Issues with compiler flags in gfortran

[Nicolas Pavillon]

Hi, 

Thanks for the pointer, that indeed does the trick, and compilation works perfectly in both cases (w/o cctools or with cctools+Xcode). I had tried to select as through compiler flags, but I guess this did not affect what gfortran was calling.

However, this then does not solve the underlying issue, For what I understand, the llvm70 variant of cctools is made the default to ensure reproducibility in some builds, but this also comes at a serious cost in terms of compiler optimization with such older tools, isn’t it?

Cheers,

Nicolas


> On Jan 22, 2019, at 11:23, Chris Jones <jonesc at hep.phy.cam.ac.uk> wrote:
> 
> Hi,
> 
> Could you then please try either removing the cctools package, or reinstall it with the xcode variant. Either should result in the build using the xcode provided as instead.
> 
> Chris
> 
> On 21 Jan 2019, at 3:54 pm, Nicolas Pavillon <nicos at macports.org <mailto:nicos at macports.org>> wrote:
> 
>> Hi, 
>> 
>> I just tried that, and I think I have been using the current default:
>> 
>> NicolasMacBook:~ nicos$ port installed cctools
>> The following ports are currently installed:
>>   cctools @921_0+llvm70 (active)
>> 
>> The reason I have been mentioning how old as might be is that the one provided by cctools returns version 1.38, which quite behind compared to the version provided by binutils, for example.
>> 
>> /opt/local/bin/as -v
>> Apple Inc version cctools-921, GNU assembler version 1.38
>> 
>> Cheers,
>> 
>> Nicolas
>> 
>>> On Jan 22, 2019, at 0:23, Chris Jones <jonesc at hep.phy.cam.ac.uk <mailto:jonesc at hep.phy.cam.ac.uk>> wrote:
>>> 
>>> Hi,
>>> 
>>> What exactly version (and variants) of cctools do you have installed ?
>>> 
>>> Perhaps try force removing it, then reinstall, to make sure you are using the current default variants. 
>>> 
>>> Chris
>>> 
>>> On 21 Jan 2019, at 2:47 pm, Nicolas Pavillon <nicos at macports.org <mailto:nicos at macports.org>> wrote:
>>> 
>>>> Hi, 
>>>> 
>>>> I stumbled on some issues with the fortran compiler that I cannot really understand. They might be linked with other topics discussed recently about cctools, but it still seems somewhat different. 
>>>> 
>>>> This happens with the port OpenBLAS, where the compilation fails when flags to compile AVX instructions yield errors during compilation, as described in the following tickets: 
>>>> https://trac.macports.org/ticket/57912 <https://trac.macports.org/ticket/57912>
>>>> https://github.com/xianyi/OpenBLAS/issues/1951 <https://github.com/xianyi/OpenBLAS/issues/1951>
>>>> 
>>>> However, when I tried even more basic flags such as -march=native, compilation also fails with errors such as 
>>>> /var/folders/x8/q7j02h4d661_p7cjh42_jh380000gn/T//ccqkNy6A.s:103:no such instruction: `vxorps %xmm0, %xmm0,%xmm0'
>>>> 
>>>> I then tried with another gfortran compiler outside of macports, and it could compile without any issue if I remove macports’ prefix from the path, which seems to indicate that the issue is coming from the assembler in macports.
>>>> 
>>>> My best guess is that as in cctools is too old, but I am not sure about that. Also, if it is correct, I wonder how this could be solved. Any ideas?
>>>> 
>>>> Cheers,
>>>> 
>>>> Nicolas 
>> 

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