diff options
Diffstat (limited to 'extract.h')
| -rw-r--r-- | extract.h | 14 |
1 files changed, 8 insertions, 6 deletions
@@ -24,6 +24,7 @@ #endif #include <pcap/pcap-inttypes.h> +#include <pcap/compiler-tests.h> /* * Macros to extract possibly-unaligned big-endian integral values. @@ -32,15 +33,16 @@ /* * The processor doesn't natively handle unaligned loads. */ -#if defined(__GNUC__) && defined(HAVE___ATTRIBUTE__) && \ +#if PCAP_IS_AT_LEAST_GNUC_VERSION(2,0) && \ (defined(__alpha) || defined(__alpha__) || \ defined(__mips) || defined(__mips__)) - /* - * This is a GCC-compatible compiler and we have __attribute__, which - * we assume that mean we have __attribute__((packed)), and this is - * MIPS or Alpha, which has instructions that can help when doing - * unaligned loads. + * This is MIPS or Alpha, which don't natively handle unaligned loads, + * but which have instructions that can help when doing unaligned + * loads, and this is GCC 2.0 or later or a compiler that claims to + * be GCC 2.0 or later, which we assume that mean we have + * __attribute__((packed)), which we can use to convince the compiler + * to generate those instructions. * * Declare packed structures containing a uint16_t and a uint32_t, * cast the pointer to point to one of those, and fetch through it; |