Add ia32 support and fix compiling issue for RT-Thread (#730)

core/iwasm/aot/SConscript

@@ -13,6 +13,7 @@ cwd     = GetCurrentDir()
 src = Split('''
 aot_loader.c
 aot_runtime.c
+aot_intrinsic.c
 ''')
 
 if rtconfig.ARCH == 'arm':
@@ -20,7 +21,8 @@ if rtconfig.ARCH == 'arm':
         src += ['arch/aot_reloc_thumb.c']
     elif re.match('^cortex-a.*', rtconfig.CPU):
         src += ['arch/aot_reloc_arm.c']
-
+elif rtconfig.ARCH == 'ia32':
+    src += ['arch/aot_reloc_x86_32.c']
 
 CPPPATH = [cwd, cwd + '/../include']
 

core/iwasm/common/SConscript

@@ -18,6 +18,8 @@ if rtconfig.ARCH == 'arm':
         src += ['arch/invokeNative_thumb.s']
     elif re.match('^cortex-a.*', rtconfig.CPU):
         src += ['arch/invokeNative_arm.s']
+elif rtconfig.ARCH == 'ia32':
+    src += ['arch/invokeNative_ia32.s']
 
 CPPPATH = [cwd, cwd + '/../include']
 

core/shared/platform/rt-thread/platform_internal.h

@@ -25,6 +25,8 @@
 #define BUILD_TARGET "armv6"
 #elif defined(RTT_WAMR_BUILD_TARGET_ARMV4)
 #define BUILD_TARGET "armv4"
+#elif defined(RTT_WAMR_BUILD_TARGET_X86_32)
+#define BUILD_TARGET "X86_32"
 #else
 #error "unsupported aot platform."
 #endif

core/shared/platform/rt-thread/rtt_platform.c

@@ -180,12 +180,10 @@ void os_munmap(void *addr, size_t size)
     rt_free(addr);
 }
 
-#ifdef OS_ENABLE_HW_BOUND_CHECK
 int os_mprotect(void *addr, size_t size, int prot)
 {
     return 0;
 }
-#endif
 
 void os_dcache_flush(void)
 {