[MacPorts] #35070: gcc47: _GLIBCXX_DEBUG and empty ostringstream

[MacPorts]

#35070: gcc47: _GLIBCXX_DEBUG and empty ostringstream
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  Reporter:  akim.demaille@…  |      Owner:  mww@…
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.1.1
Resolution:                   |   Keywords:
      Port:  gcc47            |
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Comment (by barto@…):

 Adding that g++-mp-4.8 also has this problem.[[BR]]

 And it affects std::string as well.[[BR]]

 ui3(2112) malloc: *** error for object 0x100084f00: pointer being freed
 was not allocated *** set a breakpoint in malloc_error_break to debug

 Breakpoint 2, 0x00007fff97855588 in malloc_error_break ()[[BR]]

 {{{
 (gdb) where
 #1  0x00007fff97856942 in free ()
 #2  0x00000001063c1f3c in std::string::reserve ()
 #3  0x0000010701620000 in ?? ()
 }}}

 Turning off the _GLIBCXX_DEBUG 'fixes' the issue. This is happening in my
 global constructors. So something in the MacPort version of the libstdc++
 library is not working when turning on the debug flag for array bounds
 checking.

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Ticket URL: <https://trac.macports.org/ticket/35070#comment:9>
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