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From: "joerg.richter@pdv-fs.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [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&)
Date: Fri, 14 Sep 2012 07:58:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D52887

--- Comment #22 from J=C3=B6rg Richter <joerg.richter@pdv-fs.de> 2012-09-14=
 07:58:16 UTC ---
I have reduced a real live case. But still using <vector>.

$ cat t.cc
#include <vector>
struct ClassicUpdate
{
    ClassicUpdate();
};
typedef std::vector<ClassicUpdate> ClassicUpdates;
struct UpdateData
{
    ClassicUpdates classicUpdates;

    UpdateData( ClassicUpdates const& classicUpdates )
      : classicUpdates( classicUpdates )
    {}
};
int main()
{}

$ g++ -std=3Dgnu++0x -o mm t.cc -save-temps

$ grep Construct.*ClassicUpdate *.s
        .weak   _ZSt10_ConstructI13ClassicUpdateIRKS0_EEvPT_DpOT0_[DS]
  ...

This should demostrate that GCC compiles a symbol referencing ClassicUpdate
into the executable. When the AIX linker decides to use that symbol you get=
=20
an undefined reference error. This is not the case here. But the unreduced=
=20
source has the problem.

GCC 4.6.3 doesn't do this. And removing -std=3Dgnu++0x works too.

So it seems this is not regex-related but a deeper bug in GCC 4.7 that emit=
s=20
functions that are never called.