[Bug c++/66130] New: "invalid use of non-static member function" message could be clearer

[Bug c++/66130] New: "invalid use of non-static member function" message could be clearer

[tromey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

            Bug ID: 66130
           Summary: "invalid use of non-static member function" message
                    could be clearer
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tromey at gcc dot gnu.org
  Target Milestone: ---

Today g++ gave me "invalid use of non-static member function".
However, from the context it was unclear exactly which thing
on the line was the invalid use.  (Mostly due to bug 61940 giving
an imprecise location).

I think this warning would be more useful if it mentioned the name
of the member function in question.  In my case this would have
made the problem immediately clear.

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[manu at gcc dot gnu.org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |easyhack
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-05-12
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Confirmed. A small testcase would help. Perhaps it would be even clearer if it
said something like: "non-static member function can be used only as the
operand for the function call operator()"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idU375

Eliot <dsl at dsl dot pp.ua> changed:

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--- Comment #5 from Eliot <dsl at dsl dot pp.ua> ---
Created attachment 35535
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id5535&actioníit
http://legup.eecg.utoronto.ca

http://legup.eecg.utoronto.ca

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Created attachment 35537
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35537&action=edit
non-working patch

This patch fails for:

struct Local
{
  void f();
};

Local *l;
void (Local::*ptr)();
decltype((l->*ptr)) i;         // { dg-error "member function" }


/home/manuel/test1/src/gcc/testsuite/g++.dg/cpp0x/decltype31.C:11:19: error:
invalid use of non-static member function '#'offset_ref' not supported by
dump_decl#<declaration error>

We don't want to use %qE, but I'm not sure how to extract a declaration from an
offset_ref. 


(It would be great to make such things an ICE with enable-checking, the patch
passes bootstrap+regression tests!)
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Subject: [Bug c++/66135] New: trailing return type generic lambda
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf135

            Bug ID: 66135
           Summary: trailing return type generic lambda
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: barry.revzin at gmail dot com
  Target Milestone: ---

Consider this attempt at implementing fmap for optionals in C++:

#include <boost/optional.hpp>
#include <iostream>

template <typename Func>
auto fmap(Func f)
{
    return [=](auto arg) -> boost::optional<decltype(f(*arg))> { // **
        if (arg) {
            return f(*arg);
        }
        else {
            return boost::none;
        }
    };
}


int main() {
    auto id = fmap([](int i){ return i; });

    auto res = id(boost::optional<int>{42});
    std::cout << *res << std::endl;
}

This code compiles in clang 3.6, but on gcc 5.1 issues an error on the
indicated line:

    error: invalid type argument of unary '*' (have 'auto:1')

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[tromey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #3 from Tom Tromey <tromey at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #1)
> Confirmed. A small testcase would help. Perhaps it would be even clearer if
> it said something like: "non-static member function can be used only as the
> operand for the function call operator()"

Here's something reasonably close to my real-life case:

struct X {
  X(void *);
  void m();
};

struct Y : public X{
  Y(void*a, void *b) : X(m), mb(b) { }
  void *mb;
};


A bit wordy perhaps.  But you can see how the error is unclear (partly
due to that other bug):

pokyo. g++ --syntax-only r.cc
r.cc: In constructor ‘Y::Y(void*, void*)’:
r.cc:7:34: error: invalid use of non-static member function
   Y(void*a, void *b) : X(m), mb(b) { }
                                  ^

It's even worse if you aren't familiar with the code - in my real-life
case, the typo was meant to be one of the argument names, but actually
named a method of a superclass that was in some other file...
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf133

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 13 16:59:20 2015
New Revision: 223171

URL: https://gcc.gnu.org/viewcvs?rev"3171&root=gcc&view=rev
Log:
        PR middle-end/66133
        * omp-low.c (expand_omp_taskreg): For GIMPLE_OMP_TASK expansion,
        make sure it is never noreturn, even when the task body does not
        return.
        (lower_omp_taskreg): For GIMPLE_OMP_TASK, emit GIMPLE_OMP_CONTINUE
        right before GIMPLE_OMP_RETURN.
        (make_gimple_omp_edges): Accept GIMPLE_OMP_CONTINUE as ->cont
        for GIMPLE_OMP_TASK.  For GIMPLE_OMP_RETURN corresponding to
        GIMPLE_OMP_TASK add an EDGE_ABNORMAL edge from entry to exit.

        * testsuite/libgomp.c/pr66133.c: New test.

