samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/dynlib.t

@@ -0,0 +1,47 @@
+local ffi = require 'ffi'
+-- test that the dynamic library for terra was built correctly
+-- by compiling a new program that links against it and running it
+terralib.includepath = terralib.terrahome.."/include/terra"
+C = terralib.includecstring [[
+#include <stdio.h>
+#include "terra.h"
+]]
+
+local libpath = terralib.terrahome.."/lib"
+
+terra doerror(L : &C.lua_State)
+    C.printf("%s\n",C.luaL_checklstring(L,-1,nil))
+end
+
+local thecode = "terra foo() return 1 end print(foo())"
+
+terra main(argc : int, argv : &rawstring)
+    var L = C.luaL_newstate();
+    C.luaL_openlibs(L);
+    if C.terra_init(L) ~= 0 then
+        doerror(L)
+    end
+    if C.terra_loadstring(L,thecode) ~= 0 or C.lua_pcall(L, 0, -1, 0) ~= 0 then
+        doerror(L)
+    end
+    return 0;
+end
+
+if ffi.os ~= "Windows" then
+    print(libpath)
+    local flags = terralib.newlist {"-L", libpath,"-Wl,-rpath,"..libpath,"-lterra_dynamic"}
+    if require("ffi").os == "OSX" then
+        flags:insertall {"-pagezero_size","10000", "-image_base", "100000000"}
+    end
+
+    terralib.saveobj("dynlib",{main = main},flags)
+
+    assert(0 == os.execute("./dynlib"))
+
+else
+    local putenv = terralib.externfunction("_putenv", rawstring -> int)
+    local flags = {libpath.."\\terra.lib",libpath.."\\lua51.lib"}
+    terralib.saveobj("dynlib.exe",{main = main},flags)
+    putenv("Path="..os.getenv("Path")..";"..terralib.terrahome.."\\bin") --make dll search happy
+    assert(0 == os.execute(".\\dynlib.exe"))
+end