[Bug c/63480] -Wmissing-field-initializers should not warn about intentionally empty initializers (or that should be a separate option)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63480

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Found it: PR61489

I think warning for {0} is on purpose, since one cannot tell if the struct
originally had one field and now it has two. But I don't really agree with it.
I think it is too noisy.
>From gcc-bugs-return-463537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 08 09:34:33 2014
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From: "vogt at linux dot vnet.ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/60406] recover.go: test13reflect2 test failure
Date: Wed, 08 Oct 2014 09:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60406

--- Comment #23 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
Regarding the new patch:

1) We need to call __builtin_extract_return_address(retaddr) in
__go_set_defer_retaddr() too.  (On s390 (31 bit) this is necessary to remove
the most significant bit of the address which indicates the addressing mode.)

I.e.

--snip--
-    g->defer->__retaddr = retaddr;
+    g->defer->__retaddr = __builtin_extract_return_addr (retaddr);
--snip--


2) The new patch does not compile for me:

--
In file included from ../../../libgo/runtime/go-check-interface.c:8:0:
../../../libgo/runtime/go-panic.h:43:13: error: conflicting types for
‘__go_makefunc_can_recover’
 extern void __go_makefunc_can_recover (void *retaddr);
             ^
In file included from ../../../libgo/runtime/go-check-interface.c:7:0:
../../../libgo/runtime/runtime.h:845:9: note: previous declaration of
‘__go_makefunc_can_recover’ was here
 void    __go_makefunc_can_recover (const void *);
         ^
--

In runtime.h, __go_makefunc_can_recover still has a "const" argument:

--snip--
-void    __go_makefunc_can_recover (const void *);
+void    __go_makefunc_can_recover (void *);
--snip--


3) Couldn't this be written more efficiently by passing a flag?

+  /* If we are called from __go_makefunc_can_recover, then we need to
+     look one level higher.  */
+  if (locs[0].function.len > 0
+      && __builtin_strcmp ((const char *) locs[0].function.str,
+               "__go_makefunc_can_recover") == 0)

E.g.

  _Bool __go_can_recover (void *retaddr, _Bool called_by_makefunc_can_recover)
  {
    ...
    if (called_by_makefunc_can_recover)
      { do something }
    else
      { do something else }
    ...
  }


4) With the suggested changes from 1 and 2 above:

s390x (64 bit):

* PASS: test/recover.go
* the test from #4 in my earlier posting works as expected
* my private defer/recover/panic testsuite works as expected

s390 (31 bit):

* PASS: test/recover.go
* the test from #4 in my earlier posting works as expected
* my private defer/recover/panic testsuite works as expected


5) I find the assumption in the loop at the end of __go_can_recover() that if a
caller's name begins with "__go_" that means the panic can be recovered, a bit
hairy.  Even if it is with the current libgo, an unrelated change elsewhere
could break this logic.
>From gcc-bugs-return-463538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 08 09:38:26 2014
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/63480] -Wmissing-field-initializers should not warn about intentionally empty initializers (or that should be a separate option)
Date: Wed, 08 Oct 2014 09:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63480

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
The C warning is also nicer than the C++ one because it says where the field is
declared. It also only mentions one missing field per declaration, whereas the
C++ warning mentions all, which is terribly noisy and repetitive.
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Subject: [Bug fortran/63473] Memory leak with ALLOCATABLE, INTENT(OUT) dummy arguments.
Date: Wed, 08 Oct 2014 09:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc473

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
It's probably related (but not identical) to not deallocating
allocatable-scalars function results after their use [PR55603] and not
finalizing function results (after their value has been used) [PR37336 ?].