diff --git a/V203/usb/ch32v203/startup.cpp b/V203/usb/ch32v203/startup.cpp
index 1c21ff6..f7474f3 100644
--- a/V203/usb/ch32v203/startup.cpp
+++ b/V203/usb/ch32v203/startup.cpp
@@ -1,9 +1,9 @@
 #include "system.h"
 typedef __SIZE_TYPE__ size_t;
 extern "C" {
-  extern void handle_reset () __attribute__((naked,nothrow,used));
-  extern void user_init ()    __attribute__((used));
-  extern int  main      ()    __attribute__((used));
+  [[using gnu: naked,nothrow,used]] extern void handle_reset ();
+  [[gnu::used]] extern void user_init ();
+  [[gnu::used]] extern int  main      ();
   // This is required to allow pure virtual functions to be defined.
   extern void __cxa_pure_virtual() { while (1); }
 
@@ -14,41 +14,17 @@ extern "C" {
   extern uint32_t _data_vma;
   extern uint32_t _edata;
 
-  extern void (*__preinit_array_start[]) (void) __attribute__((weak));
-  extern void (*__preinit_array_end[]) (void) __attribute__((weak));
-  extern void (*__init_array_start[]) (void) __attribute__((weak));
-  extern void (*__init_array_end[]) (void) __attribute__((weak));
+  [[gnu::weak]] extern void (*__preinit_array_start[]) (void);
+  [[gnu::weak]] extern void (*__preinit_array_end[]) (void);
+  [[gnu::weak]] extern void (*__init_array_start[]) (void);
+  [[gnu::weak]] extern void (*__init_array_end[]) (void);
 
-  static void __init_array () {
-      uint32_t * dst, * end;
-
-      /* Zero fill the bss section */
-      dst = &_sbss;
-      end = &_ebss;
-      while (dst < end) * dst++ = 0U;
-      /* Copy data section from flash to RAM */
-      uint32_t * src;
-      src = &_data_lma;
-      dst = &_data_vma;
-      end = &_edata;
-      if (src != dst) {
-        while (dst < end) * dst++ = * src++;
-      }
-      
-      size_t count;
-      /* Pro Cortex-Mx bylo toto zbytečné, lze předpokládat, že je to tak i zde.
-      count = __preinit_array_end - __preinit_array_start;
-      for (unsigned i = 0; i < count; i++)  __preinit_array_start[i]();
-      */
-      count = __init_array_end - __init_array_start;
-      for (unsigned i = 0; i < count; i++)  __init_array_start[i]();
-  }
   // If you don't override a specific handler, it will just spin forever.
-  void DefaultIRQHandler( void ) {
+  [[gnu::interrupt]] void DefaultIRQHandler( void ) {
       // Infinite Loop
       for (;;);
   }
-  void NMI_RCC_CSS_IRQHandler( void ) {
+  [[gnu::interrupt]] void NMI_RCC_CSS_IRQHandler( void ) {
       RCC.INTR.B.CSSC = RESET;	// clear the clock security int flag
   }
   #define ALIAS(f) __attribute__((nothrow,weak,alias(#f),used))
@@ -255,10 +231,35 @@ R"---(
 : : [main]"r"(user_init)/*, [InterruptVector]"r"(InterruptVector)*/
 : "t0", "memory" );
 }
+static void init_variables () {
+    uint32_t * dst, * end;
+
+    /* Zero fill the bss section */
+    dst = &_sbss;
+    end = &_ebss;
+    while (dst < end) * dst++ = 0U;
+    /* Copy data section from flash to RAM */
+    uint32_t * src;
+    src = &_data_lma;
+    dst = &_data_vma;
+    end = &_edata;
+    if (src != dst) {
+      while (dst < end) * dst++ = * src++;
+    }
+}    
+static void init_constructors () {
+    /* Pro Cortex-Mx bylo toto zbytečné, lze předpokládat, že je to tak i zde.
+    count = __preinit_array_end - __preinit_array_start;
+    for (unsigned i = 0; i < count; i++)  __preinit_array_start[i]();
+    */
+    const size_t count = __init_array_end - __init_array_start;
+    for (unsigned i = 0; i < count; i++)  __init_array_start[i]();
+}
 void user_init () {
+  init_variables();
   SystemInit();
   SystemCoreClockUpdate();
-  __init_array();
+  init_constructors();      // Konstruktory zavolat až po inicializaci hodin
   main ();
   for (;;);
 }