Re: [dpdk-ci] Compiling dpdk in non compilation tests

["Richardson, Bruce" <bruce.richardson@intel.com>]

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Sunday, October 25, 2020 8:36 AM
> To: dpdklab@iol.unh.edu; Lincoln Lavoie <lylavoie@iol.unh.edu>
> Cc: ci@dpdk.org; Thomas Monjalon <thomas@monjalon.net>; Richardson, Bruce
> <bruce.richardson@intel.com>
> Subject: Compiling dpdk in non compilation tests
> 
> Looking at CI reports this morning, I noticed this on the series "ice:
> update base code".
> 
> https://lab.dpdk.org/results/dashboard/patchsets/13992/
> 
> - Compilation is failing on OpenSuse, but I think this is because its
> toolchain does not have AVX512 support.
> This seems to be a regression introduced by the series, indeed, cool.
> 
> 
> - On Ubuntu 18.04, build is fine, but unit tests are ko.
> Looking into the unit tests zipped logs, I can see that:
> * the unit tests job builds its own binaries,
> * the unit tests environment is not the same as the build test
> environment (only copying significant differences below):
> 
> Build:
> The Meson build system
> Version: 0.55.3
> ...
> C compiler for the host machine: cc (gcc 7.5.0 "cc (Ubuntu
> 7.5.0-3ubuntu1~18.04) 7.5.0")
> C linker for the host machine: cc ld.bfd 2.30
> ...
> Run-time dependency libpcap found: YES 1.8.1
> Has header "pcap.h" with dependency libpcap: YES
> ...
> Fetching value of define "__AVX2__" : 1
> Fetching value of define "__AVX512BW__" : 1
> Fetching value of define "__AVX512CD__" : 1
> Fetching value of define "__AVX512DQ__" : 1
> Fetching value of define "__AVX512F__" : 1
> Fetching value of define "__AVX512VL__" : 1
> ...
> Run-time dependency jansson found: YES 2.11
> ...
> 
> vs
> 
> Unit tests:
> The Meson build system
> Version: 0.53.1
> ...
> C compiler for the host machine: cc (gcc 7.5.0 "cc (Ubuntu
> 7.5.0-3ubuntu1~18.04) 7.5.0")
> C linker for the host machine: cc GNU ld.bfd 2.30
> ...
> Run-time dependency libpcap found: NO (tried pkgconfig)
> Library pcap found: NO
> ...
> Fetching value of define "__AVX2__" :
> Fetching value of define "__AVX512BW__" :
> Fetching value of define "__AVX512CD__" :
> Fetching value of define "__AVX512DQ__" :
> Fetching value of define "__AVX512F__" :
> Fetching value of define "__AVX512VL__" :
> ...
> Run-time dependency jansson found: NO (tried pkgconfig and cmake)
> ...
> 
> 
> The Unit tests env does not have a AVX512 enabled toolchain, or
> something in meson disables it, hence the compilation fails and the
> unit tests are marked as failed while it has nothing to do with
> functional tests.
> 

FYI: The original release of Ubuntu 18.04 had broken AVX-512 support
in binutils. However, the fix for that issue has recently been 
backported to 18.04, so running "apt-get update && apt-get upgrade"
should fix that support.

/Bruce

PS: Yes, I'm old-skool and use apt-get rather than just "apt". I
don't like how plain apt does fancy things with the terminal for
the progress bar! 😊