LUAMOD_API in 5.4 results in luaopen_blah nod found

[tobias@...]

Hi,

it seems in Lua 5.4, writing a module like this:

file foo.c

#include "lua.h"
#include "lauxlib.h"

static int l_bar( lua_State *L ) {
	lua_pushstring( L, "bar" );
	return 1;
}

static const struct luaL_Reg foolib[ ] = {
	  { "bar"   , l_bar  }
	, { NULL    , NULL   }
};

LUAMOD_API int luaopen_foo( lua_State *L ) {
	luaL_newlib( L, foolib );
	return 1;
}


compiled `/usr/bin/gcc -O2 -I../lua-5.4/build/include -shared -o foo.so foo.c`

../lua-5.4/build/bin/lua -i -e  "t=require'foo'"
../lua-5.4/build/bin/lua: error loading module 'foo' from file './foo.so':
	./foo.so: undefined symbol: luaopen_foo
stack traceback:
	[C]: in ?
	[C]: in function 'require'
	(command line):1: in main chunk
	[C]: in ?

If I don't use LUAMOD_API it works just fine. It does work in 5.3. Did I miss
 a changed behaviour?

Thank you,
-tobbik