Well - the petscconf.h is identicall for both builds. So the change in behavior must be due to some internal changes in ifort on Mac [as you say - it works fine on linux] Can you try using the branch 'balay/ftn-command_argument' - and see if that works for you? Satish On Wed, 16 Sep 2015, Blaise A Bourdin wrote:

Hi Satish,

It is at https://filestogeaux.lsu.edu/public/download.php?FILE=bourdin/38806CDddLJ

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On Sep 16, 2015, at 10:34 AM, Satish Balay <[email protected]> wrote:

Do you have configure.log fr intel-15 compiler - on the same machine?

It would be good to compare petscconf.h between intel-15 and intel-16.

bourdin@galerkin:petsc-dev (master)$ diff Darwin-intel15.0-g//include/petscconf.h Darwin-intel16.0-g//include/petscconf.h 85c85 < #define PETSC_LIB_DIR "/opt/HPC/petsc-dev/Darwin-intel15.0-g/lib" ---

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#define PETSC_LIB_DIR "/opt/HPC/petsc-dev/Darwin-intel16.0-g/lib" 489c489 < #define PETSC_ARCH "Darwin-intel15.0-g"

---

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#define PETSC_ARCH "Darwin-intel16.0-g” Not very exciting!

I am attaching the one for intel16