ldso: Fix RISC-V support with 21.05 tool chain

- force inlining of more functions
- force -O2 for RISC-V (even if -O0 is set globally)
- intialize cxx guard after self relocation

issue #4094

repos/base/lib/mk/spec/riscv/ld-platform.inc

@@ -1,3 +1,9 @@
+#
+# Force to build -O2 on RISC-V in order to get proper inlining during self
+# relocation
+#
+override CC_OLEVEL = -O2
+
 include $(BASE_DIR)/lib/mk/ld-platform.inc
 
 INC_DIR += $(DIR)/spec/riscv

repos/base/src/lib/ldso/include/dynamic.h

@@ -179,7 +179,7 @@ class Linker::Dynamic
 
 		enum Pass { FIRST_PASS, SECOND_PASS };
 
-		Dynamic(Dependency const &dep)
+		Dynamic(Dependency const &dep) SELF_RELOC
 		:
 			_dep(&dep), _obj(dep.obj()), _dynamic(*(Elf::Dyn *)dynamic_address())
 		{
@@ -339,7 +339,7 @@ class Linker::Dynamic
 				Plt_got r(*_dep, _pltgot);
 		}
 
-		void relocate_non_plt(Bind bind, Pass pass)
+		void relocate_non_plt(Bind bind, Pass pass) SELF_RELOC
 		{
 			if (_reloca)
 				Reloc_non_plt r(*_dep, _reloca, _reloca_size, pass == SECOND_PASS);

repos/base/src/lib/ldso/main.cc

@@ -127,7 +127,7 @@ class Linker::Elf_object : public Object, private Fifo<Elf_object>::Element
 	public:
 
 		Elf_object(Dependency const &dep, Object::Name const &name,
-		           Elf::Addr reloc_base)
+		           Elf::Addr reloc_base) SELF_RELOC
 		:
 			_elf_object_initialized(_object_init(name, reloc_base)),
 			_dyn(dep)
@@ -261,7 +261,7 @@ class Linker::Elf_object : public Object, private Fifo<Elf_object>::Element
  */
 struct Linker::Ld : private Dependency, Elf_object
 {
-	Ld() :
+	Ld() SELF_RELOC :
 		Dependency(*this, nullptr),
 		Elf_object(*this, linker_name(), relocation_address())
 	{ }
@@ -651,9 +651,6 @@ Elf::Sym const *Linker::lookup_symbol(char const *name, Dependency const &dep,
  */
 extern "C" void init_rtld()
 {
-	/* init cxa guard mechanism before any local static variables are used */
-	init_cxx_guard();
-
 	/*
 	 * Allocate on stack, since the linker has not been relocated yet, the vtable
 	 * type relocation might produce a wrong vtable pointer (at least on ARM), do
@@ -662,6 +659,9 @@ extern "C" void init_rtld()
 	Ld linker_on_stack;
 	linker_on_stack.relocate(BIND_LAZY);
 
+	/* init cxa guard mechanism before any local static variables are used */
+	init_cxx_guard();
+
 	/*
 	 * Create actual linker object with different vtable type and set PLT to new
 	 * DAG.