Adding LIBRARIES failed with lapack and blas

[APTX-4869-core]

Grettings!

The amrex seems not to have more class about Matrix operation.
I want to do some matrix operation in every time step, such as inversion.

So, I tried to add the LAPACK and BLAS library in both the IAMR/Source/Utilities/Make.package and IAMR/Exec/Make.IAMR as follows :

/****************************************************
INCLUDE_LOCATIONS += /home/lapack-3.11/BLAS/include
LIBRARY_LOCATIONS += /usr/lib/x86_64-linux-gnu
LIBRARIES += -lblas

INCLUDE_LOCATIONS += /home/lapack-3.11/LAPACK/include
LIBRARY_LOCATIONS += /usr/lib/x86_64-linux-gnu/lib
LIBRARIES += -llapack
/****************************************************

but it always reported that :

/****************************************************
/usr/bin/ld: tmp_build_dir/o/2d.gnu.DEBUG.TPROF.MPI.EXE/LAPACKMatrix.o: in function multiply(LAPACKMatrix&, LAPACKMatrix const&, LAPACKMatrix const&)': /home/AMReX/IAMR/Tutorials/flowPastCylinder/../../Source/Utilities/LAPACKMatrix.cpp:375: undefined reference to dgemm'
collect2: error: ld returned 1 exit status
make: *** [../../../amrex/Tools/GNUMake/Make.rules:64: amr2d.gnu.DEBUG.TPROF.MPI.ex] Error 1
/****************************************************

The LAPACKMatrix.cpp contains the interface for calling the lapack function, and the dgemm should be a function in the BLAS library, called in the LAPACKMatrix.cpp. It seems that the compiler didn't find the library and includes. Is the way or the position I adding the flags wrong? I'm sure the static library is located in the right way as above.

Thanks in advance!

Regards,
Arashi

[WeiqunZhang]

Please take a look at https://amrex-codes.github.io/amrex/docs_html/BuildingAMReX.html#tweaking-the-make-system. Here is the last paragraph of that section.

To link to an additional library say ``foo`` with headers located at
``foopath/include`` and library at ``foopath/lib``, you can add the
following to your make file before the line that includes AMReX's
``Make.defs``,

::

        INCLUDE_LOCATIONS += foopath/include                                                                                                                                               
        LIBRARY_LOCATIONS += foopath/lib                                                                                                                                                   
        LIBRARIES += -lfoo

Please note the last sentence, before the line that includes AMReX's Make.defs.

If it still does not work, let us know.

[APTX-4869-core]

Thanks for your instruction! It can find the library and includes now! Still there's some problems left, but it's about the usage of this library under the AMReX frame. I think I can make it. I'm closing this question and thank you again!