Undefined Symbols error calling LAPACK subroutines

[carless]

Hi,

I just started using the MKL for MAc OS X. I cannot link and I get an Undefined Symbols error when I try to call a LAPACK subroutine. I would very much appreciate some help.

I use the following software:

XCode v.3.1.1

Mac OS X v. 10.5.4

Intel Fortran Compiler v.10.1



In the main code I have the commands:



USE mkl95_PRECISION, ONLY: WP => SP

USE mkl95_LAPACK, ONLY: gttrf,gttrs



and



call cgttrf(ifou_r, dl, dd, du, du2, ipiv, info1)

call cgttrs(N, ifou_r, 1, dl, dd, du, du2, ipiv, BB, ifou_r, info2)



The compilation command reads:



ifort -O4 /Library/Frameworks/Intel_MKL.framework/Versions/10.0.3.020/include/mkl_lapack.f90 -o HHP HH_P.f90 -L/Library/Frameworks/Intel_MKL.framework/Versions/10.0.3.020/lib/em64t -I/Library/Frameworks/Intel_MKL.framework/Versions/10.0.3.020/include -lmkl_lapack -lmkl_intel_thread -lmkl_core -lguide -lpthread



I always get the following error:



Undefined symbols:

"_cgttrf_", referenced from:

_MAIN__ in ifortMrPnMw.o

"_cgttrs_", referenced from:

_MAIN__ in ifortMrPnMw.o

ld: symbol(s) not found



Thank you,

Carles

[Todd_R_Intel]

Quoting - carless

ifort -O4 /Library/Frameworks/Intel_MKL.framework/Versions/10.0.3.020/include/mkl_lapack.f90 -o HHP HH_P.f90 -L/Library/Frameworks/Intel_MKL.framework/Versions/10.0.3.020/lib/em64t -I/Library/Frameworks/Intel_MKL.framework/Versions/10.0.3.020/include -lmkl_lapack -lmkl_intel_thread -lmkl_core -lguide -lpthread

Try adding -lmkl_intel_lp64 before "-lmkl_lapack" in your build command above.libmkl_intel_lp64.dylib is the interface library which is always necessary in addition to the threading layer ("-lmkl_intel_thread" above) and computation layer ("-lmkl_core" above). Chapter 5 in the User Guide in your doc directory goes into some detail about this.

-Todd

[carless]

Quoting - Todd Rosenquist (Intel)

Thank you so much for your assistance. The point is that I just saw that the Fortran 90 interface, which I need, had to be built by hand, and I just tryied it with no success however. To use the library that you suggest I should be able to build the em64t Fortran 90 interface, but maybe there is a bug in the software, since it gives me an error. If you would be so kind to read my next contribution to the forum it would certainly be a great help, I explain the problem there. Best, Carles