[petsc-users] Install PETSc 3.14 with Conda type environment

[Barry Smith]

 Ling,

 Configure  is failing here.

TESTING: checkCPreprocessor from config.setCompilers(config/BuildSystem/config/setCompilers.py:699)
  Locate a functional C preprocessor
Checking for program /Users/lzou/miniconda3/bin/gcc...found
              Defined make macro "CPP" to "gcc -E"
Preprocessing source:
#include "confdefs.h"
#include "conffix.h"
#include <stdlib.h>
Executing: gcc -E  -I/var/folders/fd/yx1jblsj2rzb981kx8ksm03ssqvm65/T/petsc-2jvhontx/config.setCompilers  /var/folders/fd/yx1jblsj2rzb981kx8ksm03ssqvm65/T/petsc-2jvhontx/config.setCompilers/conftest.c 
Possible ERROR while running preprocessor: exit code 1
stdout:
# 1 "/var/folders/fd/yx1jblsj2rzb981kx8ksm03ssqvm65/T/petsc-2jvhontx/config.setCompilers/conftest.c"

So for some reason the gcc -E seems to work correctly but produces an non-zero exit code? 

I notice something very concerning in your Conda environment. It seems to have a gcc (GCC) 4.8.5 which is more ancient than my son who is in college. I cannot imagine you would want to use such an old compiler. Perhaps if you upgrade the Conda environment to use a recent gcc then the other problem will go away. 

Please give that a try and let us know how it goes, send configure.log again if configure still fails.
 
  Good luck,

  Barry


  Locate a functional C compiler
Checking for program /Users/lzou/miniconda3/bin/gcc...found
Executing: gcc --version
stdout:
gcc (GCC) 4.8.5
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


> On Nov 15, 2020, at 4:27 PM, Zou, Ling via petsc-users <petsc-users at mcs.anl.gov> wrote:
> 
> Hi,
>  
> I have installed PETSc many times before, so not so new to it.
> Recently, I have switched to conda system to manage my working environment, and would like to reinstall PETSc, and had some issue during the ‘config’ stage:
>  
> *******************************************************************************
>          UNABLE to CONFIGURE with GIVEN OPTIONS    (see configure.log for details):
> -------------------------------------------------------------------------------
> Cannot find a C preprocessor
> *******************************************************************************
>  
> Config file is also attached.
> Appreciate your help.
>  
> -Ling
> <configure.log>

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