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Detecting that AC_PROG_LIBTOOL has been invoked

From: Benoit Sigoure
Subject: Detecting that AC_PROG_LIBTOOL has been invoked
Date: Fri, 14 Dec 2007 12:10:06 +0100

is it possible to detect that AC_PROG_LIBTOOL has been invoked, either at runtime by looking at a shell variable that Libtool defines or preferably at autoreconf-time by looking at one of the m4 macros it defines? I'd like something that works on reasonably old versions of Libtool (like, 3 year old versions which I think you can still find out there).

The reason why I'm asking this is that I wrote some macros that rely on Libtool's magic handling of -R and even though it's clearly stated in the doc/comments/README that Libtool is mandatory, people keep running in troubles because they didn't use Libtool, so I'd like to trigger an error, somehow, to tell them that they did something wrong.


Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory

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