[petsc-users] Build error: vecimpl.h:124:98: error: expected declaration specifiers or '...' before string constant

[Jacob Faibussowitsch]

This is a bug in GCC 9. Can you try the following:

$ make clean
$ make CFLAGS+='-std=gnu11’

Best regards,

Jacob Faibussowitsch
(Jacob Fai - booss - oh - vitch)

> On Apr 18, 2023, at 10:07, Zongze Yang <yangzongze at gmail.com> wrote:
> 
> No, it doesn't. It has the same problem. I just `make clean` and the `make`. Do I need to reconfigure?
> 
> Best wishes,
> Zongze
> 
> 
> On Tue, 18 Apr 2023 at 21:09, Satish Balay <balay at mcs.anl.gov> wrote:
> Does this change work?
> 
> diff --git a/include/petsc/private/vecimpl.h b/include/petsc/private/vecimpl.h
> index dd75dbbc00b..168540b546e 100644
> --- a/include/petsc/private/vecimpl.h
> +++ b/include/petsc/private/vecimpl.h
> @@ -110,7 +110,7 @@ struct _VecOps {
>    PetscErrorCode (*setvaluescoo)(Vec, const PetscScalar[], InsertMode);
>  };
> 
> -#if defined(offsetof) && (defined(__cplusplus) || (PETSC_C_VERSION >= 11))
> +#if defined(offsetof) && (defined(__cplusplus) || (PETSC_C_VERSION >= 17))
>    #if (PETSC_C_VERSION >= 11) && (PETSC_C_VERSION < 23)
>      // static_assert() is a keyword since C23, before that defined as macro in assert.h
>      #include <assert.h>
> 
> 
> Satish
> 
> On Tue, 18 Apr 2023, Zongze Yang wrote:
> 
> > Hi, I am building petsc using gcc at 9.5.0, and found the following error:
> > 
> > ```
> > In file included from /usr/include/alloca.h:25,
> >                  from /usr/include/stdlib.h:497,
> >                  from
> > /home/lrtfm/opt/firedrake/complex-int32/petsc/include/petscsys.h:1395,
> >                  from
> > /home/lrtfm/opt/firedrake/complex-int32/petsc/include/petscsf.h:7,
> >                  from
> > /home/lrtfm/opt/firedrake/complex-int32/petsc/src/vec/is/sf/interface/vscat.c:1:
> > /home/lrtfm/opt/firedrake/complex-int32/petsc/include/petsc/private/vecimpl.h:124:15:
> > error: expected declaration specifiers or '...' before '__builtin_offsetof'
> >   124 | static_assert(offsetof(struct _VecOps, loadnative) == sizeof(void
> > (*)(void)) * VECOP_LOADNATIVE, "");
> >       |               ^~~~~~~~
> > In file included from
> > /home/lrtfm/opt/firedrake/complex-int32/petsc/src/vec/is/sf/interface/vscat.c:7:
> > /home/lrtfm/opt/firedrake/complex-int32/petsc/include/petsc/private/vecimpl.h:124:98:
> > error: expected declaration specifiers or '...' before string constant
> >   124 | static_assert(offsetof(struct _VecOps, loadnative) == sizeof(void
> > (*)(void)) * VECOP_LOADNATIVE, "");
> >       |
> >                              ^~
> > ```
> > 
> > Could someone give me some hints to fix it? The configure.log and make.log
> > are attached.
> > 
> > 
> > Best wishes,
> > Zongze
> > 
>