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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
Download Patch File Download Diff File Expand all files Collapse all files
mlt_decode.cpp
+26 -6
View File
@@ -1,11 +1,5 @@
#include "mlt.hpp"
#include <mlt/decoder.hpp>
#include <mlt/geometry.hpp>
#include <mlt/layer.hpp>
#include <mlt/properties.hpp>
#include <mlt/tile.hpp>
#include <algorithm>
#include <cmath>
#include <cstdint>
@@ -18,6 +12,14 @@
#include <variant>
#include <vector>
#ifndef NO_MLT
#include <mlt/decoder.hpp>
#include <mlt/geometry.hpp>
#include <mlt/layer.hpp>
#include <mlt/properties.hpp>
#include <mlt/tile.hpp>
#endif
namespace {
bool read_varint(const char *&p, const char *end, unsigned long long &out) {
@@ -39,6 +41,8 @@ bool read_varint(const char *&p, const char *end, unsigned long long &out) {
return false;
}
#ifndef NO_MLT
long long round_coord(float v) {
return (long long) std::llround(v);
}
@@ -237,6 +241,8 @@ void convert_layer(const mlt::Layer &in, mvt_layer &out, const std::shared_ptr<s
}
}
#endif
} // namespace
bool is_mlt(const std::string &message) {
@@ -267,6 +273,18 @@ bool is_mlt(const std::string &message) {
return layer_tag == 1;
}
#ifdef NO_MLT
bool decode_mlt(const std::string &message, mvt_tile &out) {
(void) message;
(void) out;
fprintf(stderr, "This build was compiled without MapLibre Tile support\n");
return false;
}
#else
bool decode_mlt(const std::string &message, mvt_tile &out) {
try {
mlt::Decoder decoder(true);
@@ -289,3 +307,5 @@ bool decode_mlt(const std::string &message, mvt_tile &out) {
return false;
}
}
#endif