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-<!--
-
- __COPYRIGHT__
-
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- 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.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
- KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
- WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- 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.
-
--->
-
-<!--
-
-=head2 The C<AfterBuild> method
-
-The C<AfterBuild> method evaluates the specified perl string after
-building the given file or files (or finding that they are up to date).
-The eval will happen once per specified file. C<AfterBuild> is called
-as follows:
-
- AfterBuild $env 'foo.o', qq(print "foo.o is up to date!\n");
-
-The perl string is evaluated in the C<script> package, and has access
-to all variables and subroutines defined in the F<Conscript> file in
-which the C<AfterBuild> method is called.
-
--->
-
- <para>
-
- By default, &SCons; removes targets before building them.
- Sometimes, however, this is not what you want.
- For example, you may want to update a library incrementally,
- not by having it deleted and then rebuilt from all
- of the constituent object files.
- In such cases, you can use the
- &Precious; method to prevent
- &SCons; from removing the target before it is built:
-
- </para>
-
- <programlisting>
- env = Environment()
- lib = env.Library('foo', ['f1.c', 'f2.c', 'f3.c'])
- env.Precious(lib)
- </programlisting>
-
- <para>
-
- Although the output doesn't look any different,
- &SCons; does not, in fact,
- delete the target library before rebuilding it:
-
- </para>
-
- <screen>
- % <userinput>scons -Q</userinput>
- cc -c -o f1.o f1.c
- cc -c -o f2.o f2.c
- cc -c -o f3.o f3.c
- ar r libfoo.a f1.o f2.o f3.o
- ranlib libfoo.a
- </screen>
-
- <para>
-
- &SCons; will, however, still delete files marked as &Precious;
- when the <literal>-c</literal> option is used.
-
- </para>