simulator: add createdef.py to generate def file for VS

Now we can get rid off Mingw to create def file. To create def file, one
should run:

    scons --def

in the bsp/simulator.

bsp/simulator/SConstruct

@@ -122,13 +122,12 @@ if GetDepend('RT_USING_MODULE'):
       default=False,
       help='create rthread.def of rtthread.dll on windows')
     if GetOption('def'):
-        if rtconfig.PLATFORM != 'mingw':
-            print "scons error: `--def' can only work with mingw"
-            exit(1)
+        if rtconfig.PLATFORM == 'mingw':
+            env['LINKFLAGS'] = rtconfig.DEFFILE_LFLAGS
+        else:
+            rtconfig.POST_ACTION = 'createdef.py $TARGET rtthread.def'
 
-        env['LINKFLAGS'] = rtconfig.DEFFILE_LFLAGS
-        env.SharedLibrary("rtthread.dll", objs)
-        program = ''
+        program = env.Program(TARGET, objs)
     else:
         if rtconfig.PLATFORM == 'cl':
             objs += ['rtthread.def']

bsp/simulator/createdef.py

+import re
+import sys
+
+fsrc = "rtthread.dll"
+fname ="rtthread.def"
+prefix = "__vs_rtm_"
+
+if len(sys.argv) >= 2:
+    fsrc = sys.argv[1]
+    fname = sys.argv[2]
+
+#restr = r"__vs_rtm_.*?\0"
+restr = prefix + r".*?\0"
+s = open(fsrc, 'rb').read()
+l = re.findall(restr, s, re.S)
+lines = [i[len(prefix):-1] for i in l]
+
+s = '\n'.join(lines)
+
+fout = open(fname, 'w')
+fout.write('EXPORTS\n')
+fout.write('main\n')
+fout.write(s)

bsp/simulator/drivers/module_win32.c

@@ -128,7 +128,7 @@ void rt_module_unload_sethook(void (*hook)(rt_module_t module))
  *
  * This function will initialize system module
  */
-void rt_system_module_init(void)
+int rt_system_module_init(void)
 {
 }
 

include/rtm.h

@@ -31,8 +31,15 @@ struct rt_module_symtab
     const char *name;
 };
 
-#if defined(_MSC_VER) || defined(__MINGW32__)
+#if defined(_MSC_VER)
+#pragma section("RTMSymTab$f",read)
+#define RTM_EXPORT(symbol)                                            \
+__declspec(allocate("RTMSymTab$f"))const char __rtmsym_##symbol##_name[] = "__vs_rtm_"#symbol;
+#pragma comment(linker, "/merge:RTMSymTab=mytext")
+
+#elif defined(__MINGW32__)
 #define RTM_EXPORT(symbol)
+
 #else
 #define RTM_EXPORT(symbol)                                            \
 const char __rtmsym_##symbol##_name[] = #symbol;                      \