`error LNK2019: unresolved external symbol zgtcon_` under Windows

[Danvil]

I cannot get any of the backends to work under Windows.

For example using this configuration from the docs:

ndarray = { version = "0.15", features = ["blas"] }
ndarray-linalg = { version = "0.16", features = ["openblas-system"] }
blas-src = { version = "0.8", features = ["openblas"] }
openblas-src = { version = "0.10", features = ["cblas", "system"] }

Gives a whole lot of errors like this:

liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.03.rcgu.o) : error LNK2019: unresolved external symbol dgetrf_ referenced in function _ZN42_$LT$f64$u20$as$u20$lax..solve..Solve_$GT$2lu17h8cc9d17e97b9b466E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.03.rcgu.o) : error LNK2019: unresolved external symbol dgetri_ referenced in function _ZN42_$LT$f64$u20$as$u20$lax..solve..Solve_$GT$3inv17h096ce6e5710b8066E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.03.rcgu.o) : error LNK2019: unresolved external symbol dgetrs_ referenced in function _ZN42_$LT$f64$u20$as$u20$lax..solve..Solve_$GT$5solve17hb4d0f0ef88c9dd0bE
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.03.rcgu.o) : error LNK2019: unresolved external symbol sgetrf_ referenced in function _ZN42_$LT$f32$u20$as$u20$lax..solve..Solve_$GT$2lu17h3a75841395bba5e5E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.03.rcgu.o) : error LNK2019: unresolved external symbol sgetri_ referenced in function _ZN42_$LT$f32$u20$as$u20$lax..solve..Solve_$GT$3inv17hebe6cbee16776c02E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.03.rcgu.o) : error LNK2019: unresolved external symbol sgetrs_ referenced in function _ZN42_$LT$f32$u20$as$u20$lax..solve..Solve_$GT$5solve17h98dce934d429840bE
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dpotrf_ referenced in function _ZN48_$LT$f64$u20$as$u20$lax..cholesky..Cholesky_$GT$8cholesky17hbcc7fbf2610d8523E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dpotri_ referenced in function _ZN48_$LT$f64$u20$as$u20$lax..cholesky..Cholesky_$GT$12inv_cholesky17h23c7bb8ca119a2bfE
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dpotrs_ referenced in function _ZN48_$LT$f64$u20$as$u20$lax..cholesky..Cholesky_$GT$14solve_cholesky17ha567abc93f95bb69E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol spotrf_ referenced in function _ZN48_$LT$f32$u20$as$u20$lax..cholesky..Cholesky_$GT$8cholesky17ha2680083fd453484E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol spotri_ referenced in function _ZN48_$LT$f32$u20$as$u20$lax..cholesky..Cholesky_$GT$12inv_cholesky17h96252b7f76feeeb9E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol spotrs_ referenced in function _ZN48_$LT$f32$u20$as$u20$lax..cholesky..Cholesky_$GT$14solve_cholesky17h2a142dfa26637ff5E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol sgecon_ referenced in function _ZN42_$LT$f32$u20$as$u20$lax..rcond..Rcond_$GT$5rcond17h9f1fa84c873f25c2E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dgecon_ referenced in function _ZN42_$LT$f64$u20$as$u20$lax..rcond..Rcond_$GT$5rcond17hd8a6b762a0b6e628E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dsytrf_ referenced in function _ZN44_$LT$f64$u20$as$u20$lax..solveh..Solveh_$GT$2bk17he1b7c12a243d9e97E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dsytri_ referenced in function _ZN44_$LT$f64$u20$as$u20$lax..solveh..Solveh_$GT$4invh17hb63043fb21827910E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol dsytrs_ referenced in function _ZN44_$LT$f64$u20$as$u20$lax..solveh..Solveh_$GT$6solveh17h25636291622d8985E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol ssytrf_ referenced in function _ZN44_$LT$f32$u20$as$u20$lax..solveh..Solveh_$GT$2bk17h1c687d53291eda0bE
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol ssytri_ referenced in function _ZN44_$LT$f32$u20$as$u20$lax..solveh..Solveh_$GT$4invh17h35c98be9db5fc776E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.05.rcgu.o) : error LNK2019: unresolved external symbol ssytrs_ referenced in function _ZN44_$LT$f32$u20$as$u20$lax..solveh..Solveh_$GT$6solveh17h767dbd594dd51f44E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.04.rcgu.o) : error LNK2019: unresolved external symbol dlange_ referenced in function _ZN50_$LT$f64$u20$as$u20$lax..opnorm..OperatorNorm_$GT$6opnorm17haf9e9d197af3e491E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.04.rcgu.o) : error LNK2019: unresolved external symbol slange_ referenced in function _ZN50_$LT$f32$u20$as$u20$lax..opnorm..OperatorNorm_$GT$6opnorm17h0fe0ff3a25f1f35dE
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.04.rcgu.o) : error LNK2019: unresolved external symbol dtrtrs_ referenced in function _ZN52_$LT$f64$u20$as$u20$lax..triangular..Triangular_$GT$16solve_triangular17hb37784c34d361c45E
liblax-6415d9dcbfb7d3a7.rlib(lax-6415d9dcbfb7d3a7.lax.72adf86f048c75b1-cgu.04.rcgu.o) : error LNK2019: unresolved external symbol strtrs_ referenced in function _ZN52_$LT$f32$u20$as$u20$lax..triangular..Triangular_$GT$16solve_triangular17hd2a014e815dfb84fE

I have openblas installed with vcpkg and the linker command produced by cargo build contains these entries:

...
"/LIBPATH:I:\\vcpkg\\installed\\x64-windows\\lib"
"/LIBPATH:I:\\vcpkg\\installed\\x64-windows\\bin"
...
"openblas.lib"
...

[relf]

Did you try the intel-mkl-static backend? On Windows, it works for me with:

ndarray = { version = "0.15", features = ["blas"] }
ndarray-linalg = { version = "0.15", features = ["intel-mkl-static"] }

[Danvil]

It looks like these symbols are missing from the openblas.dll which vcpkg installed.

For example the linker complains about missing dgetrf_, dgetri_ and dgetrs_ and when I look at the symbols in the DLL the closest match I can find are dger_ and dger_k.

[Danvil]

I downloaded the release package from the OpenBLAS repository. The DLL compiled by vcpkg is suspiciously small (only 1.7 MB) while the DLL from the OpenBLAS repo is 50MB.

When I replaced the files produced by vcpkg with the ones from OpenBLAS the linker errors went away and my program is working.

[Danvil]

@relf It didn't work when I tried it the first time..