You can check 'ifort -v test.F' - to see how its using gcc internally. configure.log will have the details on where the path is coming from. [you can send us this log] PETSc configure attempts to determine the compiler libraries - and this part could show up with some paths that are not needed. Workaround is to manually specify these paths to petsc configure - so that it doesn't try to determine from 'ifort -v' - and pick up unneed stuff. ./configure LIBS=/path_to/libifcore.a [but then ifort changes this from libifcore.a to libifcoremt.a - if openmp is enabled] Satish On Tue, 23 Oct 2018, Hector E Barrios Molano wrote:

Thank you Satish for your response,

Yes I am intended to use ifort with gcc.

I changed ifort versions to one that does not include tbb.

However, PETSc is still including -L/usr/lib/gcc/x86_64-redhat-linux/4.1.2 in petscvariables, attached you will find an updated petscvariables file.

ifort is not including any gcc, neither there is reference to this directory in $PATH or $LD_LIBRARY_PATH, why is PETSc still including it?

Thanks for your help,

Hector

On 10/18/18 5:28 PM, Balay, Satish wrote:

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-L/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/tbb/lib/intel64/gcc4.1 -L/usr/lib/gcc/x86_64-redhat-linux/4.1.2 Its likely the gcc-4.1 stuff is coming from ifort.

Did you intend to use ifort with gcc? [instead of gfortran?]

Satish

On Thu, 18 Oct 2018, Hector E Barrios Molano wrote:

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Hi PETSc Experts!

I am building PETSc from the git repository and it is strange that once PETSc is installed the petscvariables (PETSC_WITH_EXTERNAL_LIB) file shows a different gcc library path that the one from the compiler used and the one defined in LD_LIBRARY_PATH. This is causing me troubles when using PETSc with other library that requires libstdc++

Here is the command used to build PETSc: ./configure --prefix=$DEV_lib_dir/petsc_git-debug --PETSC_DIR=/home/hector/dwnld_prog/petsc --PETSC_ARCH=linux-intel-debug --CC=mpicc --FC=mpifort --CXX=mpicxx --with-openmp=1 --with-valgrind=1 --with-valgri nd-dir=/home/hector/installed --with-parmetis-dir=$DEV_lib_dir/parmetis/ --with-metis-dir=$DEV_lib_dir/parmetis/ --with-zoltan-dir=$DEV_lib_dir/zoltan/ --with-hypre-dir=$DEV_lib_dir/hypre --download-ptscotch --with-blas-lapack-lib=\[${MKLR OOT}/lib/intel64/libmkl_intel_lp64.a,${MKLROOT}/lib/intel64/libmkl_core.a,${MKLROOT}/lib/intel64/libmkl_intel_thread.a\] --with-scalapack-include=${MKLROOT}/include --with-scalapack-lib=\[${MKLROOT}/lib/intel64/libmkl_scalapack_lp64.a,${MK LROOT}/lib/intel64/libmkl_blacs_intelmpi_lp64.a\] --with-shared-libraries=0 --FC_LINKER_FLAGS="-qopenmp -qopenmp-link static" --FFLAGS="-qopenmp -qopenmp-link static" --LIBS="-Wl,--start-group ${MKLROOT}/lib/intel64/libmkl_intel_lp64.a ${M KLROOT}/lib/intel64/libmkl_core.a ${MKLROOT}/lib/intel64/libmkl_intel_thread.a -Wl,--end-group -liomp5 -ldl -lpthread -lm"

Here is LD_LIBRARY_PATH: echo $LD_LIBRARY_PATH /home/hector/installed/gcc-6.1/lib64:/home/hector/installed/gcc-5.1/lib64://home/hector/installed/lib:/home/hector/installed/libraries_intel/openmpi/lib:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/compiler/lib/intel64:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/compiler/lib/intel64_lin:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/mpi/intel64/lib:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/mpi/mic/lib:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/ipp/lib/intel64:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/compiler/lib/intel64:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/mkl/lib/intel64:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/tbb/lib/intel64/gcc4.1:/share/apps/intel3/debugger_2016/libipt/intel64/lib:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/daal/lib/intel64_lin:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/daal/../tbb /li b/intel64_lin/gcc4.4:/share/apps/intel3/compilers_and_libraries_2016.2.181/linux/daal/../compiler/lib/intel64_lin:/home/hector/installed/gcc-6.1/lib64:/home/hector/installed/gcc-5.1/lib64://home/hector/installed/lib:/home/hector/installed/gcc-6.1/lib64:/home/hector/installed/gcc-5.1/lib64://home/hector/installed/lib:/opt/gridengine/lib/lx26-amd64:/opt/openmpi/lib

Attached you will find the resulting petscvariables file. There in the definition of PETSC_WITH_EXTERNAL_LIB it is not included the gcc-6.1 directory and instead gcc4.1 directory is included.

What could be the problem? Thank you for your help.

Best regards,

Hector