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# defines HAVE_BYTESWAP
# optionally defines BYTESWAP_HEADER
# optionally defines BYTESWAP_32
#
# checks whether the following compiles:
# __builtin_bswap32(): defines HAVE_BUILTIN_BSWAP32
#
# else checks:
# byteswap.h: defines HAVE_BYTESWAP_H
# bswap_32() in byteswap.h: defines HAVE_BSWAP_32
#
# else checks:
# sys/endian.h: defines HAVE_SYS_ENDIAN_H
# bswap32() in sys/endian.h: defines HAVE_BSWAP32
#
include(TestBigEndian)
test_big_endian(WORDS_BIGENDIAN)
configure_define(WORDS_BIGENDIAN)
configure_define(HAVE_BYTESWAP)
configure_define_header(BYTESWAP_HEADER)
configure_define_literal(BYTESWAP_32)
check_c_source("
#include <stdint.h>
int main() {
uint32_t a = 1, b = __builtin_bswap32(a);
return b;
}"
HAVE_BUILTIN_BSWAP32
)
if(HAVE_BUILTIN_BSWAP32)
configure_undef(BYTESWAP_HEADER)
set(BYTESWAP_32 __builtin_bswap32 CACHE INTERNAL "BYTESWAP_32")
set(HAVE_BYTESWAP 1 CACHE INTERNAL "HAVE_BYTESWAP")
return()
endif()
check_include(byteswap.h)
check_symbol(bswap_32 byteswap.h)
if(HAVE_BSWAP_32)
if(HAVE_BYTESWAP_H)
set(BYTESWAP_HEADER byteswap.h CACHE INTERNAL "BYTESWAP_HEADER")
endif()
set(BYTESWAP_32 bswap_32 CACHE INTERNAL "BYTESWAP_32")
set(HAVE_BYTESWAP 1 CACHE INSTERNAL "HAVE_BYTESWAP")
return()
endif()
check_include(sys/endian.h)
check_symbol(bswap32 sys/endian.h)
if(HAVE_BSWAP32)
if(HAVE_SYS_ENDIAN_H)
set(BYTESWAP_HEADER sys/endian.h CACHE INTERNAL "BYTESWAP_HEADER")
endif()
set(BYTESWAP_32 bswap32 CACHE INTERNAL "BYTESWAP_32")
set(HAVE_BYTESWAP 1 CACHE INTERNAL "HAVE_BYTESWAP")
return()
endif()
configure_undef(BYTESWAP_HEADER)
configure_undef(BYTESWAP_32)
set(HAVE_BYTESWAP 0)
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