[Bug c++/60742] New: ill-formed declarator (array) in selection statement not caught appropriately

[Bug c++/60742] New: ill-formed declarator (array) in selection statement not caught appropriately

[filip.roseen at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60742

            Bug ID: 60742
           Summary: ill-formed declarator (array) in selection statement
                    not caught appropriately
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: filip.roseen at gmail dot com

Created attachment 32527
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32527&action=edit
testcase.cpp

int main () {
  if (int a[3] = {1,2,3}) {
    (void)a;
  }
}


-------------------------------------------------------------

[stmt.select]p2:

  > The rules for conditions apply both to selction-statements and to
  > the for and while statements (6.5) __The declarator shall not
  > specify a function or an array.__ If the auto type-specifier appears
  > in the decl-specifier-seq, the type of the identifier being
  > declared is deduced from the initializer as described in 7.1.6.4.

-------------------------------------------------------------

H20:/tmp% g++ -std=c++11 -pedantic-errors testcase.cpp;      
H20:/tmp% g++ -std=c++11 -pedantic-errors -Waddress testcase.cpp;
testcase.cpp: In function ‘int main()’:
testcase.cpp:2:25: warning: the address of ‘a’ will always evaluate as ‘true’
[-Waddress]
   if (int a[3] = {1,2,3}) {

-------------------------------------------------------------

As seen above a diagnostic is only issued if we do `-Waddress` (or some warning
flag that includes the mentioned one).

The problem isn't actually with the address of `a` always evaluting to `true`,
the major problem is that this kind of code is ill-formed; gcc should therefore
reject it.

[ Note: `clang` and `icc` both handles this correctly (ie. rejects it) ]
>From gcc-bugs-return-448149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 02 20:55:40 2014
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From: "vmakarov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/60650] [ARM] LRA ICE in assign_by_spills
Date: Wed, 02 Apr 2014 20:55:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`650

--- Comment #12 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
Author: vmakarov
Date: Wed Apr  2 20:55:02 2014
New Revision: 209038

URL: http://gcc.gnu.org/viewcvs?rev 9038&root=gcc&view=rev
Log:
2014-04-02  Vladimir Makarov  <vmakarov@redhat.com>

    PR rtl-optimization/60650
    * lra-constraints.c (process_alt_operands): Decrease reject for
    earlyclobber matching.

2014-04-02  Vladimir Makarov  <vmakarov@redhat.com>

    PR rtl-optimization/60650
    * gcc.target/arm/pr60650-2.c: New.


Added:
    trunk/gcc/testsuite/gcc.target/arm/pr60650-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/lra-constraints.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/60742] ill-formed declarator (array) in selection statement not caught appropriately

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60742

Ville Voutilainen <ville.voutilainen at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-14
                 CC|                            |ville.voutilainen at gmail dot com
     Ever confirmed|0                           |1
      Known to fail|                            |4.8.2, 4.9.1, 5.0