adding --extra option and correction pathes to ispc compiler

run_tests.py

@@ -498,16 +498,26 @@ def run_tests(options1, args, print_version):
     # use relative path to not depend on host directory, which may possibly
     # have white spaces and unicode characters.
     global ispc_exe
+    ispc_exe = ""
     if not is_windows:
-        ispc_exe = "./ispc"
+        if os.environ.get("ISPC_HOME") != None:
+            if os.path.exists(os.environ["ISPC_HOME"] + os.sep + "ispc"):
+                ispc_exe = os.environ["ISPC_HOME"] + os.sep + "ispc"
+            else:
+                PATH_dir = string.split(os.getenv("PATH"), os.pathsep)
+                for counter in PATH_dir:
+                    if os.path.exists(counter + os.sep + "ispc"):
+                        ispc_exe = counter + os.sep + "ispc"
     else:
-        ispc_exe = ".\\Release\\ispc.exe"
- 
+        if os.path.exists(".\\Release\\ispc.exe"):
+            ispc_exe = ".\\Release\\ispc.exe"
+        else:
+            error("You don't have ispc.exe compiler in .\\Release.\n", 1)
     # checks the required ispc compiler otherwise prints an error message
-    if not os.path.exists(ispc_exe):
-        error("missing ispc compiler: %s\n" % ispc_exe, 1)
+    if ispc_exe == "":
+        error("ISPC compiler not found.\nAdded path to ispc compiler to your PATH variable or ISPC_HOME variable\n", 1)
+    print_debug("Testing ispc: " + ispc_exe + "\n", s, run_tests_log)
     ispc_exe += " " + options.ispc_flags
-    print_debug("ispc compiler: %s\n" % ispc_exe, s, run_tests_log)
 
     global is_generic_target 
     is_generic_target = (options.target.find("generic-") != -1 and