update .ld and SConstruct files

bsp/raspberry-pico/SConstruct

@@ -16,7 +16,7 @@ DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CFLAGS = rtconfig.CFLAGS,
-    CXX = rtconfig.CXX,
+    CXX = rtconfig.CXX, CXXFLAGS = rtconfig.CXXFLAGS,
     AR = rtconfig.AR, ARFLAGS = '-rc',
     LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
 env.PrependENVPath('PATH', rtconfig.EXEC_PATH)

bsp/raspberry-pico/link.ld

@@ -88,6 +88,8 @@ SECTIONS
         KEEP(*(SORT(.rti_fn*)))
         __rt_init_end = .;
 
+        . = ALIGN(4);
+        
         /* Pull all c'tors into .text */
         *crtbegin.o(.ctors)
         *crtbegin?.o(.ctors)
@@ -102,7 +104,15 @@ SECTIONS
         *(.dtors)
 
         *(.eh_frame*)
+
+        PROVIDE(__ctors_start__ = .);
+        KEEP (*(SORT(.init_array.*)))
+        KEEP (*(.init_array))
+        PROVIDE(__ctors_end__ = .);
+
         . = ALIGN(4);
+        
+        _etext = .;
     } > FLASH
 
     .rodata : {