https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896954#M10942 I thought I did switch to the em64t libs: mkl_em64t.lib. It still gives unresolved external reference.<BR /> Thu, 01 Nov 2007 19:41:32 GMT lel4866 2007-11-01T19:41:32Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896952#M10940 When I compile the example code (calling zdotc) under Visual Studio 2005 using ia32 (specifiying mkl_c.lib as an Additional Dependency for the Linker), everything works fine and executes properly.<BR /><BR />However, taking the same source code and specifying mkl_em64t_lib as an Additional Dependency for the Linker, I get:<BR /><BR />error LNK2019: unresolved external symbol _zdotc referened in function _main<BR /><BR />Same if I replace the call to zdotc with cbals_ddot (with appropriate source code changes).<BR /><BR />Any suggestions?<BR /><BR />Thanks.<BR /><BR />Larry Lewis<BR /> Thu, 01 Nov 2007 17:10:06 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896952#M10940 lel4866 2007-11-01T17:10:06Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896953#M10941 You need the em64t MKL libraries equivalent to those you used for the 32-bit build. If you are building both 32- and 64-bit on the same platform, I guess you could have difficulty if you depend on a default PATH setting which you may have selected when installing MKL. <BR /> Thu, 01 Nov 2007 18:57:02 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896953#M10941 TimP 2007-11-01T18:57:02Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896954#M10942 I thought I did switch to the em64t libs: mkl_em64t.lib. It still gives unresolved external reference.<BR /> Thu, 01 Nov 2007 19:41:32 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896954#M10942 lel4866 2007-11-01T19:41:32Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896955#M10943 Also, I did a dumpbin of the two libs: 1ia32mkl_c.lib and em64tmkl_em64t.lib. ia32mkl_c.lib has virtually all of its defined symbols starting with a preceeding _, while em64tmkl_em64t.lib has none of it's symbols define with a preceeding underscore.<BR /><BR />My guess is that this is the problem, but I don't know what caused it or how to get around it.<BR /> Thu, 01 Nov 2007 20:18:54 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896955#M10943 lel4866 2007-11-01T20:18:54Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896956#M10944 <P>Could you tell us that version of MKL are you using?</P> Tue, 06 Nov 2007 15:50:58 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896956#M10944 Andrey_G_Intel2 2007-11-06T15:50:58Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896957#M10945 I've tried both 9.1.027 and 10.0.006, but here's the solution (at least for 10.0.006):<BR /><BR />1. You have to install the Visual Studio 2005 64-bit compilers (I hadn't)<BR />2. You have to use the Configuration Manager in VS 2005 to set the Platform to x64<BR /> Wed, 07 Nov 2007 17:03:34 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/unresolved-references-with-em64t-ok-with-ia32/m-p/896957#M10945 lel4866 2007-11-07T17:03:34Z