Using ifx fortran compiler from Intel 2024 oneapi gives errors during configure step

[feacluster]

I can successfully build arpack-ng with blas and lapack using this comand:

 CXX=icx CC=icx FC=ifort F77=ifort ./configure --with-blas=/home/feacluster/OpenBLAS/build/lib/libopenblas_sapphirerapids-r0.3.27.dev.a --with-lapack=/home/feacluster/OpenBLAS/build/lib/libopenblas_sapphirerapids-r0.3.27.dev.a --enable-icb --enable-static --disable-shared --prefix=/home/feacluster/arpack-ng/build

But if I replace ifort with ifx I get:

checking for dummy main to link with Fortran 77 libraries... unknown
configure: error: in `/home/feacluster/arpack-ng':
configure: error: linking to Fortran libraries from C fails
See `config.log' for more details

The config.log shows this error:

configure:5784: icx -o conftest -O2   conftest.c   -loopopt=1 -L/opt/intel/oneapi/tbb/2021.12/env/../lib/intel64/gcc4.8 -L/opt/intel/oneapi/m>
/usr/bin/ld: cannot find -loopopt=1
icx: error: linker command failed with exit code 1 (use -v to see invocation)
configure:5784: $? = 1
configure: failed program was:

Next if I try and just omit the F77=ifx, with:

INTERFACE64="1" CXX=icx CC=icx FC=ifx  ./configure --with-blas=/home/feacluster/OpenBLAS/build/lib/libopenblas_sapphirerapids-r0.3.27.dev.a --with-lapack=/home/feacluster/OpenBLAS/build/lib/libopenblas_sapphirerapids-r0.3.27.dev.a --enable-icb --enable-static --disable-shared --prefix=/home/feacluster/arpack-ng/build

I get:

checking for sgemm_ in /home/feacluster/OpenBLAS/build/lib/libopenblas_sapphirerapids-r0.3.27.dev.a... yes
checking for cheev_ in /home/feacluster/OpenBLAS/build/lib/libopenblas_sapphirerapids-r0.3.27.dev.a... no
checking for cheev_... no
checking for cheev_ in -llapack... no
checking for cheev_ in -llapack_rs6k... no
configure: error: cannot find LAPACK libraries

Which is strange because it finds it ok with I use ifort instead of ifx. The library is in the same folder as where I am running config.

[fghoussen]

Does ifx implements the Fortran 2003 standard that defines ICB?
Did you try without ICB? (no Fortran standard required)
Did you try with `cmake?

[feacluster]

Thanks for the quick reply! From AI answers:

Yes, the Intel Fortran Compiler (ifx) implements Fortran 2003, but not parameterized derived types.

I tried without ICB but got the same error. The strange thing is cheeve_ does seem to be in the openblas library:

checking for sgemm_ in /home/feacluster/OpenBLAS/build/lib/libopenblas.a... yes
checking for cheev_ in /home/feacluster/OpenBLAS/build/lib/libopenblas.a... no
checking for cheev_... no
checking for cheev_ in -llapack... no
checking for cheev_ in -llapack_rs6k... no
configure: error: cannot find LAPACK libraries
[feacluster@intel arpack-ng]$ strings /home/feacluster/OpenBLAS/build/lib/libopenblas.a | grep cheev_
cheev_
cheev_2stage_
LAPACKE_cheev_work
LAPACKE_cheev_2stage
LAPACKE_cheev_2stage_work
lapacke_cheev_work.o/
lapacke_cheev_2stage.o/
lapacke_cheev_2stage_work.o/
cheev_

[fghoussen]

Have you double-checked these the following things? If so, you'll need support from Intel, not from here.

Using ifx fortran compiler from Intel 2024 oneapi

OneAPI = new name for MKL: https://github.com/opencollab/arpack-ng?tab=readme-ov-file#using-mkl-instead-of-blas--lapack

Did you make sure the build system you use end up exactly with what's Intel libraries expect: https://www.intel.com/content/www/us/en/developer/tools/oneapi/onemkl-link-line-advisor.html#gs.8i3omj

Example:

arpack-ng/.github/workflows/jobs.yml

Lines 156 to 163 in 4caa8f4

	./configure --enable-icb --with-blas=mkl_gf_ilp64 --with-lapack=mkl_gf_ilp64
	make all
	make check
	env:
	FFLAGS: "-DMKL_ILP64 -I/usr/include/mkl"
	FCFLAGS: "-DMKL_ILP64 -I/usr/include/mkl"
	LIBS: "-Wl,--no-as-needed -L/usr/lib/x86_64-linux-gnu -lmkl_sequential -lmkl_core -lpthread -lm -ldl"
	INTERFACE64: "1"

INTERFACE64="1" ... ./configure ...
strange thing is cheeve_ does seem to be in the openblas

arpack-ng/README.md

Line 45 in 4caa8f4

- As this can not be automated, you need to make sure that the BLAS/LAPACK libraries you pass to `arpack-ng`:

#452 (comment)

[Fabian188]

I need only the lib, no tests and examples and I patched arpack not to search for blas (here MKL) in that case.

Then arpack compiles without issues for me with ifx on Linux (2025.0) and Windows (2024)