Re: Octave gcc problem (Homebrew Mac)

[Vic Norton]

Unfortunately your advice didn’t work for me, Sebastian. - Vic

~$ brew install --build-from-source octave
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 3 taps (caskroom/cask, homebrew/core, homebrew/science).
==> Updated Formulae
certbot                                  homebrew/science/plink2
git-extras                               homebrew/science/poretools
homebrew/science/calculix-ccx            homebrew/science/qrupdate ✔
homebrew/science/gmsh                    kubernetes-helm
homebrew/science/p4est                   todoman
homebrew/science/pastix                  yadm
homebrew/science/plasma

Warning: homebrew/science/octave-4.2.1_2 already installed
~$ octave
dyld: Library not loaded: /usr/local/opt/gcc/lib/gcc/7/libgfortran.4.dylib
  Referenced from: /usr/local/bin/octave-cli
  Reason: image not found
Abort trap: 6

> On May 5, 2017, at 8:29 AM, Sebastian Schöps <address@hidden> wrote:
> 
> Dear Vic, 
> 
> you updated by purpose or accident your gcc. This may of course break 
> dependencies like octave. The proper way is to recompile all dependencies, 
> including octave
> 
> brew install --build-from-source octave 
> 
> This is necessary as there is currently no octave binary for the new gcc. 
> However, there will be a new one soon since this is a known issue:
> 
> https://github.com/Homebrew/homebrew-science/issues/4972#issuecomment-299394176
> 
> Sebastian
> 
>> Am 05.05.2017 um 14:18 schrieb Vic Norton <address@hidden>:
>> 
>>> On May 4, 2017, at 5:25 PM, Vic Norton <address@hidden> wrote:
>>> 
>>> 
>>>> On May 4, 2017, at 4:40 PM, Vic Norton <address@hidden> wrote:
>>>> 
>>>> Hi Sebastian,
>>>> 
>>>> I just did a brew upgrade and it killed octave. Here is the error message 
>>>> I get.
>>>> ~$ octave
>>>> dyld: Library not loaded: /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib
>>>> Referenced from: /usr/local/bin/octave-cli
>>>> Reason: image not found
>>>> Abort trap: 6
>>>> 
>>>> Apparently the problem is that
>>>> /usr/local/opt/gcc
>>>> has just become a symbolic link to
>>>> /usr/local/Cellar/gcc/7.1.0
>>>> rather than the previous
>>>> /usr/local/Cellar/gcc/6.3.0_1.
>>>> And a new libgfortran.4.dylib resides in the 7.1.0 version of gcc.
>>>> 
>>>> I hate to mess with Homebrew. I expect the problem might be fixed by 
>>>> forcing
>>>> /usr/local/opt/gcc
>>>> to link to
>>>> /usr/local/Cellar/gcc/6.3.0_1
>>>> as before, but it does seem that Homebrew’s octave-cli should be adjusted 
>>>> for the new address@hidden
>>>> 
>>>> What is your advice? Right now I am dead in the water.
>>>> 
>>>> Regards,
>>>> 
>>>> Vic 
>>> 
>>> Well, I hated to mess with Homebrew, but the above solution did work. I now 
>>> have a working Octave. Here is what I did in Terminal.
>>> 
>>> 1. I changed my directory to /usr/local/opt
>>> 2. I relabeled gcc as gcc-new
>>> 3. I ran
>>> $ ln -s /usr/local/Cellar/gcc/6.3.0_1 gcc
>>> 
>>> Now Octave 4.2.1 works as before, but I’ve messed up the latest Homebrew 
>>> gcc in /usr/local/opt.
>>> 
>>> I don’t like this solution. I’d rather have an Octave that can use 
>>> Homebrew’s address@hidden
>>> 
>>> -
>>> Vic
>> 
>> This morning the Homebrew Octave was upgraded to 4.2.1_2, which now links to 
>> address@hidden, so I undid the above kludge. Now the original error message 
>>>> ~$ octave
>>>> dyld: Library not loaded: /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib
>>>> Referenced from: /usr/local/bin/octave-cli
>>>> Reason: image not found
>>>> Abort trap: 6
>> has gone away, but a new one has taken its place:
>> ~$ octave
>> dyld: Library not loaded: /usr/local/opt/gcc/lib/gcc/6/libgfortran.3.dylib
>>   Referenced from: /usr/local/opt/qrupdate/lib/libqrupdate.1.dylib
>>   Reason: image not found
>> Abort trap: 6
>> Apparently qrupdate has not been upgraded to link to address@hidden
>> 
>> I am giving up my kludges. Is there any way I can get good Octave from 
>> Homebrew?
>> 
>> -
>> Vic
>> 
>> 
>