Date: Sun, 28 Aug 2016 15:36:18 -0700 From: "K. Macy" <kmacy@freebsd.org> To: Matthieu Volat <mazhe@alkumuna.eu> Cc: Dimitry Andric <dim@freebsd.org>, Andrea Brancatelli <abrancatelli@schema31.it>, Kubilay Kocak <koobs@freebsd.org>, Lars Engels <lars.engels@0x20.net>, Erich Dollansky <erichsfreebsdlist@alogt.com>, Johannes Dieterich <dieterich.joh@gmail.com>, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Benchmarks results for FreeBSD 11 Message-ID: <CAHM0Q_OqYTQUX69%2BQpYxiNDws_w9XY9B%2B3Pe3PxAN6rT5-AYpA@mail.gmail.com> In-Reply-To: <CAHM0Q_MCGvfn5np7KdYq_h3cyv6w%2BVzjOMyOJzK7LYpPP6UaAA@mail.gmail.com> References: <20160819073422.4292997b@X220.alogt.com> <af0fefab-69d7-f0a9-3d6d-4a9891d5a156@FreeBSD.org> <20160821144505.27c0f55d@X220.alogt.com> <827183a944ee4052649c152d65204444@schema31.it> <20160822101423.GF18643@e-new.0x20.net> <CAHM0Q_My2otDtVSzTiQMHE=ty%2B7kEBP%2BwfFofBvOzoz8ro%2B-sQ@mail.gmail.com> <79F32FFD-BBDF-4359-A4CB-C80A3FC59EAD@FreeBSD.org> <20160828183242.759bb6c2@freedom.alkumuna.eu> <CAHM0Q_MCGvfn5np7KdYq_h3cyv6w%2BVzjOMyOJzK7LYpPP6UaAA@mail.gmail.com>
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On Sun, Aug 28, 2016 at 2:01 PM, K. Macy <kmacy@freebsd.org> wrote: >>> >> >> With 11, one can even simply install devel/openmp which will only install the libopenmp bits from llvm, and after that, base cc can do openmp. > > This isn't really useful unless the clang in base knows where to find > libomp. Considering that even the devel/llvm ports aren't configured > properly for that I don't see -fopenmp working. Without patching > makefiles or configure. So although this is better than having to > installing a complete copy of the compiler for the sake of a single > library it's still forcing FreeBSD users to jump through extra hoops > that they don't have to with gcc or on other platforms. I just tried this on Ubuntu and it looks like even there clang doesn't invoke ld correctly to make -fopenmp work. Both icc and gcc do this automatically. Thus I wonder if anyone is actually using openmp in earnest with clang. mmacy@pandemonium:~$ clang++ -fopenmp omp.cpp /usr/bin/ld: cannot find -liomp5 clang-3.5: error: linker command failed with exit code 1 (use -v to see invocation) mmacy@pandemonium:~$ clang++-3.8 -fopenmp omp.cpp /usr/bin/ld: cannot find -lomp clang: error: linker command failed with exit code 1 (use -v to see invocation) mmacy@pandemonium:~$ g++ -fopenmp omp.cpp mmacy@pandemonium:~$ g++-4.9 -fopenmp omp.cpp mmacy@pandemonium:~$ -M
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