Santiago Andres Triana <rep...@gmail.com> writes: > Dear petsc-users, > > I am trying to install petsc with the option --with-precision=__float128. > The ./configure goes fine, as well as the make all stage. However, the make > check step to test the libraries fails with the following error: > > /usr/bin/ld: home/spin/petsc-3.9.3/arch-linux2-c-opt/lib/libpetsc.so: > undefined reference to `dgemv_'
Please send complete configure.log and make.log. Possibly fighting between f2cblaslapack and Fortran kernels. > > this is the configure command I use: > > ./configure --with-scalar-type=complex --with-precision=__float128 > --with-debugging=0 --with-fortran-kernels=1 COPTFLAGS='-O3 -march=native > -mtune=native' CXXOPTFLAGS='-O3 -march=native -mtune=native' FOPTFLAGS='-O3 > -march=native -mtune=native' --download-f2cblaslapack Note that -mtune=native above is redundant -- you only need to specify it explicitly if you want to tune to a more restrictive class of processors. For example -march=sandybridge -mtune=skylake would not use AVX2/FMA instructions, but would optimize code on the assumption of an extra load/store unit (present in Haswell and Skylake; may mean more cycles waiting on load/store when run on Sandy Bridge).
