x)
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command adequate for
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.IR sourcefile ,
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and also expects this command to emit lines of the form
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.nf
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.ta +1i +\w'# lineno "filename"'u+2m
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# \fIlineno\fP "\fIfilename\fP"
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.fi
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for each files which is included by the named
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.IR sourcefile .
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.PP
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For C, the typical idiom is to add in all your
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.IR Makefile s:
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.PP
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.nf
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.ta +0.2i +\w'depend:'u+1m +\w'mkdep "$(CC) -E $(CPPFLAGS)" *.c > .depend'u+2m
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depend:
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cd sub1 && $(MAKE) -$(MAKEFLAGS) $@
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cd sub2 && $(MAKE) -$(MAKEFLAGS) $@
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# repeat for each subdirectory
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mkdep "$(CC) -E $(CPPFLAGS)" *.c > .depend
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.PP
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.fi
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.SH "SEE ALSO"
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.BR cc (1),
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.BR make (1).
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.SH BUGS
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Since
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.I Makefile
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is read in full before any command is executed,
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there is no way to prevent
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.IR make (1)
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to report an error if the
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.I .depend
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file was not created beforehand; hence the first form of
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.IR mkdep
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should be used \fBbefore\fP any attempt is done to use this feature in any
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.IR Makefile .
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.PP
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The current version hardcodes the \fI.o\fP suffix, so it cannot be used for e.g.
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.IR flex (1)
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or
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.IR yacc (1)
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source files.
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.SH AUTHOR
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.I Mkdep.c
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was written by Kees J. Bot and Jorrit N. Herder.
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.\" This manual page by A. Leca.
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