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serialization: detect byteswap builtins without autoconf tests

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Rather than a complicated set of tests to decide which bswap functions to
use, always prefer the compiler built-ins when available.

These builtins and fallbacks can all be removed once we're using c++23, which
adds std::byteswap.
This commit is contained in:
Cory Fields
2024-02-27 18:29:24 +00:00
parent 297367b3bb
commit 432b18ca8d
4 changed files with 60 additions and 45 deletions
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7
configure.ac
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@@ -975,7 +975,7 @@ if test "$TARGET_OS" = "darwin"; then
AX_CHECK_LINK_FLAG([-Wl,-fixup_chains], [HARDENED_LDFLAGS="$HARDENED_LDFLAGS -Wl,-fixup_chains"], [], [$LDFLAG_WERROR])
fi
AC_CHECK_HEADERS([endian.h sys/endian.h byteswap.h sys/select.h sys/prctl.h sys/sysctl.h vm/vm_param.h sys/vmmeter.h sys/resources.h])
AC_CHECK_HEADERS([endian.h sys/endian.h sys/select.h sys/prctl.h sys/sysctl.h vm/vm_param.h sys/vmmeter.h sys/resources.h])
AC_CHECK_DECLS([getifaddrs, freeifaddrs],[CHECK_SOCKET],,
[#include <sys/types.h>
@@ -997,11 +997,6 @@ AC_CHECK_DECLS([le16toh, le32toh, le64toh, htole16, htole32, htole64, be16toh, b
#include <sys/endian.h>
#endif])
AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64],,,
[#if HAVE_BYTESWAP_H
#include <byteswap.h>
#endif])
AC_MSG_CHECKING([for __builtin_clzl])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
(void) __builtin_clzl(0);