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pcbjam/docs/features/fork-cleanup/08-importers.md
Viktor Vaczi bfe4ae8be9 Kicad fork cleanup docs.
2026-06-15 11:32:12 +02:00

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08 — Re-enable file-format importers

Verdict: re-enable now. The exclusions are stale or incidental, not technical. The Altium blocker was fixed months ago (the fix is already force-included into every TU), and the other five eeschema importers were cut for "MVP scoping" while their parsers compile for wasm anyway. Re-enabling is net-negative diff — it deletes fork gates. Configure- confident but runtime-untested: smoke-test each with a sample file before declaring done.

Altium (eeschema + pcbnew) — the blocker is already fixed

The recorded blocker was real: thirdparty/compoundfilereader/compoundfilereader.h:264 does typedef std::basic_string<uint16_t> utf16string;, and the libc++ shipped in Emscripten 4.0.2 removed the generic std::char_traits base template (deprecated LLVM 18, removed LLVM 19 via llvm/llvm-project#72694 — the same break hit nlohmann/json #4490, qpdf #1024). Plain std::basic_string<uint16_t> fails to compile with implicit instantiation of undefined template 'std::char_traits<unsigned short>'.

The fix already exists and is already active. wasm/stubs/char_traits_uint16_workaround.h defines std::char_traits<unsigned short> and is force-included into every KiCad TU via -include in CMAKE_CXX_FLAGS (scripts/kicad/build-kicad-target.sh:343). A standalone compile test with the project's own emsdk confirms compoundfilereader.h compiles clean with the specialization in scope. (Upstream KiCad hit the identical bug on Apple clang ≥17 and ships the same specialization gated #ifdef __APPLE__ in the vendored header.) No other basic_string<unsigned short> use exists anywhere in the tree outside this header.

So the Altium exclusions are simply stale. Remove these fork-added gates (each removal reduces the diff):

common/CMakeLists.txt              # io/altium 4 files gated NOT EMSCRIPTEN
eeschema/CMakeLists.txt            # importer block; altium lines
eeschema/sch_io/sch_io_mgr.cpp     # #ifndef __EMSCRIPTEN__ includes + factory cases
pcbnew/CMakeLists.txt              # add_subdirectory(pcb_io/altium) gate + PCBNEW_IO_LIBRARIES dual list
pcbnew/pcb_io/pcb_io_mgr.cpp       # #ifndef blocks (CircuitMaker/Studio/Designer + Solidworks)

pcb_io/altium's deps (pcbcommon, compoundfilereader, magic_enum) are all already built for wasm. One root cause fixes both the eeschema and pcbnew sides.

Eagle / CADSTAR / LTspice / EasyEDA / EasyEDA-Pro (eeschema) — incidental MVP cut

eeschema/CMakeLists.txt excludes these in an if(NOT EMSCRIPTEN) block with the comment "cross-tool importers we don't need for the MVP and they bring transitive incompatible dependencies in." The dependency half is false today, and there's strong evidence the cut was incidental:

  • All their shared parsers already compile unconditionally in common/CMakeLists.txt (io/cadstar/cadstar_archive_parser.cpp, io/eagle/eagle_parser.cpp, io/easyeda/*, io/easyedapro/*).
  • pcbnew's wasm build already ships the equivalents — CADSTAR, EasyEDA, EasyEDA-Pro, Fabmaster, IPC-2581, ODB++, P-CAD (pcbnew/CMakeLists.txt), plus eagle + geda compiled straight into pcbcommon. Only Altium was excluded on the pcbnew side. If pcbnew builds them but eeschema doesn't, the eeschema exclusion is incidental.
  • Deps are all present: expat (eagle XML), nlohmann (easyeda), wxZip/zlib (easyedapro), plain text (ltspice, cadstar).

Do: move the five importer groups out of the if(NOT EMSCRIPTEN) block in eeschema/CMakeLists.txt and drop the matching #ifndef __EMSCRIPTEN__ cases in sch_io_mgr.cpp. (Altium-sch additionally needs the Altium common code from the section above.) Net-negative fork diff; no platform deps.

Stays impossible / policy

  • Database (SCH_IO_DATABASE) — needs nanodbc → ODBC driver manager → native drivers opening TCP to a DB server. No browser path; keep stubbed. (database_lib_settings.cpp still compiles for settings-file compatibility — fine.)
  • HTTP library (SCH_IO_HTTP_LIB) — already compiled and registered, but dead at runtime because the curl stub returns NULL. Reviving it is the curl→fetch shim in 12, not part of this refactor.

Verification

Build, then import: an Eagle .sch, an Altium .SchDoc/.PcbDoc, and one of CADSTAR/EasyEDA. Confirm the importer appears in the File → Import menu and round-trips geometry. The import dialogs use wxFileDialog (PARTIAL per tests/WHATWORKS.md), so verify the file-open flow too.