> 1) We provide extra shared objects, libopenblasp, libopenblaso, etc > and let R link against libopenblaso (o=openmp) > > Drawback: too ugly and makes the blas ecosystem overly complex. > Also breaks the alternative mechanism > > 2) Add RPATH=/usr/lib/<..>/blas-pthread/ to all the corresponding > ELFs of R. > > Drawback: ELFs of external packages might be linked against > libblas.so.3 without RPATH. > > 3) ...
3) export LD_PRELOAD=/usr/lib/<..>/blas-pthread/ in the /usr/bin/R script. This may look ungraceful, but if /usr/bin/R is the only entrance for normal R users, this LD_PRELOAD var may help override the libblas.so.3 required by all the ELF binaries. For us the BLAS/LAPACK maintainers, creating the following new alternative groups should be relatively easy: * /usr/lib/<triplet>/blas-pthread/libblas.so.3: candidates are + libopenblas0-pthread + libblis3-pthread ... + netlib (fallback) * /usr/lib/<triplet>/blas-openmp/libblas.so.3: canddiates are + libopenblas0-openmp + libblis3-openmp ... + netlib (fallback) * /usr/lib/<triplet>/blas-serial/libblas.so.3: candidates are + libopenblas0-serial + libblis3-serial ... + netlib (fallback) Because we won't have to build new shared objects, or to introduce new SONAMEs.
