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libarchive: Test for Clang builtin before using it 

The __builtin_bswap16 builtin is not available on Clang 2.1.
This commit is contained in:
Brad King 2015-10-23 10:24:47 -04:00
parent 85e0bb84f5
commit 43d577dcb9
1 changed files with 4 additions and 1 deletions
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5
Utilities/cmlibarchive/libarchive/archive_read_support_format_lha.c
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@ -1712,10 +1712,13 @@ lha_crc16(uint16_t crc, const void *pp, size_t len)
for (;len >= 8; len -= 8) {
/* This if statement expects compiler optimization will
* remove the stament which will not be executed. */
#ifndef __has_builtin
# define __has_builtin(x) 0
#endif
#if defined(_MSC_VER) && _MSC_VER >= 1400 /* Visual Studio */
# define bswap16(x) _byteswap_ushort(x)
#elif (defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8) \
|| defined(__clang__)
|| (defined(__clang__) && __has_builtin(__builtin_bswap16))
# define bswap16(x) __builtin_bswap16(x)
#else
# define bswap16(x) ((((x) >> 8) & 0xff) | ((x) << 8))