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Switch to using os.environ, except of modules.peek. Document SHELL.

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[SVN r30453]
This commit is contained in:
Vladimir Prus
2005-08-04 06:51:15 +00:00
parent 45be175435
commit ba866fef5a
1 changed files with 5 additions and 22 deletions
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27
v2/doc/src/faq.xml
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@@ -99,8 +99,8 @@ exe a : a_obj ;
namespace. Therefore, to access environment variable from Jamfile, you'd
need the following code:
<programlisting>
import modules ;
local SOME_LIBRARY_PATH = [ modules.peek : SOME_LIBRARY_PATH ] ;
import os ;
local SOME_LIBRARY_PATH = [ os.environ SOME_LIBRARY_PATH ] ;
exe a : a.cpp : &lt;include&gt;$(SOME_LIBRARY_PATH) ;
</programlisting>
</para>
@@ -180,28 +180,11 @@ exe viewer : viewer png z ;
<title>Can I get output of external program as a variable in a Jamfile?
</title>
<para>From time to time users ask how to run an external program and save
the result in Jamfile variable, something like:
<para>The <code>SHELL</code> builtin can be used for the purpose:
<programlisting>
local gtk_includes = [ RUN_COMMAND gtk-config ] ;
local gtk_includes = [ SHELL "gtk-config --cflags" ] ;
</programlisting>
Unfortunately, this is not possible at the moment. However, if the
result of command invocation is to be used in a command to some tool,
and you're working on Unix, the following workaround is possible.
<programlisting>
alias gtk+-2.0 : : : :
&lt;cflags&gt;"`pkg-config --cflags gtk+-2.0`"
&lt;inkflags&gt;"`pkg-config --libs gtk+-2.0`"
;
</programlisting>
If you use the "gtk+-2.0" target in sources, then the properties
specified above will be added to the build properties and eventually
will appear in the command line. Unix command line shell processes
the backticks quoting by running the tool and using its output --
which is what's desired in that case. Thanks to Daniel James for
sharing this approach.
</para>
</section>
<section>
@@ -342,7 +325,7 @@ exe hello : hello.cpp /site-config//zlib ;
</chapter>
<!--
Local Variables:
mode: xml
mode: nxml
sgml-indent-data: t
sgml-parent-document: ("userman.xml" "chapter")
sgml-set-face: t