[Bug c/88568] [8/9 Regression] 'dllimport' no longer implies 'extern' in C

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88568

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amonakov at gcc dot gnu.org
      Known to work|                            |5.3.0
            Summary|GCC cannot dllimport        |[8/9 Regression]
                   |variables with undefined    |'dllimport' no longer
                   |types                       |implies 'extern' in C
      Known to fail|                            |8.1.0

--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
We document that attribute-dllimport implies extern storage class, so this
should be accepted similar to 'extern struct s var; struct s *ptr = &var;'.

MinGW-W64 GCC 5.3 used to accept this, so this is a regression. Unfortunately I
don't have other versions handy to check which releases regressed.