Problem

The bundled dxflib code emits -Wuninitialized / -Wmaybe-uninitialized warnings when compiled with -Wall:

dl_entities.h:1539:22: error: '<anonymous>.DL_HatchEdgeData::type' is used uninitialized [-Werror=uninitialized]
 1539 | struct DXFLIB_EXPORT DL_HatchEdgeData {

Triggered at dl_dxf.cpp:606 and dl_dxf.cpp:2018 where hatchEdge = DL_HatchEdgeData() default-constructs the struct. GCC flags the implicit move-assignment of uninitialized members as a potential use-before-init, even though the struct is being reset (not read).

This is a false positive in GCC's analysis — the default constructor value-initializes all members — but it fires reliably with -O3 inlining.

Current workaround

PR #369 suppresses -Wno-uninitialized and -Wno-maybe-uninitialized on the bundled dxflib source files via set_source_files_properties. This keeps -Werror working for gerbv's own code.

Upstream fix

The proper fix is in dxflib itself (QCAD): either adding a user-defined default constructor to DL_HatchEdgeData that explicitly initializes all members, or using = {} member initializers. This should be reported to https://github.com/qcad/qcad.