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annotate lib/portability.h @ 243:6d13d06ec0ac

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Might as well make the dependencies slightly more paranoid. (The only reason to have dependencies at all is so "make install" doesn't trigger a rebuild. A rebuild is always a build all anyway.)
author Rob Landley <rob@landley.net>
date Tue, 22 Jan 2008 19:20:06 -0600
parents 5f1d3ad8a888
children 9051cb744d0a
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1 // Humor glibc to get dprintf, then #define it to something more portable.
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2 #define _GNU_SOURCE
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3 #include <stdio.h>
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4 #define fdprintf(...) dprintf(__VA_ARGS__)
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5
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6 #ifdef __GNUC__
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7 #define noreturn __attribute__((noreturn))
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8 #else
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9 #define noreturn
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10 #endif
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11
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12 #ifndef __APPLE__
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13 #include <byteswap.h>
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14 #include <endian.h>
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16 #if __BYTE_ORDER == __BIG_ENDIAN
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17 #define IS_BIG_ENDIAN 1
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18 #else
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19 #define IS_BIG_ENDIAN 0
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20 #endif
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21
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22 #else
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23
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24 #ifdef __BIG_ENDIAN__
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25 #define IS_BIG_ENDIAN 1
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26 #else
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27 #define IS_BIG_ENDIAN 0
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28 #endif
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30 #endif
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31
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32 #if IS_BIG_ENDIAN
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33 #define IS_LITTLE_ENDIAN 0
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34 #define SWAP_BE16(x) (x)
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35 #define SWAP_BE32(x) (x)
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36 #define SWAP_BE64(x) (x)
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37 #define SWAP_LE16(x) bswap_16(x)
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38 #define SWAP_LE32(x) bswap_32(x)
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39 #define SWAP_LE64(x) bswap_64(x)
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40 #else
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41 #define IS_LITTLE_ENDIAN 1
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42 #define SWAP_BE16(x) bswap_16(x)
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43 #define SWAP_BE32(x) bswap_32(x)
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44 #define SWAP_BE64(x) bswap_64(x)
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45 #define SWAP_LE16(x) (x)
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46 #define SWAP_LE32(x) (x)
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47 #define SWAP_LE64(x) (x)
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48 #endif
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49
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50 // Some versions of gcc produce spurious "may be uninitialized" warnings in
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51 // cases where it provably can't happen. Unfortunately, although this warning
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52 // is calculated and produced separately from the "is definitely used
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53 // uninitialized" warnings, there's no way to turn off the broken spurious "may
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54 // be" warnings without also turning off the non-broken "is" warnings.
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55
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56 #if CFG_TOYBOX_DEBUG
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57 #define GCC_BUG =0
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58 #else
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59 #define GCC_BUG
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60 #endif