[Tile-serving] [openstreetmap/osm2pgsql] Provide a stack trace on a lua error with flex backend (#1142)

[mmd]

See issue #1136

Almost exactly the same code that is in use in the Lua interpreter, except for the signal handling: https://github.com/lua/lua/blob/master/lua.c#L109-L142


You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1142

-- Commit Summary --

  * Provide a stack trace on a lua error with flex backend

-- File Changes --

    M src/output-flex.cpp (27)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1142.patch
https://github.com/openstreetmap/osm2pgsql/pull/1142.diff

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