mirror of
https://github.com/Relintai/scons_gd.git
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127 lines
3.9 KiB
XML
127 lines
3.9 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE sconsdoc [
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<!ENTITY % scons SYSTEM "../scons.mod">
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%scons;
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<!ENTITY % builders-mod SYSTEM "../generated/builders.mod">
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%builders-mod;
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<!ENTITY % functions-mod SYSTEM "../generated/functions.mod">
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%functions-mod;
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<!ENTITY % tools-mod SYSTEM "../generated/tools.mod">
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%tools-mod;
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<!ENTITY % variables-mod SYSTEM "../generated/variables.mod">
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%variables-mod;
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]>
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<chapter id="chap-alias"
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xmlns="http://www.scons.org/dbxsd/v1.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
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<title>Alias Targets</title>
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<!--
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__COPYRIGHT__
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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-->
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<para>
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We've already seen how you can use the &Alias;
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function to create a target named <literal>install</literal>:
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</para>
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<scons_example name="alias_ex1">
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<file name="SConstruct" printme="1">
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env = Environment()
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hello = env.Program('hello.c')
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env.Install('__ROOT__/usr/bin', hello)
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env.Alias('install', '__ROOT__/usr/bin')
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</file>
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<file name="hello.c">
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int main() { printf("Hello, world!\n"); }
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</file>
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</scons_example>
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<para>
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You can then use this alias on the command line
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to tell &SCons; more naturally that you want to install files:
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</para>
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<scons_output example="alias_ex1" os="posix" suffix="1">
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<scons_output_command>scons -Q install</scons_output_command>
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</scons_output>
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<para>
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Like other &Builder; methods, though,
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the &Alias; method returns an object
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representing the alias being built.
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You can then use this object as input to anothother &Builder;.
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This is especially useful if you use such an object
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as input to another call to the &Alias; &Builder;,
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allowing you to create a hierarchy
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of nested aliases:
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</para>
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<scons_example name="alias_ex2">
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<file name="SConstruct" printme="1">
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env = Environment()
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p = env.Program('foo.c')
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l = env.Library('bar.c')
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env.Install('__ROOT__/usr/bin', p)
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env.Install('__ROOT__/usr/lib', l)
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ib = env.Alias('install-bin', '__ROOT__/usr/bin')
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il = env.Alias('install-lib', '__ROOT__/usr/lib')
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env.Alias('install', [ib, il])
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</file>
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<file name="foo.c">
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int main() { printf("foo.c\n"); }
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</file>
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<file name="bar.c">
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void bar() { printf("bar.c\n"); }
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</file>
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</scons_example>
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<para>
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This example defines separate <literal>install</literal>,
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<literal>install-bin</literal>,
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and <literal>install-lib</literal> aliases,
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allowing you finer control over what gets installed:
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</para>
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<scons_output example="alias_ex2" os="posix" suffix="1">
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<scons_output_command>scons -Q install-bin</scons_output_command>
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<scons_output_command>scons -Q install-lib</scons_output_command>
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<scons_output_command>scons -Q -c __ROOT__/</scons_output_command>
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<scons_output_command>scons -Q install</scons_output_command>
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</scons_output>
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</chapter>
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