Add option to build gdbserver for target that does not require libstdc++.so

config/debug/gdb.in.gdbserver

@@ -40,6 +40,15 @@ config GDB_GDBSERVER_STATIC
       https://sourceware.org/bugzilla/show_bug.cgi?id=19617
       https://sourceware.org/bugzilla/show_bug.cgi?id=21086
 
+config GDB_GDBSERVER_STATIC_LIBSTDCXX
+    bool
+    prompt "Link against static libstdc+++"
+    depends on !GDB_GDBSERVER_STATIC
+    default n
+    help
+      Say 'y' if you do not want gdbserver to require libstdc++.so on the
+      target.
+
 config GDB_GDBSERVER_BUILD_IPA_LIB
     bool
     prompt "Build the IPA library"

scripts/build/debug/300-gdb.sh

@@ -319,6 +319,10 @@ do_debug_gdb_build() {
             gdbserver_LDFLAGS=-static
         fi
 
+        if [ "${CT_GDB_GDBSERVER_STATIC_LIBSTDCXX}" = "y" ]; then
+            gdbserver_LDFLAGS+=" -static-libstdc++"
+        fi
+
         gdbserver_extra_config=("${extra_config[@]}")
 
         # We may not have C++ language configured for target