haproxy Lua support begins with Lua 5.2. In order to ease the diagnostic on compilation error, a preprocessor error is added when an incompatible version is used.
The compatibility is determined by the presence of LUA_VERSION_NUM and its magic value (502 for Lua 5.2.x). --- src/hlua.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/hlua.c b/src/hlua.c index 9ded473..51e149e 100644 --- a/src/hlua.c +++ b/src/hlua.c @@ -4,6 +4,10 @@ #include <lua.h> #include <lualib.h> +#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 502 +#error "Requires Lua 5.2 or later." +#endif + #include <ebpttree.h> #include <common/cfgparse.h> -- 2.1.4
