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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang -O2 doesn't export the same symbols as gcc with virtual destructor"
href="https://bugs.llvm.org/show_bug.cgi?id=45322">45322</a>
</td>
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<th>Summary</th>
<td>clang -O2 doesn't export the same symbols as gcc with virtual destructor
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sylvestre@debian.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>Happening on a bunch of cases here:
<a href="https://clang.debian.net/status.php?version=9.0.1&key=CHANGE_SYM_LIB">https://clang.debian.net/status.php?version=9.0.1&key=CHANGE_SYM_LIB</a>
Probably not a recent issue
=== a.cpp ===
#include <stddef.h>
namespace pugi {
class xml_writer {
public:
virtual ~xml_writer() {}
};
class a : xml_writer {
virtual void b(const void *, size_t);
};
void a::b(const void *, size_t) {}
} // namespace pugi
=== script
ARG=" -O2 -o pugixml.cpp.o -c a.cpp"
CXX=/usr/bin/clang++
$CXX $ARG
mv pugixml.cpp.o clang.o
CXX=/usr/bin/g++-9
$CXX $ARG
mv pugixml.cpp.o gcc.o
nm clang.o |grep -q N4pugi10xml_writerD2Ev
nm gcc.o |grep -q N4pugi10xml_writerD2Ev
===
Will show:
nm clang.o |grep N4pugi10xml_writerD2Ev
0000000000000000 W _ZN4pugi10xml_writerD2Ev
nm gcc.o |grep N4pugi10xml_writerD2Ev
===
without -O2, gcc will generate the symbol too.
maybe clang should remove too when -O2 is used?</pre>
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