[Bug symtab/11846] New: struct should not permit ->

[Bug symtab/11846] New: struct should not permit ->

[jan dot kratochvil at redhat dot com]

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struct
  {
    int x;
  }
s = { 42 };
int main (void) { return s.x; }

OK:
(gdb) p s.x
$2 = 42
But this is wrong:
(gdb) p s->x
$3 = 42
GCC prints:
.c:6: error: invalid type argument of ‘->’ (have ‘struct <anonymous>’)

GNU gdb (GDB) 7.2.50.20100728-cvs

-- 
           Summary: struct should not permit ->
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: symtab
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: jan dot kratochvil at redhat dot com
                CC: gdb-prs at sourceware dot org
GCC target triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11846

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[Bug symtab/11846] struct should not permit ->

[schwab at linux-m68k dot org]

------- Additional Comments From schwab at linux-m68k dot org  2010-07-28 11:17 -------
GDB also permits . on a pointer to struct, so this could be considered
convenience.  Apparently . and -> are basically treated the same.

-- 


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[Bug symtab/11846] struct should not permit ->

[pedro at codesourcery dot com]

------- Additional Comments From pedro at codesourcery dot com  2010-07-28 11:24 -------
>From the manual:

@item .@r{, }->
Structure member, and pointer-to-structure member.  For convenience,
@value{GDBN} regards the two as equivalent, choosing whether to dereference a
pointer based on the stored type information.
Defined on @code{struct} and @code{union} data.


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[Bug symtab/11846] struct should not permit ->

[jan dot kratochvil at redhat dot com]

------- Additional Comments From jan dot kratochvil at redhat dot com  2010-07-28 11:28 -------
I did not know, OK, thanks.

It is true GDB also intentionally lookups `static' objects from other files
which is also not exactly following the C language rules.

Which I may disagree with but this is all I can do.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://sourceware.org/bugzilla/show_bug.cgi?id=11846

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[Bug symtab/11846] struct should not permit ->

[tromey at redhat dot com]

------- Additional Comments From tromey at redhat dot com  2010-07-28 16:33 -------
FWIW --

I think there are some minor differences between the two.
And, we may introduce a few more, since it isn't clear that, e.g.,
"foo.x" should use an overloaded operator->

-- 


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