Re: Octave gcc problem (Homebrew Mac)

[Sebastian Schöps]

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
> 
>