Added:
    trunk/libgomp/testsuite/libgomp.c/pr66133.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/omp-low.c
    trunk/libgomp/ChangeLog

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #3)
> Here's something reasonably close to my real-life case:

For this testcase, my patch gives:

test.cc:8:34: error: invalid use of non-static member function ‘void X::m()’
   Y(void*a, void *b) : X(m), mb(b) { }
                                  ^

Of course, the location is bug 61940, which seems a bit harder to fix.
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Subject: [Bug fortran/66128] ICE for some intrinsics with zero sized array parameter
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kargl at gcc dot gnu.org changed:

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----------------------------------------------------------------------------
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                 CC|                            |kargl at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from kargl at gcc dot gnu.org ---
Confirmed.

I glance at the simplification code suggests that gfortran
is not considering the possibility of zero-sized constant
arrays.  Not sure how to fix this one.

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[tromey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #5 from Tom Tromey <tromey at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #4)

> For this testcase, my patch gives:
> 
> test.cc:8:34: error: invalid use of non-static member function ‘void X::m()’

That seems great to me.
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Subject: [Bug target/65955] [arm] ICE during movcond_addsi split
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide955

--- Comment #16 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Thu May 14 13:16:32 2015
New Revision: 223195

URL: https://gcc.gnu.org/viewcvs?rev"3195&root=gcc&view=rev
Log:
[ARM] Fix PR 65955: Do not take REGNO on non-REG operand in movcond_addsi

        Backport from mainline
        2015-05-12  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

        PR target/65955
        * config/arm/arm.md (movcond_addsi): Check that operands[2] is a
        REG before taking its REGNO.

Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/config/arm/arm.md

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |paolo.carlini at oracle dot com

--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #5)
> (In reply to Manuel López-Ibáñez from comment #4)
> 
> > For this testcase, my patch gives:
> > 
> > test.cc:8:34: error: invalid use of non-static member function ‘void X::m()’
> 
> That seems great to me.

Perhaps Jason or Paolo know how to extract a declaration from an offset_ref for
the testcase in comment #2.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc513

zf <zfefm at gmx dot de> changed:

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----------------------------------------------------------------------------
                 CC|                            |zfefm at gmx dot de

--- Comment #2 from zf <zfefm at gmx dot de> ---
I have the same problem when I try to build gcc (4.92 or 5.1) on my Macbook OS
10.9.5.
On my MacPro, also runing 10.9.5, this builds without problems. I have not yet
found the reason for this difference.

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
First blush I'm wondering if in this specific case we couldn't forward from
dump_decl to dump_expr and just print ‘l->*ptr’. AFAICS, wouldn't be a
regression and would allow us to adopt immediately Manuel' patch.
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From: "luca.stoppa at bbh dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/66157] New: bits/random.tcc compiler error when using -fno-for-scope
Date: Fri, 15 May 2015 09:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66157

            Bug ID: 66157
           Summary: bits/random.tcc compiler error when using
                    -fno-for-scope
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: luca.stoppa at bbh dot com
  Target Milestone: ---

Created attachment 35545
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35545&action=edit
That example won't compile

Compiling a minimal example (empty main) that includes <algorithm> will result
into a compilation error.

g++ -std=c++14 -fno-for-scope m.cpp

/opt/rh/devtoolset-3/root/usr/include/c++/4.9.1/bits/random.tcc: In member
function âvoid std::seed_seq::generate(_RandomAccessIterator,
_RandomAccessIterator)â:
/opt/rh/devtoolset-3/root/usr/include/c++/4.9.1/bits/random.tcc:3444:19: error:
redeclaration of âstd::size_t __kâ
       for (size_t __k = __m; __k < __m + __n; ++__k)
                   ^
/opt/rh/devtoolset-3/root/usr/include/c++/4.9.1/bits/random.tcc:3422:19: note:
âstd::size_t __kâ previously declared here
       for (size_t __k = 0; __k < __m; ++__k)

I have checked the newest libstdc++ source code and the but is still there.
I would like to know whether
- "-fno-for-scope" is still a supported flag for c++11/14/1y, in that case I
believe I hit an implementation error. In case you decide this is really an
error the fix is really easy: __k should be changed to __k1 in the first loop,
__k2 in the second loop, and so on.
- if it is not supported, I think the gcc documentation should be updated.

Testcases:
g++ -std=c++11 -fno-for-scope m.cpp won't compile
g++ -std=c++14 -fno-for-scope m.cpp won't compile
g++ -std=c++1y -fno-for-scope m.cpp won't compile

when removing -fno-for-scope everything is fine.

Thanks,
Luca
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Subject: [Bug middle-end/66134] [CHKP] ICE: Unable to coalesce ssa_names 18 and 17 which are marked as MUST COALESCE
Date: Fri, 15 May 2015 09:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf134

--- Comment #1 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
Author: ienkovich
Date: Fri May 15 09:38:44 2015
New Revision: 223215

URL: https://gcc.gnu.org/viewcvs?rev"3215&root=gcc&view=rev
Log:
gcc/

        PR middle-end/66134
        * tree-chkp.c (chkp_get_orginal_bounds_for_abnormal_copy): New.
        (chkp_maybe_copy_and_register_bounds): Don't copy abnormal copy.

gcc/testsuite/

        PR middle-end/66134
        * gcc.target/i386/mpx/pr66134.c: New test.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-chkp.c

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Paolo Carlini from comment #7)
> First blush I'm wondering if in this specific case we couldn't forward from
> dump_decl to dump_expr and just print ‘l->*ptr’. AFAICS, wouldn't be a
> regression and would allow us to adopt immediately Manuel' patch.

