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Diffstat (limited to 'doc/user/less-simple.xml')
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1 files changed, 59 insertions, 2 deletions
diff --git a/doc/user/less-simple.xml b/doc/user/less-simple.xml index c17bdae..6de1075 100644 --- a/doc/user/less-simple.xml +++ b/doc/user/less-simple.xml @@ -21,7 +21,7 @@ <!-- - Copyright (c) 2001 - 2017 The SCons Foundation + Copyright (c) 2001 - 2019 The SCons Foundation Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the @@ -644,4 +644,61 @@ Program('bar', bar_files) </section> -</chapter> + <section> + <title>Overriding construction variables when calling a Builder</title> + + <para> + + It is possible to override or add construction variables + when calling a builder method by passing additional keyword arguments. + These overridden or added variables will only be in effect when + building the target, so they will not affect other parts of the build. + For example, if you want to add additional libraries for just one program: + + </para> + + <programlisting> +env.Program('hello', 'hello.c', LIBS=['gl', 'glut']) + </programlisting> + + <para> + + or generate a shared library with a non-standard suffix: + + </para> + + <programlisting> +env.SharedLibrary('word', 'word.cpp', + SHLIBSUFFIX='.ocx', + LIBSUFFIXES=['.ocx']) + </programlisting> + + <para> + + It is also possible to use the <literal>parse_flags</literal> keyword argument in an + override: + + </para> + + <para> + + This example adds 'include' to &cv-link-CPPPATH;, + 'EBUG' to &cv-link-CPPDEFINES;, and 'm' to &cv-link-LIBS;. + + </para> + + <programlisting> +env = Program('hello', 'hello.c', parse_flags = '-Iinclude -DEBUG -lm') + </programlisting> + + <para> + + Within the call to the builder action the environment is not cloned, + instead an OverrideEnvironment() is created which is more + light weight than a whole Environment() + + </para> + + </section> + +</chapter>
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