Spglib v0.6 dependency prevents coexistence with Spglib v1.x packages #85

Problem

BrillouinZoneMeshes.jl is pinned to Spglib = "0.6.0" and cannot coexist in the same environment with packages that require Spglib v1.x (e.g., DFTK.jl, BoltzTraP.jl).

Julia's Pkg does not support loading multiple versions of the same package in a single environment, so any project using Spglib v1.x is unable to use BrillouinZoneMeshes.jl.

Root Cause

• Project.toml compat is pinned to Spglib = "0.6.0"
• Direct dependency on spglib_jll with 5 ccall invocations to C functions (spg_get_symmetry, spg_get_symmetry_with_collinear_spin, spg_get_stabilized_reciprocal_mesh,
  spg_get_error_code, spg_get_error_message)
• Spglib.jl high-level API is also used (Cell, standardize_cell, get_spacegroup_number), and type names, field names, and function signatures have changed between v0.6
  and v1.x
• A compat bump alone is insufficient; code changes are required

Scope of Impact

• Public API of BrillouinZoneMeshes.jl (function signatures) is not affected
• Spglib-derived struct field names have changed (e.g., .types → .atoms)
• Downstream packages (GreenFunc.jl, etc.) do not directly access Spglib return value fields; the impact is contained within BrillouinZoneMeshes.jl internals

Proposed Fix

A working implementation is available at https://github.com/hsugawa8651/BrillouinZoneMeshes.jl/tree/spglib-v1x-compat

All Spglib-related tests pass. Will submit a PR shortly.

Related

• Spglib.jl v1.x: https://github.com/singularitti/Spglib.jl
• Julia 1.10+ compatibility and DFTK.jl dependency conflict GreenFunc.jl#114 (dependency conflict with DFTK.jl)