enforce lua version compatibility #298
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A portion of Luvi code is embedded into the binary as bytecode. This poses an issue in builds with shared libluv (and therefore shared luajit) where the version of Lua(JIT) used to compile Luvi may be different from the version present on the target machine.
Both LuaJIT and PUC Lua 5.2+ provide mechanisms to emit an error when this occurs. In PUC Lua this is done via
luaL_checkversion(L)which throws a Lua error when it fails. We call this as soon as we create a new state to ensure that the error is fatal.In LuaJIT this is done via an exported symbol
LUAJIT_VERSION_SYMthat matches the version of LuaJIT during compilation. The dynamic loader will fail if this symbol cannot be found in the LuaJIT dynamic library.These checks happen on a best effort basis: some distributions (like Ubuntu) use patched versions of LuaJIT that is missing
LUAJIT_VERSION_SYM, andluaL_checkversion(L)was implemented in 5.2, and as such is missing in 5.1.