topic Re: Missing `cspr_64_` symbol in ILP64 MKL in Intel® oneAPI Math Kernel Library

Missing `cspr_64_` symbol in ILP64 MKL

ev-br — Tue, 15 Jul 2025 14:04:05 GMT

MKL 2025 installed from pypi seems to be missing the `cspr_64_` symbol with the trailing underscore:

$ nm libmkl_intel_ilp64.so |grep cspr_64 00000000002e3f80 T cspr_64 00000000002e3f80 T mkl_lapack__cspr_64_

while

$ nm libmkl_intel_ilp64.so |grep sspr_64 00000000002d1e60 T cblas_sspr_64 0000000000239d60 T sspr_64 0000000000239d60 T sspr_64_ $ nm libmkl_intel_ilp64.so |grep dspr_64 00000000002c5c70 T cblas_dspr_64 0000000000252660 T dspr_64 0000000000252660 T dspr_64_

Found it via the SciPy's pull request which aims to bring ILP64 support to SciPy, https://github.com/scipy/scipy/pull/22743/

Our current workaround is to define an env variable and

#ifdef FIX_MKL_2025_ILP64_MISSING_SYMBOL #define cspr_64_ cspr_64 #endif

Re: Missing `cspr_64_` symbol in ILP64 MKL

Fengrui — Wed, 16 Jul 2025 17:08:59 GMT

Thank you for catching this issue! I have reported it internally.

Re: Missing `cspr_64_` symbol in ILP64 MKL

ev-br — Thu, 30 Oct 2025 18:57:23 GMT

Thank you Fengrui!

Meanwhile, over at https://github.com/scipy/scipy/pull/23895 we noticed that several more symbols are missing the trailing underscore:

```

#ifdef FIX_MKL_2025_ILP64_MISSING_SYMBOL
#define cspr_64_ cspr_64
#define sgetc2_64_ sgetc2_64
#define dgetc2_64_ dgetc2_64
#define cgetc2_64_ cgetc2_64
#define zgetc2_64_ zgetc2_64
#define slasd4_64_ slasd4_64
#define dlasd4_64_ dlasd4_64
#endif

```

Re: Missing `cspr_64_` symbol in ILP64 MKL

Fengrui — Thu, 30 Oct 2025 21:06:05 GMT

These symbols were also added. The fix will be available in the 2026.0 release.

Thanks,

Fengrui

Re: Missing `cspr_64_` symbol in ILP64 MKL

ev-br — Thu, 30 Oct 2025 21:19:11 GMT

Superb, thank you. Looking forward to being able to use 2026.0 then!

Re: Missing `cspr_64_` symbol in ILP64 MKL

Fengrui — Fri, 08 May 2026 20:57:16 GMT

Thank you again for reporting this issue. The 2026.0 release is available now.