[Bug c/53532] New: function call ignored when called with argument of incompatible, undefined structure

[Bug c/53532] New: function call ignored when called with argument of incompatible, undefined structure

[machata at post dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

             Bug #: 53532
           Summary: function call ignored when called with argument of
                    incompatible, undefined structure
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: machata@post.cz


The following code...

struct aaa {};
extern int xxx(struct aaa e);
int main() {
  xxx((struct bbb) {});
  return 0;
}

... compiles without warnings and the call to xxx is ignored:
# gcc -Wall -Wextra -c foo.c
# objdump -x foo.o
[...]
Disassembly of section .text:
0000000000000000 <main>:
   0:    55                   push   %rbp
   1:    48 89 e5             mov    %rsp,%rbp
   4:    b8 00 00 00 00       mov    $0x0,%eax
   9:    5d                   pop    %rbp
   a:    c3                   retq
[...]

The code above seems invalid, and I think that gcc should reject it.

The definition of struct aaa is somehow important.  When dropped, GCC realizes
things are wrong, and complains abundantly.

# LANG=C gcc -Wall -Wextra -x c /dev/stdin
extern int xxx(struct aaa e);
int main() {
  xxx((struct bbb) {});
  return 0;
}
/dev/stdin:1:23: warning: 'struct aaa' declared inside parameter list [enabled
by default]
/dev/stdin:1:23: warning: its scope is only this definition or declaration,
which is probably not what you want [enabled by default]
/dev/stdin: In function 'main':
/dev/stdin:3:15: error: type of formal parameter 1 is incomplete

It also complains about struct bbb being incomplete, which it didn't mind at
all while aaa was there.

[Bug c/53532] function call ignored when called with argument of incompatible, undefined structure

[joseph at codesourcery dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-05-30 19:08:18 UTC ---
This looks like another case of bug 51034.

[Bug c/53532] function call ignored when called with argument of incompatible, undefined structure

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-05-31
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-05-31 11:12:56 UTC ---
Created attachment 27530
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27530
gcc48-pr53532.patch

Untested fix.  Not a regression though, at least not recent, already 3.2 is
silent on it.

[Bug c/53532] function call ignored when called with argument of incompatible, undefined structure

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-06-12 21:16:24 UTC ---
Author: jakub
Date: Tue Jun 12 21:16:20 2012
New Revision: 188483

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188483
Log:
    PR c/53532
    PR c/51034
    PR c/53196
    * c-decl.c (build_compound_literal): Call c_incomplete_type_error
    if type isn't complete.

    * gcc.dg/pr53532.c: New test.
    * gcc.dg/c99-complit-2.c: Add two new dg-error directives,
    adjust line numbers.
    * gcc.dg/noncompile/950825-1.c: Expect incomplete type error message.
    * gcc.dg/Wcxx-compat-8.c: Likewise.
    * gcc.dg/pr51034.c: New test.
    * gcc.dg/pr53196-1.c: New test.
    * gcc.dg/pr53196-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr51034.c
    trunk/gcc/testsuite/gcc.dg/pr53196-1.c
    trunk/gcc/testsuite/gcc.dg/pr53196-2.c
    trunk/gcc/testsuite/gcc.dg/pr53532.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-decl.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/Wcxx-compat-8.c
    trunk/gcc/testsuite/gcc.dg/c99-complit-2.c
    trunk/gcc/testsuite/gcc.dg/noncompile/950825-1.c

[Bug c/53532] function call ignored when called with argument of incompatible, undefined structure

[LpSolit at netscape dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-06-12 21:16:24 UTC ---
Author: jakub
Date: Tue Jun 12 21:16:20 2012
New Revision: 188483

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188483
Log:
    PR c/53532
    PR c/51034
    PR c/53196
    * c-decl.c (build_compound_literal): Call c_incomplete_type_error
    if type isn't complete.

    * gcc.dg/pr53532.c: New test.
    * gcc.dg/c99-complit-2.c: Add two new dg-error directives,
    adjust line numbers.
    * gcc.dg/noncompile/950825-1.c: Expect incomplete type error message.
    * gcc.dg/Wcxx-compat-8.c: Likewise.
    * gcc.dg/pr51034.c: New test.
    * gcc.dg/pr53196-1.c: New test.
    * gcc.dg/pr53196-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr51034.c
    trunk/gcc/testsuite/gcc.dg/pr53196-1.c
    trunk/gcc/testsuite/gcc.dg/pr53196-2.c
    trunk/gcc/testsuite/gcc.dg/pr53532.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-decl.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/Wcxx-compat-8.c
    trunk/gcc/testsuite/gcc.dg/c99-complit-2.c
    trunk/gcc/testsuite/gcc.dg/noncompile/950825-1.c

[Bug c/53532] function call ignored when called with argument of incompatible, undefined structure

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
                 CC|                            |mpolacek at gcc dot gnu.org
         Resolution|---                         |FIXED

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.

[Bug c/53532] function call ignored when called with argument of incompatible, undefined structure

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53532

Bug 53532 depends on bug 51034, which changed state.

Bug 51034 Summary: invalid typeof usage
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51034

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED