[Bug c/19315] document undocumented extension that allows code where variable is not emitted in the asm

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19315

--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 15 11:45:44 2018
New Revision: 263556

URL: https://gcc.gnu.org/viewcvs?rev=263556&root=gcc&view=rev
Log:
Don't make unsized objects into extern.

2018-08-15  Iain Sandoe <i...@sandoe.co.uk>

gcc/c:

        PR c/19315
        * c-decl.c (finish_decl): Don't add the 'extern' storage class to
        objects of unknown size.

gcc/testsuite:

        PR c/19315
        gcc.dg/graphite/pr82451.c: Make array 'a' an extern.
        gcc.dg/redecl-10.c: Expect warnings for the static vars with unknown
        size.


Modified:
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-decl.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/graphite/pr82451.c
    trunk/gcc/testsuite/gcc.dg/redecl-10.c