I could simply do

if (DECL_P(expr)) error("%qD") else error("%qE")

but I was trying to avoid %qE because I think pretty-printing user coded
expressions is something we should always avoid since they usually do not come
out as written by the user.

I would prefer to print:

error: invalid use of non-static member function 'void (Local::*ptr)()'

which tells the user that ->*ptr is a pointer to member-function.
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Subject: [Bug target/66140] ICE at extract_insn, at recog.c:2343 when compiling for alpha with gcc-5.1.1
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Uroš Bizjak <ubizjak at gmail dot com> changed:

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----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
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   Target Milestone|---                         |4.9.3

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
Patch at [1].

[1] https://gcc.gnu.org/ml/gcc-patches/2015-05/msg01396.html
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64968

--- Comment #41 from Uroš Bizjak <ubizjak at gmail dot com> ---
The GCC bugzilla favicon now shows generic Bugzilla favicon. Previously, it was
a GCC favicon.
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Subject: [Bug target/66140] ICE at extract_insn, at recog.c:2343 when compiling for alpha with gcc-5.1.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf140

--- Comment #3 from dhowells at redhat dot com <dhowells at redhat dot com> ---
The compiler works now, thanks!

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> ---
(In reply to Manuel López-Ibáñez from comment #8)
> (In reply to Paolo Carlini from comment #7)
> > First blush I'm wondering if in this specific case we couldn't forward from
> > dump_decl to dump_expr and just print ‘l->*ptr’. AFAICS, wouldn't be a
> > regression and would allow us to adopt immediately Manuel' patch.
> 
> I could simply do
> 
> if (DECL_P(expr)) error("%qD") else error("%qE")

Sure.

> but I was trying to avoid %qE because I think pretty-printing user coded
> expressions is something we should always avoid since they usually do not
> come out as written by the user.

In general, I know that ;)

> I would prefer to print:
> 
> error: invalid use of non-static member function 'void (Local::*ptr)()'
> 
> which tells the user that ->*ptr is a pointer to member-function.

But the error message is about l->*ptr, not about ptr per se. Thus I think that
in such cases using dump_type (or %qT at the call site) on TREE_TYPE (t)
(TREE_TYPE (expr)) should be Ok.
>From gcc-bugs-return-486356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 15 15:32:10 2015
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Subject: [Bug c++/13981] Give message about incomplete class that might be implicitly upcasted.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id\x13981

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
                 CC|                            |tromey at gcc dot gnu.org

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 66161 has been marked as a duplicate of this bug. ***

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
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                 CC|paolo.carlini at oracle dot com    |
           Assignee|unassigned at gcc dot gnu.org      |paolo.carlini at oracle dot com

--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Agreed, thanks Manuel. I can handle this, send the complete patch to the
mailing list for review. I think that in the second case it would be more
correct to tweak the error message a bit, and actually say "invalid use of
non-static member function of type %qT", instead of just "... function %qT".

[Bug c++/66130] "invalid use of non-static member function" message could be clearer

[paolo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66130

--- Comment #12 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Jun  3 19:23:20 2015
New Revision: 224099

URL: https://gcc.gnu.org/viewcvs?rev=224099&root=gcc&view=rev
Log:
2015-06-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>
            Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/66130
        * typeck.c (invalid_nonstatic_memfn_p): Add location_t parameter and
        use it in the diagnostic.
        (decay_conversion): Adjust call.
        * semantics.c (finish_decltype_type): Likewise.
        * call.c (resolve_args, build_new_op_1,
        perform_implicit_conversion_flags): Adjust calls.
        * cvt.c (ocp_convert, convert_to_void): Likewise.
        * cp-tree.h (invalid_nonstatic_memfn_p): Update declaration.

2015-06-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>
            Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/66130
        * g++.dg/other/pr66130.C: New.
        * g++.dg/cpp0x/pr66130.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/pr66130.C
    trunk/gcc/testsuite/g++.dg/other/pr66130.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/call.c
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/cvt.c
    trunk/gcc/cp/semantics.c
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/66130] "invalid use of non-static member function" message could be clearer
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf130

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
           Assignee|paolo.carlini at oracle dot com    |unassigned at gcc dot gnu.org
   Target Milestone|---                         |6.0

--- Comment #13 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Done.