[bsp][ch32v208w] fix C++ compling errors

bsp/wch/risc-v/ch32v208w-r0/SConstruct

@@ -24,7 +24,7 @@ env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
     CC = rtconfig.CC, CFLAGS = rtconfig.CFLAGS,
     AR = rtconfig.AR, ARFLAGS = '-rc',
-    CXX = rtconfig.CXX,
+    CXX = rtconfig.CXX, CXXFLAGS = rtconfig.CXXFLAGS,
     LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
 env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
 

bsp/wch/risc-v/ch32v208w-r0/board/linker_scripts/link.lds

@@ -66,10 +66,19 @@ SECTIONS
     __rtmsymtab_end = .;
         . = ALIGN(4);
 
+    /* section information for initial. */
+    . = ALIGN(4);
+    __rt_init_start = .;
+    KEEP(*(SORT(.rti_fn*)))
+    __rt_init_end = .;
+
+    . = ALIGN(4);
+
     PROVIDE(__ctors_start__ = .);
     KEEP (*(SORT(.init_array.*)))
     KEEP (*(.init_array))
     PROVIDE(__ctors_end__ = .);
+
     . = ALIGN(4);
 
     _etext = .;

bsp/wch/risc-v/ch32v208w-r0/rtconfig.py

@@ -17,7 +17,7 @@ else:
 	
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
-    
+
 BUILD = 'debug'
 #BUILD = 'release'
 
@@ -57,6 +57,8 @@ if PLATFORM == 'gcc':
     else:
         CFLAGS += ' -O2'
 
+    CXXFLAGS = CFLAGS
+
     POST_ACTION = OBJCPY + ' -O binary $TARGET ' + TARGET_NAME + '\n'
     POST_ACTION += SIZE + ' $TARGET\n'