Replace CL_REQUIRE/CL_PROVIDE(cl_SV_number) with portable code.

The order of initialization of non-local objects in different compilation units
is not specified in C++. Hence special care should be taken to avoid static
initialization order fiasco. CLN solved the problem with some evil (GCC
specific, and even GCC-version-specific) hack. Replace it with a technique
similar to one used in STL to initialize std::cout and friends.

include/cln/SV_number.h

@@ -43,7 +43,14 @@ inline cl_SV_number::operator cl_heap_SV_number* () const
 extern const cl_SV_number cl_null_SV_number;
 inline cl_SV_number::cl_SV_number ()
 	: cl_SV<cl_number,cl_SV_any> ((cl_heap_SV_number*) cl_null_SV_number) {}
-CL_REQUIRE(cl_SV_number)
+class cl_SV_number_init_helper
+{
+	static int count;
+public:
+	cl_SV_number_init_helper();
+	~cl_SV_number_init_helper();
+};
+static cl_SV_number_init_helper cl_SV_number_init_helper_instance;
 
 // Copy a simple vector.
 inline const cl_SV_number copy (const cl_SV_number& vector)

src/vector/cl_SV_number.cc

@@ -3,12 +3,9 @@
 // General includes.
 #include "cl_sysdep.h"
 
-CL_PROVIDE(cl_SV_number)
-
 // Specification.
 #include "cln/SV_number.h"
 
-
 // Implementation.
 
 namespace cln {
@@ -22,16 +19,22 @@ static void cl_svector_number_destructor (cl_heap* pointer)
 #endif
 }
 
-cl_class cl_class_svector_number = {
-	cl_svector_number_destructor,
-	0
-};
+// XXX: ugh, this needs to be non-static (and non-const) so redefining
+// debugging function is possible (see cl_SV_number_debug.cc) 
+cl_class& cl_class_svector_number()
+{
+	static cl_class instance = {
+		cl_svector_number_destructor,
+		0
+	};
+	return instance;
+}
 
 cl_heap_SV_number* cl_make_heap_SV_number_uninit (uintC len)
 {
 	var cl_heap_SV_number* hv = (cl_heap_SV_number*) malloc_hook(sizeof(cl_heap_SV_number)+sizeof(cl_number)*len);
 	hv->refcount = 1;
-	hv->type = &cl_class_svector_number;
+	hv->type = &cl_class_svector_number();
 	new (&hv->v) cl_SV_inner<cl_number> (len);
 	// Have to fill hv->v[i] (0 <= i < len) yourself.
 	return hv;
@@ -41,7 +44,7 @@ cl_heap_SV_number* cl_make_heap_SV_number (uintC len)
 {
 	var cl_heap_SV_number* hv = (cl_heap_SV_number*) malloc_hook(sizeof(cl_heap_SV_number)+sizeof(cl_number)*len);
 	hv->refcount = 1;
-	hv->type = &cl_class_svector_number;
+	hv->type = &cl_class_svector_number();
 	new (&hv->v) cl_SV_inner<cl_number> (len);
 	for (var uintC i = 0; i < len; i++)
 		init1(cl_number, hv->v[i]) (0);
@@ -49,8 +52,22 @@ cl_heap_SV_number* cl_make_heap_SV_number (uintC len)
 }
 
 // An empty vector.
-const cl_SV_number cl_null_SV_number = cl_SV_number((uintC)0);
+const cl_SV_number cl_null_SV_number = cl_null_SV_number;
+
+int cl_SV_number_init_helper::count = 0;
+
+cl_SV_number_init_helper::cl_SV_number_init_helper()
+{
+	if (count++ == 0)
+		new ((void *)&cl_null_SV_number) cl_SV_number((uintC)0);
+}
+
+cl_SV_number_init_helper::~cl_SV_number_init_helper()
+{
+	if (--count == 0) {
+		// Nothing to clean up
+	}
+}
 
 }  // namespace cln
 
-CL_PROVIDE_END(cl_SV_number)

src/vector/cl_SV_number_debug.cc

@@ -29,7 +29,7 @@ static void dprint (cl_heap* pointer)
 	print_vector(cl_debugout,default_print_flags,&print_for_debug,obj);
 }
 AT_INITIALIZATION(dprint_SV_number)
-{ cl_register_type_printer(cl_class_svector_number,dprint); }
+{ extern cl_class& cl_class_svector_number(); cl_class_svector_number().dprint = dprint; }
 
 // This dummy links in this module when <cln/SV_number.h> requires it.
 int cl_SV_number_debug_module;