Upon looking at sqlite ebuild(s) and comparing it with other distros I've noticed Gentoo doesn't set endianness configure flag. For example, Chimera Linux does it explicitly: github. com/chimera-linux/cports/blob/master/main/sqlite/template.py#L30#L33 I believe some endianness info should be available from profile? Reproducible: Always
AFAIK it does seem to wor kfine on big endian without this, but interesting that chimera needed it?
There is partial build-time detection of endianness (for some platforms) and fallback run-time detection of endianness, but I can set these macros manually in ebuild for potential minimally better performance on exotic platforms... src/sqliteInt.h: > /* > ** Macros to determine whether the machine is big or little endian, > ** 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_BYTEORDER=0 is set, then byte-order is determined > ** at run-time. > */ > #ifndef SQLITE_BYTEORDER > # 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(__ARMEL__) || defined(__AARCH64EL__) || defined(_M_ARM64) > # define SQLITE_BYTEORDER 1234 > # elif defined(sparc) || defined(__ppc__) || \ > defined(__ARMEB__) || defined(__AARCH64EB__) > # define SQLITE_BYTEORDER 4321 > # else > # define SQLITE_BYTEORDER 0 > # endif > #endif > #if SQLITE_BYTEORDER==4321 > # define SQLITE_BIGENDIAN 1 > # define SQLITE_LITTLEENDIAN 0 > # define SQLITE_UTF16NATIVE SQLITE_UTF16BE > #elif SQLITE_BYTEORDER==1234 > # define SQLITE_BIGENDIAN 0 > # define SQLITE_LITTLEENDIAN 1 > # define SQLITE_UTF16NATIVE SQLITE_UTF16LE > #else > # ifdef SQLITE_AMALGAMATION > const int sqlite3one = 1; > # else > extern const int sqlite3one; > # endif > # define SQLITE_BIGENDIAN (*(char *)(&sqlite3one)==0) > # define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1) > # define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE) > #endif src/util.c: > /* > ** Read or write a four-byte big-endian integer value. > */ > u32 sqlite3Get4byte(const u8 *p){ > #if SQLITE_BYTEORDER==4321 > u32 x; > memcpy(&x,p,4); > return x; > #elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000 > u32 x; > memcpy(&x,p,4); > return __builtin_bswap32(x); > #elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300 > u32 x; > memcpy(&x,p,4); > return _byteswap_ulong(x); > #else > testcase( p[0]&0x80 ); > return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3]; > #endif > } > void sqlite3Put4byte(unsigned char *p, u32 v){ > #if SQLITE_BYTEORDER==4321 > memcpy(p,&v,4); > #elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000 > u32 x = __builtin_bswap32(v); > memcpy(p,&x,4); > #elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300 > u32 x = _byteswap_ulong(v); > memcpy(p,&x,4); > #else > p[0] = (u8)(v>>24); > p[1] = (u8)(v>>16); > p[2] = (u8)(v>>8); > p[3] = (u8)v; > #endif > } ext/misc/shathree.c: > /* > ** Macros to determine whether the machine is big or little endian, > ** 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 > ** -DSHA3_BYTEORDER=0 is set, then byte-order is determined > ** at run-time. > */ > #ifndef SHA3_BYTEORDER > # 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__) > # define SHA3_BYTEORDER 1234 > # elif defined(sparc) || defined(__ppc__) > # define SHA3_BYTEORDER 4321 > # else > # define SHA3_BYTEORDER 0 > # endif > #endif > ... > /* > ** Initialize a new hash. iSize determines the size of the hash > ** in bits and should be one of 224, 256, 384, or 512. Or iSize > ** can be zero to use the default hash size of 256 bits. > */ > static void SHA3Init(SHA3Context *p, int iSize){ > memset(p, 0, sizeof(*p)); > if( iSize>=128 && iSize<=512 ){ > p->nRate = (1600 - ((iSize + 31)&~31)*2)/8; > }else{ > p->nRate = (1600 - 2*256)/8; > } > #if SHA3_BYTEORDER==1234 > /* Known to be little-endian at compile-time. No-op */ > #elif SHA3_BYTEORDER==4321 > p->ixMask = 7; /* Big-endian */ > #else > { > static unsigned int one = 1; > if( 1==*(unsigned char*)&one ){ > /* Little endian. No byte swapping. */ > p->ixMask = 0; > }else{ > /* Big endian. Byte swap. */ > p->ixMask = 7; > } > } > #endif > } > ...
