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POHow to test a C++ library usability in configure.in?
 

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    <p>I'm working on a C++ project on GNU/Linux and I'm looking for a way to test the existence and usability of IBM Informix's library with the Autotools - namely, editing a <code>configure.in</code>. I don't have experience with Autotools, so basically I'm picking up from the project's <code>configure.in</code> <em>et al.</em> scripts and copying&amp;changing where I feel needs to be changed. IOW, I've been adapting from the existing text in <code>configure.in</code>.</p> <p>So far I've been using successfully the <code>AC_CHECK_LIB</code> in <code>configure.in</code> to test whether a certain library both exists and is usable. But this only seems to work with libraries with <em>functions</em>, not e.g. classes. Namely, this fails when testing Informix's <code>libifc++.so</code> library:</p> <pre><code>AC_CHECK_LIB(ifc++, ITString, INFORMIX_LIB="-L$INFORMIX_LIB_LOCATION/c++ -lifc++ -L$INFORMIX_LIB_LOCATION -L$INFORMIX_LIB_LOCATION/dmi -L$INFORMIX_LIB_LOCATION/esql -lifdmi -lifsql -lifasf -lifgen -lifos -lifgls -lifglx $INFORMIX_LIB_LOCATION/esql/checkapi.o -lm -ldl -lcrypt -lnsl", echo "* WARNING: libifc++.so not found!" INFORMIX_INC="" INFORMIX_LIB="" ) </code></pre> <p>I've also tried using other combinations, like <code>ITString::ITString</code>, etc.</p> <p>I haven't found a "pure" function in Informix's API (i.e., one that isn't contexted in a C++ class). So I'm hoping that either there's a way to use <code>AC_CHECK_LIB</code> in this context, or there's another <code>autoconf</code>/<code>configure.in</code> "command" for this specific use.</p> <p>Thanks in advance for your feedback.</p>
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