5 # defines HAVE_BYTESWAP
6 # optionally defines BYTESWAP_HEADER
7 # optionally defines BYTESWAP_32
9 # checks whether the following compiles:
10 # __builtin_bswap32(): defines HAVE_BUILTIN_BSWAP32
13 # byteswap.h: defines HAVE_BYTESWAP_H
14 # bswap_32() in byteswap.h: defines HAVE_BSWAP_32
17 # sys/endian.h: defines HAVE_SYS_ENDIAN_H
18 # bswap32() in sys/endian.h: defines HAVE_BSWAP32
20 function(check_byteswap)
22 check_compiles(HAVE_BUILTIN_BSWAP32 "uint32_t a, b = __builtin_bswap32(a);" stdint.h)
24 if(HAVE_BUILTIN_BSWAP32)
25 unset(BYTESWAP_HEADER PARENT_SCOPE)
26 set(BYTESWAP_32 __builtin_bswap32 PARENT_SCOPE)
27 set(HAVE_BYTESWAP 1 PARENT_SCOPE)
31 check_header(byteswap.h)
32 check_decl(bswap_32 byteswap.h)
36 set(BYTESWAP_HEADER byteswap.h PARENT_SCOPE)
38 set(BYTESWAP_32 bswap_32 PARENT_SCOPE)
39 set(HAVE_BYTESWAP 1 PARENT_SCOPE)
43 check_header(sys/endian.h)
44 check_decl(bswap32 sys/endian.h)
48 set(BYTESWAP_HEADER sys/endian.h PARENT_SCOPE)
50 set(BYTESWAP_32 bswap32 PARENT_SCOPE)
51 set(HAVE_BYTESWAP 1 PARENT_SCOPT)
55 unset(BYTESWAP_HEADER PARENT_SCOPE)
56 unset(BYTESWAP_32 PARENT_SCOPE)
57 set(HAVE_BYTESWAP 0 PARENT_SCOPE)