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<HTML
><HEAD
><TITLE
>Adding an external dependency</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.74b"><LINK
REL="HOME"
TITLE="fastdep manual"
HREF="book1.htm"><LINK
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>fastdep manual</TH
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><H1
><A
NAME="AEN90"
>Chapter 5. Adding an external dependency</A
></H1
><P
>Suppose you change your Makefile. For example you add -O2 to the CFLAGS
variable, because finally it's release time. Of course all object files
have to be regenerated. The classical way to do that is</P
><PRE
CLASS="SCREEN"
>make clean
make</PRE
><P
>But isn't it easier to let all .o files depend on the Makefile itself? 
	So that once you touch the makefile, all objects are immediatly out of
	date and thus regenerated.
	That's what the --extraremakedep= option is for.</P
><DIV
CLASS="EXAMPLE"
><A
NAME="AEN95"
></A
><P
><B
>Example 5-1. Adding an extra dependency to all targets</B
></P
><PRE
CLASS="PROGRAMLISTING"
>.depend:
	fastdep --extraremakedep=Makefile \
			  --remakedeptarget=.depend $(SOURCES) &#62; .depend

-include .depend</PRE
></DIV
><P
>Here is a possible result</P
><PRE
CLASS="SCREEN"
>file1.o: file1.cc \
	header1.h \
	header2.h \
	header3.h
file2.o: file2.cc \
	header1.h \
	header3.h \
	header4.h \
.depend: \
	file1.cc \
	header1.h \
	header2.h \
	header3.h \
	file2.cc \
	header4.h \
	Makefile</PRE
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>Automatically regenerating dependency information</TD
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