Can't build custom MKL on Linux, prof edition 11.1

[gary-oberbrunner]

I get the following error when building a custom MKL on Linux (RedHat 4) with compiler Professional Edition 11.1.064. The makefile seems to be missing a -L directive to find libiomp5. Any suggestions?

[bash]
% make em64t name=foo_mkl
export LIBRARY_PATH=:; \
gcc -shared -Bdynamic \
 -u dgemm_ -u ddot_ -u dgetrf_ \
-Wl,--start-group \
"/opt/intel/Compiler/11.1/064/mkl//lib/em64t/libmkl_intel_lp64.a" \
"/opt/intel/Compiler/11.1/064/mkl//lib/em64t/libmkl_intel_thread.a" \
"/opt/intel/Compiler/11.1/064/mkl//lib/em64t/libmkl_core.a" \
-Wl,--end-group \
-L"/opt/intel/Compiler/11.1/064/mkl//lib/em64t" -liomp5 -lm \
-o "foo_mkl.so"
/usr/bin/ld: cannot find -liomp5
collect2: ld returned 1 exit status
make: *** [em64t] Error 1
[/bash]

This patch fixes it for me:

[bash][garyo@smoke4-64 builder]$ diff -u makefile.~1~ makefile
--- makefile.~1~        2009-11-19 08:19:15.000000000 -0500
+++ makefile    2010-02-04 09:33:35.000000000 -0500
@@ -78,6 +78,9 @@
 mklem64t_libpath=$(MKLROOT)/lib/em64t
 mkl64_libpath=$(MKLROOT)/lib/64

+iomp5_ia32_libpath=$(MKLROOT)/../lib/ia32
+iomp5_em64t_libpath=$(MKLROOT)/../lib/intel64
+
 ##------------------------------------------------------------------------------
 ## No changes below this line !
 ##------------------------------------------------------------------------------
@@ -136,7 +139,7 @@
        "$(mkl32_libpath)/$(THREADING_LIB)" \
        "$(mkl32_libpath)/$(CORE_LIB)" \
        -Wl,--end-group \
-       -L"$(mkl32_libpath)" $(OMP_LIB) $(LIBM) \
+       -L"$(mkl32_libpath)" -L"$(iomp5_ia32_libpath)" $(OMP_LIB) $(LIBM) \
        -o "$(name).so"

 em64t:
@@ -148,7 +151,7 @@
        "$(mklem64t_libpath)/$(THREADING_LIB)" \
        "$(mklem64t_libpath)/$(CORE_LIB)" \
        -Wl,--end-group \
-       -L"$(mklem64t_libpath)" $(OMP_LIB) $(LIBM) \
+       -L"$(mklem64t_libpath)" -L"$(iomp5_em64t_libpath)" $(OMP_LIB) $(LIBM) \
        -o "$(name).so"

 ipf ia64:
[/bash]

[Gennady_F_Intel]

The makefile seems to be missing a -L directive to find libiomp5. Any suggestions?

The openmp threading library "libiomp5" is located into Compiler's directory ( for example see into ../Compiler/11.1/064/lib/intel64" folder for 64 bit version ).So, you have to set paths to this folder.

the best way to do that - to launch "iccvars.sh intel64" from../Compiler/11.1/064/bin folder.

The reason why libiomp has been stored into another place ( if we look at the stanalone version on MKL we can find libiom5* binaries into /lib/em64t ) is that all CPE components like IPP, MKL and compiler itself are using this library.

So there are no sense to have several duplicates

--Gennady

[gary-oberbrunner]

I wasn't suggesting duplicating it, that would make no sense (as you say). Just that the makefile should contain the correct path to wherever libiomp5.so is. Making users run a shell script just makes it harder to do a custom build. Anyway, I submitted a patch to the makefile, you can use it if you want.