Rename __clz to xenomai_count_leading_zeros

This is to avoid namespace conflicts (e.g.: with Clang's arm_acle.h)
Signed-off-by: Giulio Moro <giuliomoro@yahoo.it>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

include/boilerplate/compiler.h

@@ -93,7 +93,7 @@ void __invalid_operand_size(void);
 		__ret;							\
 	})
 
-#define __clz(__v)							\
+#define xenomai_count_leading_zeros(__v)				\
 	({								\
 		int __ret;						\
 		if (!__v)						\

lib/boilerplate/heapmem.c

@@ -435,7 +435,8 @@ void *heapmem_alloc(struct heap_memory *heap, size_t size)
 		bsize = size = HEAPMEM_MIN_ALIGN;
 		log2size = HEAPMEM_MIN_LOG2;
 	} else {
-		log2size = sizeof(size) * CHAR_BIT - 1 - __clz(size);
+		log2size = sizeof(size) * CHAR_BIT - 1 -
+			xenomai_count_leading_zeros(size);
 		if (log2size < HEAPMEM_PAGE_SHIFT) {
 			if (size & (size - 1))
 				log2size++;

lib/copperplate/heapobj-heapmem.c

@@ -68,7 +68,8 @@ int __heapobj_init_private(struct heapobj *hobj, const char *name,
 int heapobj_init_array_private(struct heapobj *hobj, const char *name,
 			       size_t size, int elems)
 {
-	size_t log2 = sizeof(size) * CHAR_BIT - 1 - __clz(size);
+	size_t log2 = sizeof(size) * CHAR_BIT - 1 -
+		xenomai_count_leading_zeros(size);
 
 	/*
 	 * Heapmem aligns individual object sizes on the next ^2

lib/copperplate/heapobj-pshared.c

@@ -488,7 +488,8 @@ static void *sheapmem_alloc(struct shared_heap_memory *heap, size_t size)
 		bsize = size = SHEAPMEM_MIN_ALIGN;
 		log2size = SHEAPMEM_MIN_LOG2;
 	} else {
-		log2size = sizeof(size) * CHAR_BIT - 1 - __clz(size);
+		log2size = sizeof(size) * CHAR_BIT - 1 -
+			xenomai_count_leading_zeros(size);
 		if (log2size < SHEAPMEM_PAGE_SHIFT) {
 			if (size & (size - 1))
 				log2size++;