[petsc-dev] broken options handling with intel 16.0 compilers on mac OS

[Satish Balay]

[from the available logs] its not clear what the issue is.

PETSc fortran interface attempts to use getarg_() and iargc_() [fortran
library functions] - or its variants - directly from C.

This usage is non-standard and messy [and some compiler folks - said -
its unsupported usage].

Also - configure attempts to guess the fortran link libraries - and
constructs a link command cCompilerLibs + cxxCompilerLibs +
fortranCompilerLibs.

Perhaps there is a bug in this detection code - thats triggering this
error. Its verifyable by attempting to use:

--with-clib-autodetect=0 --with-clib-autodetect=0 --with-cxxlib-autodetect=0 LIBS='liblist'

where 'liblist' should be determined manually - for the linking of
C/fortran/CXX to work correctly.

My fix attempts to call command_argument_count(),
get_command_argument() directly from fortran - and if that doesn't
work - then its likely a compiler bug..

[which one can try to replicate with a simple test code]

Satish

On Thu, 17 Sep 2015, Jeff Hammond wrote:

> Please report this via premier.intel.com.
> 
> Jeff
> 
> On Wed, Sep 16, 2015 at 11:13 AM, Blaise A Bourdin <bourdin at lsu.edu> wrote:
> 
> > Hi,
> >
> > I am testing intel 16 compilers under mac OS, and notice that options
> > handling for all past and current versions of petsc is broken in fortran
> > (options are not parsed).
> > I narrowed it down to *argc at start.c:168 always being 0 when intel 16 is
> > used (but taking the right value using intel 15 or gcc 5), but I can’t find
> > my way through the multiple macros to figure out what is really the matter…
> > The problem does not seem to arise under linux with the same compilers.
> >
> > Any idea of what is going on? Any test I can run to help (I assume that
> > you don’t have a test box with the latest intel compilers)? Is it a petsc
> > bug or an intel bug?
> >
> > I use an up to date pets-dev master, and the configure.log file is
> > available at
> > https://filestogeaux.lsu.edu/public/download.php?FILE=bourdin/89329uFByT9
> >
> > Thanks,
> >
> > Blaise
> >
> > --
> > Department of Mathematics and Center for Computation & Technology
> > Louisiana State University, Baton Rouge, LA 70803, USA
> > Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276
> > http://www.math.lsu.edu/~bourdin
> >
> >
> >
> >
> >
> >
> >
> >
> 
> 
>