Re: Compilation failure for openblas-0.3.7-1 under OSX 10.11.6

On 20 Feb 2020, at 4:47 am, Hanspeter Niederstrasser <[email protected]> wrote:
> 
>> smallscaling.c: In function 'omp_bench':
>> smallscaling.c:163:19: error: 'CLOCK_MONOTONIC' undeclared (first use in this function)
>>   163 |     clock_gettime(CLOCK_MONOTONIC, &tick);
>>       |                   ^~~~~~~~~~~~~~~
> 
> 
>> Distribution version: selfupdate-git Mon Feb 17 11:41:32 2020, 10.11, x86_64
>> Trees: local/main stable/main unstable/main
>> Xcode.app: 8.2.1
>> Xcode command-line tools: 8.2.0.0.1.1480973914
> 
> Some older versions of OS X did not have CLOCK_MONOTONIC, but I don't remember when OS X acquired it. However, you do have a mismatch between Xcode and the command line tools. Do you still get the failure if you upgrade the CLT to 8.2.1? Sometimes mismatched header versions cause similar failures.
> 
> After upgrading the command line tools, if you run `grep -rn CLOCK_MONOTONIC /usr/include`, hopefully /usr/include.time.h will show up as #defining CLOCK_MONOTONIC. If it does, then openblas should hopefully build. If it's not there, then openblas-0.3.7 might need to be restricted.

I’ve seen some discussion online about OS X prior to 10.12 not making the clock_gettime function available.
I do not have a 10.11 system available at the moment to try and debug this, but if you are still running into the
error after updating your command line tools, could you test if a workaround is perhaps already provided for in
the OpenBLAS build by editing the openblas.info file, to add the lines

        if [ "$darwin_vers" -lt 16 ]; then
                        export MACOSX_DEPLOYMENT_TARGET="10.$darwin_vers"
        fi

to the CompileScript?

Cheers,
					Derek


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