Bug#42733: Type-punning warnings when compiling MySQL --

           strict aliasing violations.

Another rather noisy violation of strict aliasing rules
is the spatial code which makes use of stack-based memory
(of type Geometry_buffer) to provide placement for Geometry
objects. Although a placement new is allowed to dynamically
change the type of a object, the object returned by the
new placement was being ignored and the original stack-based
object was being casted to the new type, thus violating strict
aliasing rules.

The solution is to reorganize the code so that the object
returned by the new placement is used instead of casting the
original object. Also, to ensure that the stack-based object
is properly aligned with respect to the objects it provides
placement for, a set of compiler-dependent macros and types
are introduced so that the alignment of objects can be inquired
and specified.

3 files changed, 128 insertions, 4 deletions

diff --git a/include/Makefile.am b/include/Makefile.am
index 130517a405e..182011c25a3 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -37,7 +37,7 @@ noinst_HEADERS =	config-win.h config-netware.h my_bit.h \
 			my_aes.h my_tree.h my_trie.h hash.h thr_alarm.h \
 			thr_lock.h t_ctype.h violite.h my_md5.h base64.h \
 			my_handler.h my_time.h my_vle.h my_user.h \
-			my_libwrap.h my_stacktrace.h
+			my_libwrap.h my_stacktrace.h my_compiler.h
 
 EXTRA_DIST =        mysql.h.pp mysql/plugin.h.pp
 
diff --git a/include/my_compiler.h b/include/my_compiler.h
new file mode 100644
index 00000000000..0a83c6587a5
--- /dev/null
+++ b/include/my_compiler.h
@@ -0,0 +1,127 @@
+#ifndef MY_COMPILER_INCLUDED
+#define MY_COMPILER_INCLUDED
+
+/* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/**
+  Header for compiler-dependent features.
+
+  Intended to contain a set of reusable wrappers for preprocessor
+  macros, attributes, pragmas, and any other features that are
+  specific to a target compiler.
+*/
+
+#include <my_global.h>                          /* stddef.h offsetof */
+
+/**
+  Compiler-dependent internal convenience macros.
+*/
+
+/* GNU C/C++ */
+#if defined __GNUC__
+/* Any after 2.95... */
+# define MY_ALIGN_EXT
+
+/* Microsoft Visual C++ */
+#elif defined _MSC_VER
+# define MY_ALIGNOF(type)   __alignof(type)
+# define MY_ALIGNED(n)      __declspec(align(n))
+
+/* Oracle Solaris Studio */
+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+# if (__SUNPRO_C >= 0x590) || (__SUNPRO_CC >= 0x590)
+#   define MY_ALIGN_EXT
+# endif
+
+/* IBM XL C/C++ */
+#elif defined __xlC__
+# if __xlC__ >= 0x0600
+#   define MY_ALIGN_EXT
+# endif
+
+/* HP aCC */
+#elif defined(__HP_aCC) || defined(__HP_cc)
+# if (__HP_aCC >= 60000) || (__HP_cc >= 60000)
+#   define MY_ALIGN_EXT
+# endif
+#endif
+
+#ifdef MY_ALIGN_EXT
+/** Specifies the minimum alignment of a type. */
+# define MY_ALIGNOF(type)   __alignof__(type)
+/** Determine the alignment requirement of a type. */
+# define MY_ALIGNED(n)      __attribute__((__aligned__((n))))
+#endif
+
+/**
+  Generic compiler-dependent features.
+*/
+#ifndef MY_ALIGNOF
+# ifdef __cplusplus
+    template<typename type> struct my_alignof_helper { char m1; type m2; };
+    /* Invalid for non-POD types, but most compilers give the right answer. */
+#   define MY_ALIGNOF(type)   offsetof(my_alignof_helper<type>, m2)
+# else
+#   define MY_ALIGNOF(type)   offsetof(struct { char m1; type m2; }, m2)
+# endif
+#endif
+
+/**
+  C++ Type Traits
+*/
+
+#ifdef __cplusplus
+
+/**
+  Opaque storage with a particular alignment.
+*/
+# if defined(MY_ALIGNED)
+/* Partial specialization used due to MSVC++. */
+template<size_t alignment> struct my_alignment_imp;
+template<> struct MY_ALIGNED(1) my_alignment_imp<1> {};
+template<> struct MY_ALIGNED(2) my_alignment_imp<2> {};
+template<> struct MY_ALIGNED(4) my_alignment_imp<4> {};
+template<> struct MY_ALIGNED(8) my_alignment_imp<8> {};
+template<> struct MY_ALIGNED(16) my_alignment_imp<16> {};
+/* ... expand as necessary. */
+# else
+template<size_t alignment>
+struct my_alignment_imp { double m1; };
+# endif
+
+/**
+  A POD type with a given size and alignment.
+
+  @remark If the compiler does not support a alignment attribute
+          (MY_ALIGN macro), the default alignment of a double is
+          used instead.
+
+  @tparam size        The minimum size.
+  @tparam alignment   The desired alignment: 1, 2, 4, 8 or 16.
+*/
+template <size_t size, size_t alignment>
+struct my_aligned_storage
+{
+  union
+  {
+    char data[size];
+    my_alignment_imp<alignment> align;
+  };
+};
+
+#endif /* __cplusplus */
+
+#endif /* MY_COMPILER_INCLUDED */
diff --git a/include/my_global.h b/include/my_global.h
index f03ed665d5a..6723267ae50 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -941,9 +941,6 @@ typedef long long	my_ptrdiff_t;
 #define ADD_TO_PTR(ptr,size,type) (type) ((uchar*) (ptr)+size)
 #define PTR_BYTE_DIFF(A,B) (my_ptrdiff_t) ((uchar*) (A) - (uchar*) (B))
 
-#define MY_DIV_UP(A, B) (((A) + (B) - 1) / (B))
-#define MY_ALIGNED_BYTE_ARRAY(N, S, T) T N[MY_DIV_UP(S, sizeof(T))]
-
 /*
   Custom version of standard offsetof() macro which can be used to get
   offsets of members in class for non-POD types (according to the current