1 files changed, 17 insertions, 0 deletions
diff --git a/src/pulsecore/macro.h b/src/pulsecore/macro.h
index ce88c1b9..bffcc264 100644
--- a/src/pulsecore/macro.h
+++ b/src/pulsecore/macro.h
@@ -80,6 +80,12 @@ static inline size_t PA_PAGE_ALIGN(size_t l) {
 
 #define PA_ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
 
+#if defined(__GNUC__)
+    #define PA_DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
+#else
+    #define PA_DECLARE_ALIGNED(n,t,v)      t v
+#endif
+
 /* The users of PA_MIN and PA_MAX, PA_CLAMP, PA_ROUND_UP should be
  * aware that these macros on non-GCC executed code with side effects
  * twice. It is thus considered misuse to use code with side effects
@@ -157,6 +163,17 @@ static inline size_t PA_PAGE_ALIGN(size_t l) {
 #define PA_ROUND_DOWN(a, b) (((a) / (b)) * (b))
 #endif
 
+#ifdef __GNUC__
+#define PA_CLIP_SUB(a, b)                       \
+    __extension__ ({                            \
+            typeof(a) _a = (a);                 \
+            typeof(b) _b = (b);                 \
+            _a > _b ? _a - _b : 0;              \
+        })
+#else
+#define PA_CLIP_SUB(a, b) ((a) > (b) ? (a) - (b) : 0)
+#endif
+
 /* This type is not intended to be used in exported APIs! Use classic "int" there! */
 #ifdef HAVE_STD_BOOL
 typedef _Bool pa_bool_t;