[Bug c++/69696] incorrect initialization of block-scope flexible array members

["egallager at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69696

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|2016-02-05 00:00:00         |2017-08-29
                 CC|                            |egallager at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
I get slightly different output, but same basic problem:

$ /usr/local/bin/g++ -Wall -Wextra -Wpedantic -xc++ -o 69696.exe 69696.c
69696.c:3:22: warning: ISO C++ forbids flexible array member ‘a’ [-Wpedantic]
 struct A { int n, a []; };
                      ^
69696.c:4:32: warning: initialization of a flexible array member [-Wpedantic]
 struct A a0 = { 1, { 2, 3, 4 } };
                                ^
69696.c: In function ‘int main()’:
69696.c:22:46: warning: initialization of a flexible array member [-Wpedantic]
         static struct A a = { 1, { 2, 3, 4 } };
                                              ^
69696.c:28:22: warning: function-scope ‘i’ implicitly auto and declared
‘__thread’
         __thread int i = X;
                      ^
69696.c:29:27: warning: function-scope ‘a’ implicitly auto and declared
‘__thread’
         __thread struct A a = { 1, { 2, 3, 4 } };
                           ^
69696.c:29:48: warning: initialization of a flexible array member [-Wpedantic]
         __thread struct A a = { 1, { 2, 3, 4 } };
                                                ^
69696.c:30:22: warning: function-scope ‘j’ implicitly auto and declared
‘__thread’
         __thread int j = Y;
                      ^
69696.c:36:39: warning: initialization of a flexible array member [-Wpedantic]
         struct A a = { 1, { 2, 3, 4 } };
                                       ^
$ ./69696.exe

i = 12345678
a = { 1, { 2, 3, 4 }
j = 87654321

i = 12345678
a = { 1, { 0, 0, 4194928 }
j = 87654321
Abort trap
$

Also, as a separate issue, the "implicitly auto and declared __thread" warning
should have its own separate flag controlling it.