How to mangle symbols to have _64 suffixes for the ILP64 version of LAPACK?

[ViralBShah]

In Julia, we use _64 suffixes for the ILP64 versions of BLAS and LAPACK so that the LP64 and ILP64 libraries can be used in the same process. While we can use -DBUILD_INDEX64 with cmake to get the ILP64 version of LAPACK, we are not sure how best to mangle the symbol names to have the _64 suffixes. We use an ugly hack right now (see: https://github.com/JuliaPackaging/Yggdrasil/blob/d3913829c7ecb0e309b48065cd1ebe544c6e1bb5/L/LAPACK/common.jl#L27).

I was wondering if there is a better way to do this.

Thank you.

cc @amontoison

[amontoison]

@langou
Julien, do you have an idea how we can do that in LAPACK (and SCALAPACK)?

[ViralBShah]

Closing in favour of #666.