Add JEMALLOC_CC_SILENCE_INIT().

Add JEMALLOC_CC_SILENCE_INIT(), which provides succinct syntax for
initializing a variable to avoid a spurious compiler warning.

2 files changed, 12 insertions, 5 deletions

diff --git a/include/jemalloc/internal/jemalloc_internal.h.in b/include/jemalloc/internal/jemalloc_internal.h.in
index 387aabb..e055814 100644
--- a/include/jemalloc/internal/jemalloc_internal.h.in
+++ b/include/jemalloc/internal/jemalloc_internal.h.in
@@ -611,11 +611,7 @@ ipalloc(size_t usize, size_t alignment, bool zero)
 	if (usize <= arena_maxclass && alignment <= PAGE_SIZE)
 		ret = arena_malloc(usize, zero);
 	else {
-		size_t run_size
-#ifdef JEMALLOC_CC_SILENCE
-		    = 0
-#endif
-		    ;
+		size_t run_size JEMALLOC_CC_SILENCE_INIT(0);
 
 		/*
 		 * Ideally we would only ever call sa2u() once per aligned
diff --git a/include/jemalloc/internal/util.h b/include/jemalloc/internal/util.h
index fb354da..5156399 100644
--- a/include/jemalloc/internal/util.h
+++ b/include/jemalloc/internal/util.h
@@ -17,6 +17,17 @@
 #define JEMALLOC_CONCAT(...) __VA_ARGS__
 
 /*
+ * Silence compiler warnings due to uninitialized values.  This is used
+ * wherever the compiler fails to recognize that the variable is never used
+ * uninitialized.
+ */
+#ifdef JEMALLOC_CC_SILENCE
+#  define JEMALLOC_CC_SILENCE_INIT(v) = v
+#else
+#  define JEMALLOC_CC_SILENCE_INIT(v)
+#endif
+
+/*
  * Define a custom assert() in order to reduce the chances of deadlock during
  * assertion failure.
  */