[petsc-users] PETSc on GCC

[Satish Balay]

> gcc (Ubuntu 4.8.4-2ubuntu1~14.04.4) 4.8.4

Do you have a newer gcc version available for use on this machine?

>>>>>>
/tmp/petsc-7thm2vwz/config.setCompilers/conftest.c: At top level:
cc1: warning: unrecognized command line option "-Wno-lto-type-mismatch" [enabled by default]

            Rejecting compiler flag -std=c99 due to
<<<<<<

Hm - looks configure logic here is failing.

-Wno-lto-type-mismatch checked went through earlier [so this flag was accepted] - but then when a test is retried with "-Wno-lto-type-mismatch -std=c99" its failing

Perhaps one way to work around is to use configure option: CFLAGS=-std=c99

But its better to use a more recent gcc than 4.8.4

Satish

On Thu, 4 Aug 2022, Simon Zhang wrote:

> On Thu, Aug 4, 2022 at 10:05 AM Satish Balay <balay at mcs.anl.gov> wrote:
> 
> > please send the corresponding configure.log
> >
> > Satish
> >
> > On Thu, 4 Aug 2022, Simon Zhang wrote:
> >
> > > To whom it may concern,
> > >
> > > I'm trying to install PETSc on my computer and PETSc is compliant with
> > GCC
> > > but something keeps going wrong at the compilation step. It's returning
> > the
> > > following message.
> > >
> > > PETSc requires c99 compiler! Configure could not determine compatible
> > > compiler flag.
> > >
> > > How can I fix this problem?
> > >
> > > Thank you,
> > > Simon Zhang
> > >
> >
> >
>