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<H3> 8.3.3 Output Directory </H3>
<!--docid::SEC632::-->
<P>

To avoid polluting the entire directory hierarchy with temporary and
intermediate files, all output from the build process should be placed into a
separate directory intended specifically for such transient files.  By default
this directory is named as follows, and assigned to the makefile variable
`<SAMP>OUT</SAMP>'.
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>OUT = out/$(OS)/$(PROC)/$(MODE)$(MAKE_DLL)
</pre></td></tr></table></P><P>

So, if you're building a dynamic library for Linux on an x86 machine, the
output directory would be named `<TT>out/LINUX/X86/optimize.so/</TT>'.  To
reference to the output directory you should use the variable <CODE>$(OUT)</CODE> in
your submakefiles.  For example, the following rule tells `<SAMP>make</SAMP>' how to
compile `<TT>.cpp</TT>' files:
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>$(OUT)%$O: %.cpp
        $(DO.COMPILE.CPP)
</pre></td></tr></table></P><P>

This rule assumes that the `<TT>.cpp</TT>' file is located in the current
directory; this is wrong of course.  We can avoid this problem in several
ways.  The typical solution is to define a <CODE>vpath</CODE> for `<TT>.cpp</TT>' files,
this way:
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>vpath %.cpp libs/csutil libs/cssys libs/csgfxldr
</pre></td></tr></table></P><P>

This forces `<SAMP>make</SAMP>' to look for `<TT>.cpp</TT>' files in all mentioned
directories.  The overall rule is that each submakefile defines an additional
`<SAMP>vpath</SAMP>' for its own directory or directories.  For example, the
submakefile that defines the rules for building <CODE>$(CSSYS.LIB)</CODE>, the
Crystal Space system library, defines the following `<SAMP>vpath</SAMP>':
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>vpath %.cpp libs/cssys
</pre></td></tr></table></P><P>

However, sometimes you want a separate rule for one or several files.  In this
case you can define a rule for building an object file in the <CODE>$(OUT)</CODE>
directory from a source file in given directory.  If we take the above
example, we could write, instead of that `<SAMP>vpath</SAMP>' directive, the
following:
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>$(OUT)%$O: libs/cssys/%.cpp
        $(DO.COMPILE.CPP) $(CFLAGS.CSSYS)
</pre></td></tr></table></P><P>

If you would like a separate rule for just one or several specific files, you
could do it this way:
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>vpath %.cpp libs/cssys
$(OUT)file1$O: libs/cssys/file1.cpp
        $(DO.COMPILE.CPP) $(CFLAGS.CSSYS)
$(OUT)file2$O: libs/cssys/file2.cpp
        $(DO.COMPILE.CPP) $(CFLAGS.CSSYS)
</pre></td></tr></table><A NAME="Memory Debugger"></A>
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