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<?xml version='1.0'?>
<!DOCTYPE sconsdoc [
<!ENTITY % scons SYSTEM "../scons.mod">
%scons;
<!ENTITY % builders-mod SYSTEM "../generated/builders.mod">
%builders-mod;
<!ENTITY % functions-mod SYSTEM "../generated/functions.mod">
%functions-mod;
<!ENTITY % tools-mod SYSTEM "../generated/tools.mod">
%tools-mod;
<!ENTITY % variables-mod SYSTEM "../generated/variables.mod">
%variables-mod;
]>
<chapter id="chap-alias"
xmlns="http://www.scons.org/dbxsd/v1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
<title>Alias Targets</title>
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distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
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KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-->
<para>
We've already seen how you can use the &Alias;
function to create a target named <literal>install</literal>:
</para>
<scons_example name="alias_ex1">
<file name="SConstruct" printme="1">
env = Environment()
hello = env.Program('hello.c')
env.Install('__ROOT__/usr/bin', hello)
env.Alias('install', '__ROOT__/usr/bin')
</file>
<file name="hello.c">
int main() { printf("Hello, world!\n"); }
</file>
</scons_example>
<para>
You can then use this alias on the command line
to tell &SCons; more naturally that you want to install files:
</para>
<scons_output example="alias_ex1" os="posix" suffix="1">
<scons_output_command>scons -Q install</scons_output_command>
</scons_output>
<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>
<scons_example name="alias_ex2">
<file name="SConstruct" printme="1">
env = Environment()
p = env.Program('foo.c')
l = env.Library('bar.c')
env.Install('__ROOT__/usr/bin', p)
env.Install('__ROOT__/usr/lib', l)
ib = env.Alias('install-bin', '__ROOT__/usr/bin')
il = env.Alias('install-lib', '__ROOT__/usr/lib')
env.Alias('install', [ib, il])
</file>
<file name="foo.c">
int main() { printf("foo.c\n"); }
</file>
<file name="bar.c">
void bar() { printf("bar.c\n"); }
</file>
</scons_example>
<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>
<scons_output example="alias_ex2" os="posix" suffix="1">
<scons_output_command>scons -Q install-bin</scons_output_command>
<scons_output_command>scons -Q install-lib</scons_output_command>
<scons_output_command>scons -Q -c __ROOT__/</scons_output_command>
<scons_output_command>scons -Q install</scons_output_command>
</scons_output>
</chapter>
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