Re: problem with ifelse

[Eric Blake]

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According to Vincent Torri on 3/6/2009 7:30 AM:
> As the value of want_ecore_win32 changes acoording to the host, i think
> I'll have to use AS_IF or if / then /else. Which one is better ?

AS_IF is nicer if you invoke other autoconf macros within the body,
because it handles hoisting prerequisites prior to the if statement.  In
other words:

if ...; then
  MACRO_WITH_PREREQ
fi
=>
if ...
  prereq
  macro_body
fi

which is a bug, if the rest of your script depends on prereq having run
regardless of whether macro_body was run (and that is often the case).  On
the other hand,

AS_IF([...], [MACRO_WITH_PREREQ])
=>
prereq
if ...
  macro_body
fi

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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