diff options
| -rw-r--r-- | SConstruct | 50 |
1 files changed, 26 insertions, 24 deletions
@@ -424,10 +424,27 @@ def CheckCompilerOption(context, option): context.Result(ret) return ret +def CheckEndian(context): + context.Message("checking endianess ... ") + import struct + array = struct.pack('cccc', '\x01', '\x02', '\x03', '\x04') + i = struct.unpack('i', array) + # Little Endian + if i == struct.unpack('<i', array): + context.Result("little") + return "little" + # Big Endian + elif i == struct.unpack('>i', array): + context.Result("big") + return "big" + context.Result("unknown") + return "unknown" + config = Configure(env, custom_tests = { 'CheckPKG' : CheckPKG, 'CheckExecutable' : CheckExecutable, 'CheckXsltproc' : CheckXsltproc, - 'CheckCompilerOption' : CheckCompilerOption}) + 'CheckCompilerOption' : CheckCompilerOption, + 'CheckEndian' : CheckEndian}) # If supported by the compiler, enable all warnings except uninitialized and @@ -600,30 +617,15 @@ if config.CheckFunc("pselect"): else: confdefs.append("#define COMPAT_SELECT\n") -confdefs.append(''' -/* will not handle pre-Intel Apples that can run big-endian - __BIG_ENDIAN__ and __LITTLE_ENDIAN__ are define in some gcc versions - only, probably depending on the architecture. Try to use endian.h if - the gcc way fails - endian.h also doesn not seem to be available on all - platforms. -*/ -#ifdef __BIG_ENDIAN__ -#define WORDS_BIGENDIAN 1 -#else /* __BIG_ENDIAN__ */ -#ifdef __LITTLE_ENDIAN__ -#undef WORDS_BIGENDIAN -#else -#include <endian.h> -#if __BYTE_ORDER == __BIG_ENDIAN -#define WORDS_BIGENDIAN 1 -#elif __BYTE_ORDER == __LITTLE_ENDIAN -#undef WORDS_BIGENDIAN -#else -#error "unable to determine endianess!" -#endif /* __BYTE_ORDER */ -#endif /* __LITTLE_ENDIAN__ */ -#endif /* __BIG_ENDIAN__ */ +endian = config.CheckEndian() +if endian == 'big': + confdefs.append("#define WORDS_BIGENDIAN 1\n") +elif endian == 'little': + confdefs.append("#undef WORDS_BIGENDIAN\n") +elif endian == 'unknown': + announce("processor endianness unknown") +confdefs.append('''\ /* Some libcs do not have strlcat/strlcpy. Local copies are provided */ #ifndef HAVE_STRLCAT # ifdef __cplusplus |