[Bug bootstrap/52887] Bootstrap on AIX failure: Undefined symbol: .std::function<void (std::__regex::_PatternCursor const&, std::__regex::_Results&)>::function(std::function<void (std::__regex::_PatternCursor const&, std::__regex::_Results&)> const&)

[dje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52887

--- Comment #18 from David Edelsohn <dje at gcc dot gnu.org> 2012-06-20 21:14:36 UTC ---
Strangely, someone else is reporting a runtime error with the same symbol:

exec(): 0509-036 Cannot load program a.out because of the following errors:
rtld: 0712-001 Symbol
_ZNSt8functionIFvRKNSt7__regex14_PatternCursorERNS0_8_ResultsEEEC1ERKS7_
was referenced from module
/opt/freeware/lib/gcc/powerpc-ibm-aix6.1.0.0/4.7.1/ppc64/libstdc++.a(libstdc++.so.6),
but a runtime definition of the symbol was not found.
rtld: 0712-001 Symbol
_ZNSt8functionIFbRKNSt7__regex14_PatternCursorEEEC1ERKS5_ was
referenced from module
/opt/freeware/lib/gcc/powerpc-ibm-aix6.1.0.0/4.7.1/ppc64/libstdc++.a(libstdc++.so.6),
but a runtime definition of the symbol was not found.
rtld: 0712-002 fatal error: exiting.

Maybe the <regex> code is non-functional, but *something* is referencing the
symbol under certain circumstances. The kludge patch fixes it, so the missing
instantiation is a problem. In the shared library case, if the symbol really is
referenced, I don't know how this is working on GNU/Linux.