[Bug libstdc++/83860] [6/7/8 Regression] valarray replacement type breaks with auto and more than one operation

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83860

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |5.4.0
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2018-01-16
     Ever confirmed|0                           |1
            Summary|valarray replacement type   |[6/7/8 Regression] valarray
                   |breaks with auto and more   |replacement type breaks
                   |than one operation          |with auto and more than one
                   |                            |operation
   Target Milestone|---                         |7.3
      Known to fail|                            |6.4.1, 7.2.1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  Works with GCC 5, requires -O1+ to segfault.  Doesn't segfault when
using clang++.

#include <valarray>
int main()
{
  std::valarray<int> va(16), vb(16), vc(16);
  auto sum = va + vb + vc;
  std::valarray<int> vsum = sum;
}