Package: openblas Version: 0.2.19-3 Severity: wishlist Dear Maintainer,
OpenBLAS in version 0.2.19-3 currently installed on Debian Stretch as well as the version 0.2.20+ds-4 in Testing declares the cblas_*() as taking double* instead of void* for complex values. As an example, it declares cblas_zdscal as void cblas_zdscal(OPENBLAS_CONST blasint N, OPENBLAS_CONST double alpha, double *X, OPENBLAS_CONST blasint incX); This function takes an array of complex numbers X and scales them by the real value alpha. In contrast to this, all other packages in Debian as well as the Intel MKL define cblas_zdscal as taking a void* for X, i.e.: void cblas_zdscal(const int N, const double alpha, void *X, const int incX); See e.g. https://codesearch.debian.net/search?q=cblas_zdscal&perpkg=1 or https://software.intel.com/en-us/mkl-developer-reference-c-cblas-scal or http://www.netlib.org/blas/cblas.h The same difference applies to the cblas_zscal() function and all others: $ dpkg -S /usr/include/cblas.h; dpkg -S /usr/include/openblas/cblas.h; grep zscal /usr/include/openblas/cblas.h /usr/include/cblas.h libblas-dev: /usr/include/cblas.h libopenblas-dev: /usr/include/openblas/cblas.h /usr/include/openblas/cblas.h:void cblas_zscal(OPENBLAS_CONST blasint N, OPENBLAS_CONST double *alpha, double *X, OPENBLAS_CONST blasint incX); /usr/include/cblas.h:void cblas_zscal(const int N, const void *alpha, void *X, const int incX); I have only noticed the issue now as cblas.h has become part of the alternatives system and is currently directing to the OpenBLAS version in testing. In Stretch, if also libblas-dev is installed, its cblas.h is used and the difference hence hidden away. I suspect that this problem is not more widespread because people tend to cast their arguments to (void*) explicitly, but the conversion std::complex<double>* => void* => double* is probably actually undefined… There was also some discussion in 2013, but it seemed to go nowhere: http://comments.gmane.org/gmane.comp.lib.openblas.general/192 I would be very thankful if there was some way to avoid the explicit casts to (void*) in calls specifically for OpenBLAS. Best wishes, Claudius --- System information. --- Architecture: Kernel: Linux 4.9.0-3-amd64 Debian Release: 9.1 990 stable security.debian.org 990 stable ftp.de.debian.org 500 unstable ftp.de.debian.org 500 stable repo.skype.com --- Package information. --- Package's Depends field is empty. Package's Recommends field is empty. Package's Suggests field is empty.
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