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/*-
* Copyright (c) 2008-2013 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* NOTE: If you see a compile failure in this file, your compiler is laying out
* structs in memory in a way WiredTiger does not expect. Please refer to the
* build instructions in the documentation (docs/html/install.html) for more
* information.
*/
/*
* Compile time assertions.
*
* If the argument to STATIC_ASSERT is zero, the macro evaluates to:
*
* (void)sizeof(char[-1])
*
* which fails to compile (which is what we want, the assertion failed).
* If the value of the argument to STATIC_ASSERT is non-zero, then the macro
* evaluates to:
*
* (void)sizeof(char[1]);
*
* which compiles with no warnings, and produces no code.
*
* For more details about why this works, see
* http://scaryreasoner.wordpress.com/2009/02/28/
*/
#define STATIC_ASSERT(cond) (void)sizeof(char[1 - 2 * !(cond)])
#define SIZE_CHECK(type, e) do { \
char __check_##type[1 - 2 * !(sizeof(type) == (e))]; \
(void)__check_##type; \
} while (0)
#define ALIGN_CHECK(type, a) \
STATIC_ASSERT(WT_ALIGN(sizeof(type), (a)) == sizeof(type))
static inline void
__wt_verify_build(void)
{
/* On-disk structures should not be padded. */
SIZE_CHECK(WT_BLOCK_DESC, WT_BLOCK_DESC_SIZE);
/*
* We mix-and-match 32-bit unsigned values and size_t's, mostly because
* we allocate and handle 32-bit objects, and lots of the underlying C
* library expects size_t values for the length of memory objects. We
* check, just to be sure.
*/
STATIC_ASSERT(sizeof(size_t) >= sizeof(uint32_t));
/*
* We require an off_t fit into an 8B chunk because 8B is the largest
* integral value we can encode into an address cookie.
*
* WiredTiger has never been tested on a system with 4B off_t types,
* disallow them for now.
*/
STATIC_ASSERT(sizeof(off_t) == sizeof(int64_t));
}
#undef ALIGN_CHECK
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