METIS fork

This is a fork of the METIS graph partitioning software from the Karypis group. The current version of the forked source code is 5.1.0. The fork is intended to provide a stable location for source code used by APBS and other software packages that depend on METIS.

Graph and mesh reader regression tests

Configure the root project with -DMETIS_BUILD_TESTS=ON and an absolute -DGKLIB_PATH to enable the reader CTest suite. The graph and mesh reader workflow runs it with AddressSanitizer and UndefinedBehaviorSanitizer for both 32-bit and 64-bit METIS indices.

Readers reject invalid header counts and weights before using them for allocation or indexing. Mesh files with multiple balancing constraints are rejected during reading, rather than after reading by mpmetis; those constraints remain unsupported.

PDB parser regression tests

Build the standalone GKlib tests with AddressSanitizer and UndefinedBehaviorSanitizer:

cmake -S GKlib -B build-parser \
  -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
  -DCMAKE_C_FLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer -g" \
  -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=address,undefined"
cmake --build build-parser --target pdb_parser --parallel 2
ctest --test-dir build-parser --output-on-failure

The tests cover valid ATOM records, malformed record names, truncated fields, and empty input. Both parsing passes bound record-name extraction and reject malformed ATOM records through GKlib's error handler. If error termination is disabled, the reader returns NULL after reporting the error. HETATM handling is unchanged.