[ViralBShah]

Loads all SuiteSparse libraries through SuiteSparse_jll, the same way SparseArrays.jl does, and updates the wrapper generator to Clang.jl 0.19.

Loading libraries from the JLL

KLU.jl declared SuiteSparse_jll as a dependency, but nothing in src/ loaded it. It set const libklu = :libklu and left the library to be found by name. src/wrappers.jl also refers to libsuitesparseconfig, libbtf and libamd, which weren't defined anywhere in the module, so calling those wrappers threw UndefVarError. For example, KLU.SuiteSparse_config_malloc_func_get() did.

With using SuiteSparse_jll, all of these names come from the JLL, and src/, test/ and docs/make.jl no longer contain a literal library name. gen/generator.toml still has to spell out the binding names for Clang.jl, so the generator now asserts that each one is a binding of SuiteSparse_jll.

On Linux with Julia 1.13, main already loads the same file as Julia's own copy, lib/julia/libklu.so.2, so I don't expect a change there. What this adds is that KLU.jl no longer depends on that lookup finding the right file, which could differ on Windows, where a bare name goes through DLL search rules. I haven't shown that a wrong DLL has ever been loaded, so this isn't a known fix for #38.

Generator and wrappers

• Clang.jl: 0.17 to 0.19.
• Header path: the headers moved to include/suitesparse, so the generator failed before this.
• colamd_* wrappers: these now use libcolamd. They pointed at libamd because colamd.h wasn't mapped.
• Ignore list: adds SUITESPARSE_TIME and SUITESPARSE_CONFIG_TIMER, which would otherwise call C at load time or refer to an undefined name.

src/wrappers.jl is regenerated from SuiteSparse 7.10.1, with these effects:

• Struct fields: no field changed from the previous wrappers, so the layouts match on the versions this package supports back to 7.2.
• Mutability: klu_symbolic, klu_l_symbolic, klu_numeric and klu_l_numeric became immutable. KLU.jl only reads them through unsafe_load.
• New wrappers: adds klu_version, amd_version, btf_version and colamd_version. These may not exist in older SuiteSparse versions, so they could fail if called on those. Nothing in KLU.jl calls them.
• Version constants: they now report 7.10.1 whichever version is loaded, as they reported the previous version before. Nothing in KLU.jl's source uses them.

Generating for x86_64-w64-mingw32 and x86_64-linux-gnu gives byte-identical output, so one set of wrappers is correct for both. That rules out a difference in the generated bindings as a cause of the Windows reports.

Codecov

Adds codecov.yml, which excludes gen and src/wrappers.jl. The wrappers are generated, and most of them are never called, which held the project figure at about 52%. src/KLU.jl alone was at 95.8% when last measured, so expect the reported figure to jump. That's the change in what's counted, not new tests.

Testing

Two additions are folded into the existing "KLU Wrappers" testset: all five libraries are identical to the JLL's, and a libsuitesparseconfig wrapper is callable. The latter threw UndefVarError on main.

The full suite passes locally on Linux with Julia 1.10, 1.11, 1.12 and 1.13 at -t 2. Aqua and the docs build also pass. Windows has only been run through CI.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.54%. Comparing base (1c872bf) to head (2458624).

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #55       +/-   ##
===========================================
+ Coverage   73.17%   97.54%   +24.37%     
===========================================
  Files           2        1        -1     
  Lines         630      367      -263     
===========================================
- Hits          461      358      -103     
+ Misses        169        9      -160     

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