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<para>
We've already seen how you can use the &Alias;
function to create a target named <literal>install</literal>:
</para>
<programlisting>
env = Environment()
hello = env.Program('hello.c')
env.Install('/usr/bin', hello)
env.Alias('install', '/usr/bin')
</programlisting>
<para>
You can then use this alias on the command line
to tell &SCons; more naturally that you want to install files:
</para>
<screen>
% <userinput>scons -Q install</userinput>
cc -o hello.o -c hello.c
cc -o hello hello.o
Install file: "hello" as "/usr/bin/hello"
</screen>
<para>
Like other &Builder; methods, though,
the &Alias; method returns an object
representing the alias being built.
You can then use this object as input to anothother &Builder;.
This is especially useful if you use such an object
as input to another call to the &Alias; &Builder;,
allowing you to create a hierarchy
of nested aliases:
</para>
<programlisting>
env = Environment()
p = env.Program('foo.c')
l = env.Library('bar.c')
env.Install('/usr/bin', p)
env.Install('/usr/lib', l)
ib = env.Alias('install-bin', '/usr/bin')
il = env.Alias('install-lib', '/usr/lib')
env.Alias('install', [ib, il])
</programlisting>
<para>
This example defines separate <literal>install</literal>,
<literal>install-bin</literal>,
and <literal>install-lib</literal> aliases,
allowing you finer control over what gets installed:
</para>
<screen>
% <userinput>scons -Q install-bin</userinput>
cc -o foo.o -c foo.c
cc -o foo foo.o
Install file: "foo" as "/usr/bin/foo"
% <userinput>scons -Q install-lib</userinput>
cc -o bar.o -c bar.c
ar rc libbar.a bar.o
ranlib libbar.a
Install file: "libbar.a" as "/usr/lib/libbar.a"
% <userinput>scons -Q -c /</userinput>
Removed foo.o
Removed foo
Removed /usr/bin/foo
Removed bar.o
Removed libbar.a
Removed /usr/lib/libbar.a
% <userinput>scons -Q install</userinput>
cc -o foo.o -c foo.c
cc -o foo foo.o
Install file: "foo" as "/usr/bin/foo"
cc -o bar.o -c bar.c
ar rc libbar.a bar.o
ranlib libbar.a
Install file: "libbar.a" as "/usr/lib/libbar.a"
</screen>
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