[Debichem-devel] Bug#1150537: madness: FTBFS: unrecognized argument to '-flto=' option

[Viktor Pashaiev]

Package: madness
Version: 0.10.1+git20200818.eee5fd9f-4
Severity: important
Tags: patch ftbfs
User: ubuntu-devel at lists.ubuntu.com
Usertags: origin-ubuntu stonking

Dear Maintainer,

madness fails to build from source on Ubuntu 26.10:

cc1plus: error: unrecognized argument to '-flto=' option: 'auto -ffat-lto-objects'

Root cause:
MPI_COMPILE_FLAGS returned by CMake FindMPI contains space-delimited flags leaked by mpich wrappers. In src/madness/CMakeLists.txt, passing quoted "${MPI_COMPILE_FLAGS}" without separate_arguments() causes CMake to pass all flags as a single compiler argument to g++.

Fix:
Split MPI_COMPILE_FLAGS using separate_arguments() in external/mpi.cmake and remove quotes in target_compile_options() in src/madness/CMakeLists.txt.

The patch is attached.

Best regards,
Viktor Pashaiev
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