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annotate lib/portability.h @ 94:884c03c29f21

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Teach build to build only the toys/*.c selected in .config, and teach CFG_TOYSH_DEBUG to shut up the spurious "gcc can't tell that this is never actually used uninitialized because gcc is stupid" warnings.
author Rob Landley <rob@landley.net>
date Sat, 03 Feb 2007 14:10:00 -0500
parents 69efffcacd70
children c3d1d74d5d8f
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69efffcacd70 Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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1
69efffcacd70 Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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2 // Humor glibc to get dprintf, then #define it to something more portable.
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3 #define _GNU_SOURCE
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4 #include <stdio.h>
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5 #define fdprintf(...) dprintf(__VA_ARGS__)
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7 #include <endian.h>
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9 #if __BYTE_ORDER == __BIG_ENDIAN
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10 #define IS_BIG_ENDIAN 1
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11 #define IS_LITTLE_ENDIAN 0
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12 #define SWAP_BE16(x) (x)
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13 #define SWAP_BE32(x) (x)
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14 #define SWAP_BE64(x) (x)
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15 #define SWAP_LE16(x) bswap_16(x)
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16 #define SWAP_LE32(x) bswap_32(x)
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17 #define SWAP_LE64(x) bswap_64(x)
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18 #else
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19 #define IS_LITTLE_ENDIAN 1
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20 #define IS_BIG_ENDIAN 0
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21 #define SWAP_BE16(x) bswap_16(x)
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22 #define SWAP_BE32(x) bswap_32(x)
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23 #define SWAP_BE64(x) bswap_64(x)
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24 #define SWAP_LE16(x) (x)
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25 #define SWAP_LE32(x) (x)
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26 #define SWAP_LE64(x) (x)
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27 #endif
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29 // Some versions of gcc produce spurious "may be uninitialized" warnings in
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30 // cases where it provably can't happen. Unfortunately, although this warning
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31 // is calculated and produced separately from the "is definitely used
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32 // uninitialized" warnings, there's no way to turn off the broken spurious "may
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33 // be" warnings without also turning off the non-broken "is" warnings.
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35 #if CFG_TOYBOX_DEBUG
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36 #define GCC_BUG =0
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37 #else
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38 #define GCC_BUG
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39 #endif