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Add the SQLITE_RUNTIME_BYTEORDER compile-time option to force SQLite to check

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the processor byte-order at run-time.  Add additional compile-time byte order
checks for ARM, PPC, and SPARC.

FossilOrigin-Name: 2c5363873a6f990a0abaacac6303acd46b48befc
This commit is contained in:
drh
2014-04-18 00:49:29 +00:00
parent 2cf4acbd9f
commit 71794dbaeb
3 changed files with 26 additions and 12 deletions
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24
src/sqliteInt.h
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@@ -546,21 +546,35 @@ typedef INT16_TYPE LogEst;
/*
** Macros to determine whether the machine is big or little endian,
** evaluated at runtime.
** and whether or not that determination is run-time or compile-time.
**
** For best performance, an attempt is made to guess at the byte-order
** using C-preprocessor macros. If that is unsuccessful, or if
** -DSQLITE_RUNTIME_BYTEORDER=1 is set, then byte-order is determined
** at run-time.
*/
#ifdef SQLITE_AMALGAMATION
const int sqlite3one = 1;
#else
extern const int sqlite3one;
#endif
#if defined(i386) || defined(__i386__) || defined(_M_IX86) \
|| defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) \
|| defined(_M_AMD64) || defined(_M_ARM) || defined(__x86)
#if (defined(i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || \
defined(_M_AMD64) || defined(_M_ARM) || defined(__x86) || \
defined(__arm__)) && !defined(SQLITE_RUNTIME_BYTEORDER)
# define SQLITE_BYTEORDER 1234
# define SQLITE_BIGENDIAN 0
# define SQLITE_LITTLEENDIAN 1
# define SQLITE_UTF16NATIVE SQLITE_UTF16LE
#else
#endif
#if (defined(sparc) || defined(__ppc__)) \
&& !defined(SQLITE_RUNTIME_BYTEORDER)
# define SQLITE_BYTEORDER 4321
# define SQLITE_BIGENDIAN 1
# define SQLITE_LITTLEENDIAN 0
# define SQLITE_UTF16NATIVE SQLITE_UTF16BE
#endif
#if !defined(SQLITE_BYTEORDER)
# define SQLITE_BYTEORDER 0 /* 0 means "unknown at compile-time" */
# define SQLITE_BIGENDIAN (*(char *)(&sqlite3one)==0)
# define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)