Fix these warnings:
dlmalloc.c: In function 'free':
dlmalloc.c:2507: warning: dereferencing pointer '({anonymous})' does break
strict-aliasing rules
dlmalloc.c:2507: warning: dereferencing pointer '({anonymous})' does break
strict-aliasing rules
dlmalloc.c:2507: warning: dereferencing pointer '({anonymous})' does break
strict-aliasing rules
Some
page(http://blog.worldofcoding.com/2010/02/solving-gcc-44-strict-aliasing-problems.html)
suggests adding __attribute__((__may_alias__)). Doing so makes the warnings go
away.
---
common/dlmalloc.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index 2276532..c78cacc 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1155,7 +1155,7 @@ struct malloc_chunk
INTERNAL_SIZE_T size; /* Size in bytes, including overhead. */
struct malloc_chunk* fd; /* double links -- used only if free. */
struct malloc_chunk* bk;
-};
+} __attribute__((__may_alias__)) ;
typedef struct malloc_chunk* mchunkptr;
@@ -1443,7 +1443,7 @@ nextchunk->
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#define NAV 128 /* number of bins */
-typedef struct malloc_chunk* mbinptr;
+typedef struct malloc_chunk* mbinptr __attribute__((__may_alias__));
/* access macros */
--
1.7.2.2
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