[Bug c++/84080] [6/7/8 Regression] the compiler crashes when compiling the following sample file

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84080

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-01-29
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org,
                   |                            |nathan at gcc dot gnu.org
   Target Milestone|---                         |6.5
            Summary|the compiler crashes when   |[6/7/8 Regression] the
                   |compiling the following     |compiler crashes when
                   |sample file                 |compiling the following
                   |                            |sample file
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Seems to ICE starting with r185768 when return type deduction has been added
for -std=c++1y.
The ICE in cgraph code, where we rely on being able to compute
DECL_ASSEMBLER_NAME, but the mangling code refuses to give that, as it consider
it dependent.
Even the full name:
"T foo() [with cc n = (cc)0; T = auto]"
suggests that after deducing the return type we haven't updated the template
parameter to what we've really deduced.