[Bug c/64856] New: Initializing struct not accepted in gnu99

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64856

            Bug ID: 64856
           Summary: Initializing struct not accepted in gnu99
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org

struct A {
  unsigned long b;
};

struct B {
  struct A c[2];
};

struct B d = { .c = { [0 ... 1] = (struct A){ .b = -1UL } } };

$ ./cc1 -quiet j.c -std=gnu90
$ ./cc1 -quiet j.c -std=gnu99
j.c:9:35: error: initializer element is not constant
 struct B d = { .c = { [0 ... 1] = (struct A){ .b = -1UL } } };
                                   ^
j.c:9:35: note: (near initialization for ‘d.c[0]’)
j.c:9:35: error: initializer element is not constant
j.c:9:35: note: (near initialization for ‘d.c[1]’)

This is bad with gnu11 as a default.
>From gcc-bugs-return-475384-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 29 11:48:07 2015
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From: "bugs at stellardeath dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/64854] No bound check for explicit-shape arrays
Date: Thu, 29 Jan 2015 11:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64854

--- Comment #2 from Lorenz Hüdepohl <bugs at stellardeath dot org> ---
(Please remove the line "use m1" from my example, its a leftover from a
previous
 version)

I'm not denying that there is a mistake in the example program. I just hoped
that -fcheck=bounds would save me from this kind of mistake.

Please consider this not a bug report then, but a feature request :)

It really would help tremendously if this kind of misbehaviour could be checked
at run-time via -fcheck-bounds.
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From: "alserkli at inbox dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/64803] [5 Regression] __LINE__ inside macro is not constant
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd803

--- Comment #4 from Alexander Klimov <alserkli at inbox dot ru> ---
Thanks! Your patch works for llvm.