Cleanup: Move lib/ringbuffer/ headers to include/ringbuffer/

[lttng-modules.git] / lib / bitfield.h

diff --git a/lib/bitfield.h b/lib/bitfield.h
index ebbe7544cdd585bff9351416490dc43c5cb67718..7d5eaeaa068ddadb7631d9f88750453bc9aa47a2 100644 (file)
--- a/lib/bitfield.h
+++ b/lib/bitfield.h
@@ -29,8 +29,10 @@
 /*
  * _bt_is_signed_type() willingly generates comparison of unsigned
  * expression < 0, which is always false. Silence compiler warnings.
+ * GCC versions lower than 4.6.0 do not accept diagnostic pragma inside
+ * functions.
  */
-#ifdef __GNUC__
+#if defined(__GNUC__) && (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 40600
 # define _BT_DIAG_PUSH                 _Pragma("GCC diagnostic push")
 # define _BT_DIAG_POP                  _Pragma("GCC diagnostic pop")
 
@@ -53,8 +55,12 @@
  * Produce a build-time error if the condition `cond` is non-zero.
  * Evaluates as a size_t expression.
  */
+#ifdef __cplusplus
+#define _BT_BUILD_ASSERT(cond) ([]{static_assert((cond), "");}, 0)
+#else
 #define _BT_BUILD_ASSERT(cond)                                 \
        sizeof(struct { int f:(2 * !!(cond) - 1); })
+#endif
 
 /*
  * Cast value `v` to an unsigned integer of the same size as `v`.
@@ -360,7 +366,7 @@ do {                                                                        \
 do {                                                                   \
        __typeof__(*(vptr)) *_vptr = (vptr);                            \
        __typeof__(*_vptr) _v;                                          \
-       type *_ptr = (void *) (ptr);                                    \
+       type *_ptr = (type *) (ptr);                                    \
        unsigned long _start = (start), _length = (length);             \
        type _mask, _cmask;                                             \
        unsigned long _ts = sizeof(type) * CHAR_BIT; /* type size */    \