topic You have two mistakes. in Intel® oneAPI Math Kernel Library

f90 compiling/linking to MKL library - syev routine

mzp — Wed, 12 Sep 2018 16:15:54 GMT

Hello,

I am trying to link my code to syev LAPACK 95 routine and cannot compile it can you help with I am missing?

The code with compile ok with ssyev but is more convenient to use f95 interfaces

Thanks,

ifort -O3 -mkl=sequential test.f90 test.x

...

real :: corr(5,5), eval(5)

...

CALL syev(corr,eval,'V')

PRINT *,eval

...

/tmp/ifortGvqotk.o: In function `MAIN__':
test.f90:(.text+0x411f): undefined reference to `syev_'

You have two mistakes.

mecej4 — Thu, 13 Sep 2018 01:01:56 GMT

You have two mistakes.

1. You called the generic subroutine syev(), which takes optional arguments as well, without providing an interface. You can correct this by inserting the statement use lapack95 in the caller(s). See the section "Fortran 95 Interface Conventions for LAPACK Routines" in the MKL Reference (Fortran).

2. You should specify that the linker should use the Lapack95 library. To find the list of libraries to use, you may use the MKL Link Line Advisor, https://software.intel.com/sites/products/mkl/mkl_link_line_advisor.htm .

you may also take a look at

Gennady_F_Intel — Thu, 13 Sep 2018 03:33:12 GMT

you may also take a look at the syev.f90 example and you will see all needed to build and run. you may find out this example into mklroot\examples\lapack95\source folder

Thanks, the code will compile

mzp — Thu, 13 Sep 2018 18:41:17 GMT

Thanks, the code will compile with

mpiifort -O2 test.f90 -mkl=parallel -o test.x -lmkl_lapack95_lp64

ifort -O2 test.f90 -mkl=sequential -o test.x -lmkl_lapack95_lp64

and insert use lapack95 in the main block

Many thanks for helping!