[Bug c++/62306] New: [4.9/5 Regression?] Change in the comdat used for constructors

[rafael.espindola at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62306

            Bug ID: 62306
           Summary: [4.9/5 Regression?] Change in the comdat used for
                    constructors
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rafael.espindola at gmail dot com
                CC: jason at redhat dot com

Given

struct Option {
  virtual ~Option() {}
};
template <class DataType> class opt : public Option {};
template class opt<int>;

before r206182 

gcc would print

.section    .text._ZN3optIiED0Ev,"axG",@progbits,_ZN3optIiED0Ev,comdat

now it prints

.section    .text._ZN3optIiED0Ev,"axG",@progbits,_ZN3optIiED5Ev,comdat

It looks reasonable to use D5, but it is not clear if that was intentional and
there are no tests for this change in behaviour.