[Bug c++/71092] [6/7 Regression] ICE: in cxx_eval_call_expression, at cp/constexpr.c:1449; only with -Os

[buaabyl at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71092

buaabyl at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |buaabyl at gmail dot com

--- Comment #12 from buaabyl at gmail dot com ---
I compile Qt 5.7.0 with MinGW GCC, the Qt program segmentation fault, maybe the
same bug.

GCC: MinGW32-W64
Qt: 5.7.0

The bug just appear in static link, shared link is ok, and error with static +
Os.

this is my test summary:
+============================================================================+
| MinGW32-W64                             | G++  |   Qt 5.5.0  |   Qt 5.7.0  |
|   GCC                                   | FLAGS|static|shared|static|shared|
+-----------------------------------------+------+------+------+------+------+
|i686-4.9.1-release-posix-dwarf-rt_v3-rev2| -Os  | PASS | PASS | PASS | -    |
|                                         | -O2  | -    | PASS | -    | -    |
+-----------------------------------------+------+------+------+------+------+
|i686-5.3.0-release-posix-dwarf-rt_v4-rev0| -Os  | -    | -    | Fault| -    |
|                                         | -O2  | -    | -    | PASS | PASS |
+-----------------------------------------+------+------+------+------+------+
|i686-5.4.0-release-posix-dwarf-rt_v5-rev0| -Os  | -    | -    | Fault| PASS |
|                                         | -O2  | -    | -    | -    | -    |
+-----------------------------------------+------+------+------+------+------+
|i686-6.1.0-release-posix-dwarf-rt_v5-rev0| -Os  | -    | -    | X    | -    |
|                                         | -O2  | -    | -    | PASS | -    |
+-----------------------------------------+------+------+------+------+------+
|                       X     - Compile Fail                                 |
|                       Fault - Segmentation Fault                           |
|                       PASS  - Compile OK, Run Test Pass                    |
+============================================================================+

The compile fail of 6.1.0 show:
"... cxx_eval_call_expression, at cp/constexpr.c:1449"