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Add a MLT=0 build for a tippecanoe without MapLibre Tile support

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MapLibre Tile support pulls in the maplibre-tile-spec submodule and needs
cmake to build it, which is a lot to ask of anyone who only wants to work
with Mapbox Vector Tiles.

`make MLT=0` compiles with -DNO_MLT, skips the submodule and its cmake
build entirely, and drops the MLT tests from `make test`. The result needs
no dependencies beyond the ones MVT already needed, and can be built from
a checkout with no submodules at all.

Everything that touches the MLT library is behind the #ifdef, which is
just the two files that were written for it. The option parsing and the
tile format helpers stay compiled either way, so nothing else needs to
know: --output-format=mlt reports that the build has no MLT support rather
than being an unrecognized value, and a tile that is recognized as MLT
reports the same instead of being misparsed as a protobuf, since the
format sniffing itself doesn't need the library.

CI builds and tests this configuration from a checkout without submodules,
so it can't quietly stop working.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LxhELiLtpUFwrPSWwTYdHG
This commit is contained in:
Claude
2026-08-06 18:05:42 +00:00
parent 13f1c3b6e4
commit c70d98afe8
6 changed files with 94 additions and 19 deletions
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mlt.hpp
+4 -1
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@@ -24,14 +24,17 @@ const char *tile_format_extension(int format);
// options were selected on the command line
std::string encode_tile(mvt_tile &tile, int format);
#ifndef NO_MLT
std::string encode_as_mlt(const mvt_tile &tile, bool sort_features, bool pretessellate);
#endif
// Does this (already decompressed) tile look like MapLibre Tile rather than
// Mapbox Vector Tile data?
bool is_mlt(const std::string &message);
// Decode a MapLibre Tile into the equivalent vector tile, returning false
// (and complaining to stderr) if it can't be parsed.
// (and complaining to stderr) if it can't be parsed, or if this build
// doesn't have MLT support compiled in.
bool decode_mlt(const std::string &message, mvt_tile &out);
#endif