[Bug libstdc++/112997] New: _Unwind_Exception conflicts with void*. failed to build with clang

[Bug libstdc++/112997] New: _Unwind_Exception conflicts with void*. failed to build with clang

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

            Bug ID: 112997
           Summary: _Unwind_Exception conflicts with void*. failed to
                    build with clang
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

../../../gcc/libstdc++-v3/libsupc++/eh_call.cc:39:1: error: conflicting types
for '__cxa_call_terminate'
   39 | __cxa_call_terminate(void* ue_header_in) throw ()
      | ^
../../../gcc/libstdc++-v3/libsupc++/unwind-cxx.h:170:17: note: previous
declaration is here
  170 | extern "C" void __cxa_call_terminate (_Unwind_Exception*) throw ()

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-12-13
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Why are you building libstdc++ sources with clang? I doubt that is supported.

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also can you provide the full command line that is failing?

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's not supported. If you need to make it work, that's your problem. Just do
something like:

--- a/libstdc++-v3/libsupc++/eh_call.cc
+++ b/libstdc++-v3/libsupc++/eh_call.cc
@@ -25,7 +25,9 @@
 #include <bits/c++config.h>
 #include <cstdlib>
 #include <bits/exception_defines.h>
+#define __cxa_call_terminate __cxa_call_terminatexxx
 #include "unwind-cxx.h"
+#undef __cxa_call_terminate

 using namespace __cxxabiv1;

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #4 from cqwrteur <unlvsur at live dot com> ---
(In reply to Andrew Pinski from comment #1)
> Why are you building libstdc++ sources with clang? I doubt that is supported.

GCC does not support WebAssembly backend

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to cqwrteur from comment #4)
> (In reply to Andrew Pinski from comment #1)
> > Why are you building libstdc++ sources with clang? I doubt that is supported.
> 
> GCC does not support WebAssembly backend

Then libstdc++ has not been ported . Or you implement add a WebAssembly backend
to GCC.

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think we can just change the declaration in unwind-cxx.h

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #7 from cqwrteur <unlvsur at live dot com> ---
(In reply to Andrew Pinski from comment #5)
> (In reply to cqwrteur from comment #4)
> > (In reply to Andrew Pinski from comment #1)
> > > Why are you building libstdc++ sources with clang? I doubt that is supported.
> > 
> > GCC does not support WebAssembly backend
> 
> Then libstdc++ has not been ported . Or you implement add a WebAssembly
> backend to GCC.

i do not know whether binutils has implemented wasm. Or i would like to
implement a wasm backend to GCC tbh.

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[arsen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

Arsen Arsenović <arsen at gcc dot gnu.org> changed:

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

--- Comment #8 from Arsen Arsenović <arsen at gcc dot gnu.org> ---
(In reply to cqwrteur from comment #7)
> (In reply to Andrew Pinski from comment #5)
> > (In reply to cqwrteur from comment #4)
> > > (In reply to Andrew Pinski from comment #1)
> > > > Why are you building libstdc++ sources with clang? I doubt that is supported.
> > > 
> > > GCC does not support WebAssembly backend
> > 
> > Then libstdc++ has not been ported . Or you implement add a WebAssembly
> > backend to GCC.
> 
> i do not know whether binutils has implemented wasm. Or i would like to
> implement a wasm backend to GCC tbh.

Binutils also do not have WASM.  Please do give writing a backend a shot.  I've
been interested in such a project in the past but I've not had time to study
wasm or to actually initiate codewriting.

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:8c5d00f8291d718ef64c742b9c971e16f75e5074

commit r14-6975-g8c5d00f8291d718ef64c742b9c971e16f75e5074
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Dec 13 09:45:44 2023 +0000

    libstdc++: Avoid conflicting declaration in eh_call.cc [PR112997]

    r14-1527-g2415024e0f81f8 changed the parameter of the
    __cxa_call_terminate definition, but there's also a declaration in
    unwind-cxx.h which should have been changed too.

    libstdc++-v3/ChangeLog:

            PR libstdc++/112997
            * libsupc++/unwind-cxx.h (__cxa_call_terminate): Change first
            parameter to void*.

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|WONTFIX                     |FIXED
   Target Milestone|---                         |14.0

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed

[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |tschwinge at gcc dot gnu.org

--- Comment #11 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
ACK; I had the same change in my WIP tree:

    In my GCN and nvptx target libstdc++ work (WIP), I see:

        [...]/source-gcc/libstdc++-v3/libsupc++/eh_call.cc:39:1: error:
conflicting C language linkage declaration ‘void __cxa_call_terminate(void*)’
[-Werror]
           39 | __cxa_call_terminate(void* ue_header_in) throw ()
              | ^~~~~~~~~~~~~~~~~~~~
        In file included from
[...]/source-gcc/libstdc++-v3/libsupc++/eh_call.cc:28:
        [...]/source-gcc/libstdc++-v3/libsupc++/unwind-cxx.h:170:17: note:
previous declaration ‘void
__cxxabiv1::__cxa_call_terminate(_Unwind_Exception*)’
          170 | extern "C" void __cxa_call_terminate (_Unwind_Exception*) throw
()
              |                 ^~~~~~~~~~~~~~~~~~~~
        cc1plus: all warnings being treated as errors
        make[4]: *** [eh_call.lo] Error 1