Hi

On Fri, 24 Apr 2026 14:58:06, Drew Parsons <[email protected]> wrote:
> The mumps build failure is in the nonofficial arches
> hppa and powerpc, so broken support for them can't be considered
> a RC bug.  Hence reducing the severity of this bug to normal.

I don't think this bug is related to build failures on non-release
architectures.

I compared some of the libgmm-dev binary packages and found the
following difference:

$ diffoscope  libgmm-dev_5.5+dfsg1-1_amd64.deb libgmm-dev_5.5+dfsg1-1_s390x.deb

│ │ ├── ./usr/include/gmm/gmm_arch_config.h
│ │ │ @@ -25,11 +25,11 @@
│ │ │  /* defined if superlu header files are not under a subdirectory
called "superlu" */
│ │ │  /* #undef GMM_NO_SUPERLU_INCLUDE_SUBDIR */
│ │ │
│ │ │  /* Use blas with 64 bits integers */
│ │ │  /* #undef GMM_USE_BLAS64_INTERFACE */
│ │ │
│ │ │  /* defined if the BLAS fortran ABI does not return complex
values directly (e.g. Intel's MKL) */
│ │ │ -/* #undef GMM_BLAS_RETURN_COMPLEX_AS_ARGUMENT */
│ │ │ +#define GMM_BLAS_RETURN_COMPLEX_AS_ARGUMENT /**/
│ │ │
│ │ │  /* GMM version */
│ │ │  #define GMM_VERSION "5.5"

One solution is to simply drop the Multi-Arch: same field from the
libgmm-dev binary package (only).  See a similar bug reported against
libtrilinos-kokkos-kernels-dev  [1].

Regards
Graham


[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1133738

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