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    <p>Your first point of confusion: <code>Bar::Baz(Qux*, Quux*)</code> does <em>not</em> imply that debug symbols are present (and in fact implies that they are <em>not</em> present).</p> <p>The debugger merely demangles the function name. If the debug symbols were in fact present, you'd see <code>Bar::Baz(Qux* qux = 0x12..., Quux* quux = 0x234...)</code></p> <p>As for the real problem, I suspect that the symbol is defined in some <em>other</em> library, which</p> <ul> <li>appears on the link line for the binary before <code>libfoo.so</code> does, and</li> <li>was built without debug symbols</li> </ul> <p>(The runtime loader will bind the reference to <code>Bar::Baz()</code> to the first definition it sees.)</p> <p>If you print <code>ip</code> in frame #7, then do <code>info symbol &lt;value-just-printed&gt;</code>, I suspect you'll have an "Aha!" moment.</p> <p><strong>EDIT:</strong> Your update made your question self-inconsistent. AFAICT, </p> <ol> <li><code>gdb</code> can see debug symbols when you execute<br> <code>libtool --mode=execute gdb .libs/libfoo.so</code></li> <li>but not when you execute <code>libtool --mode=execute gdb binary</code></li> <li>you've verified that the symbol definition is coming from the <em>exact</em> same <code>.libs/libfoo.o</code></li> <li>and <code>readelf -w</code> doesn't see debug symbols in <code>.libs/libfoo.o</code></li> </ol> <p>At least one of the above statements is likely false.</p> <p>If they are all really true, you probably have a weird <code>GDB</code> <em>and</em> <code>readelf</code> bug (a bug in one is possible, a simultaneous bug in both is somewhat unlikely).</p> <p>Also note that adding <code>-g</code> to <code>LDFLAGS</code> is generally the <em>wrong</em> thing to do. Did you mean to add it to <code>CXXFLAGS</code> instead?</p>
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    1. POMissing line numbers from debug symbols for library in whole program, but not on its own
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    1. COThat's a good point about the name mangling. I'll take a closer look at exactly what's linked in tomorrow morning. I'm doubtful that there's a wrong library involved, since the binary is a test program built in the same tree as the only visible instance of the library that it's supposed to be testing - there are no system installations or anything like that to contend with.
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    2. COI just checked this, and the library linked is the library I expect. A typo I made led to an interesting discovery, with which I will amend the original question.
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    3. COIf you (or anyone else reading this) have other ideas to offer, I'm all ears (eyes, really).
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