[Bug libstdc++/67114] New: [MinGW64] build failure with POSIX threads enabled

[sliwa at ifpan dot edu.pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67114

            Bug ID: 67114
           Summary: [MinGW64] build failure with POSIX threads enabled
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sliwa at ifpan dot edu.pl
  Target Milestone: ---

Created attachment 36119
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36119&action=edit
proposed patch to GCC

Since operator< is not available for thread types when using the pthreads-win32
library, gcc build fails when configured with POSIX threads on MinGW64.

The attached patch implements a field-by-field comparison.