I don't think you comment is related to this problem. Command Line Tools were 
also updated. The "right order" is quite simple with Spack, obviously I had 
whole lot of things re-compiled, including GCC, OpenMPI as well as third party 
packages used in Petsc.

Regards,
Denis

> 2 апр. 2017 г., в 13:43, Unal <[email protected]> написал(а):
> 
> In my experience, each time you update Xcode, you also have to update the 
> Command Line Tools 
> (https://developer.apple.com/downloads/index.action?=command%20line%20tools), 
> and reinstall everything again in the right order; in my case, I have to 
> reinstall Fortran, MPI, HDF5 and PETSc. When one doesn't do it in the right 
> order, it appears problems like what you reported.
> 
> Santiago
> 
>> On 29 Mar 2017, at 07:26, Denis Davydov <[email protected]> wrote:
>> 
>> Thanks Barry, I can confirm that an adaptation of your patch to 3.7.5 allows 
>> to compile PETSc.
>> 
>> Regads,
>> Denis.
>> 
>> 
>>> On 29 Mar 2017, at 06:23, Barry Smith <[email protected]> wrote:
>>> 
>>> 
>>> I have added the commit 
>>> https://bitbucket.org/petsc/petsc/commits/4f290403fdd060d09d5cb07345cbfd52670e3cbc
>>>   to the maint, master and next branch that allows ./configure to to go 
>>> through in this situation.  If the change does not break other tests it 
>>> will be included in the next patch release.
>>> 
>>>  Thanks for reporting the problem,
>>> 
>>>    Barry
>>> 
>>> This patch does not directly deal with the problem (which i don't 
>>> understand but seems to be an Apple Xcode problem) but works around the 
>>> problem on my machine.
>> 
> 

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