[Bug c/65345] New: ICE with _Generic selection on _Atomic int

[tijl at coosemans dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65345

            Bug ID: 65345
           Summary: ICE with _Generic selection on _Atomic int
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tijl at coosemans dot org

gcc49 (FreeBSD Ports Collection) 4.9.3 20150218 (prerelease)

% cat test.c
_Atomic int i;  
int j = _Generic( i+1, int: 1, default: 0 );

% gcc49 -c test.c
tmp.c:2:1: internal compiler error: Segmentation fault
 int j = _Generic( i+1, int: 1, default: 0 );
 ^
no stack trace because unwind library not available
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


The error only happens when "i" is part of an expression, so _Generic(i,...)
works correctly (it returns 1).  Qualifiers like const and volatile instead of
_Atomic also work.