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| 39 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
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| 40 | <a name="bbv2.faq.external"></a>Can I get output of external program as a variable in a Jamfile? |
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| 41 | </h2></div></div></div> |
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| 42 | <p>From time to time users ask how to run an external program and save |
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| 43 | the result in Jamfile variable, something like: |
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| 44 | </p> |
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| 45 | <pre class="programlisting"> |
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| 46 | local gtk_includes = [ RUN_COMMAND gtk-config ] ; |
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| 47 | </pre> |
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| 48 | <p> |
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| 49 | Unfortunately, this is not possible at the moment. However, if the |
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| 50 | result of command invocation is to be used in a command to some tool, |
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| 51 | and you're working on Unix, the following workaround is possible. |
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| 52 | </p> |
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| 53 | <pre class="programlisting"> |
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| 54 | alias gtk+-2.0 : : : : |
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| 55 | <cflags>"`pkg-config --cflags gtk+-2.0`" |
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| 56 | <inkflags>"`pkg-config --libs gtk+-2.0`" |
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| 57 | ; |
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| 58 | </pre> |
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| 59 | <p> |
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| 60 | If you use the "gtk+-2.0" target in sources, then the properties |
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| 61 | specified above will be added to the build properties and eventually |
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| 62 | will appear in the command line. Unix command line shell processes |
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| 63 | the backticks quoting by running the tool and using its output -- |
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| 64 | which is what's desired in that case. Thanks to Daniel James for |
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| 65 | sharing this approach. |
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