ObjFW  Check-in [975fa1d8f3]

])
test x"$have_asprintf" != x"yes" -a x"$ac_cv_snprintf_useful_ret" != x"yes" && \
	AC_MSG_ERROR(No asprintf and no snprintf returning required space!)

AC_CHECK_FUNCS([arc4random random], break)

AC_CHECK_LIB(dl, dlopen, LIBS="$LIBS -ldl")
AC_CHECK_HEADERS(dlfcn.h)
AC_CHECK_HEADERS_ONCE(dlfcn.h)
case "$host_os" in
	netbsd*)
		dnl dladdr exists on NetBSD, but it is completely broken.
		dnl When using it with code that uses __thread, it freezes the
		dnl process so that it has to be killed using SIGKILL.
		dnl When disabling __thread, it doesn't freeze, but all symbols
		dnl are wrong.

	AC_DEFINE(OF_HAVE_THREADS, 1, [Whether we have threads])
	AC_SUBST(USE_SRCS_THREADS, '${SRCS_THREADS}')

	AC_ARG_ENABLE(compiler-tls,
		AS_HELP_STRING([--disable-compiler-tls],
			[disable compiler thread local storage]))
	AS_IF([test x"$enable_compiler_tls" != x"no"], [
		AC_CHECK_HEADERS(threads.h, [
		AC_CHECK_HEADER(threads.h, [
			AC_DEFINE(OF_HAVE_THREADS_H, 1,
				[Whether we have threads.h])
		])

		AC_MSG_CHECKING(whether _Thread_local works)
		AC_TRY_LINK([
			static _Thread_local int x = 0;

	AC_CHECK_LIB(network, socket, LIBS="$LIBS -lnetwork")
	AC_CHECK_LIB(ws2_32, main, LIBS="$LIBS -lws2_32")

	AC_CHECK_HEADER(sys/socket.h, [
		AC_DEFINE(OF_HAVE_SYS_SOCKET_H, 1,
			[Whether we have sys/socket.h])
	])
	AC_CHECK_HEADERS(netinet/in.h, [
	AC_CHECK_HEADER(netinet/in.h, [
		AC_DEFINE(OF_HAVE_NETINET_IN_H, 1,
			[Whether we have netinet/in.h])
	])
	AC_CHECK_HEADERS(netinet/tcp.h, [
	AC_CHECK_HEADER(netinet/tcp.h, [
		AC_DEFINE(OF_HAVE_NETINET_TCP_H, 1,
			[Whether we have netinet/tcp.h])
	])
	AC_CHECK_HEADERS([arpa/inet.h netdb.h])

	AC_CHECK_FUNCS([paccept accept4])

		;;
esac
AS_IF([test x"$have_processes" = x"yes"], [
	AC_SUBST(OFPROCESS_M, "OFProcess.m")
	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
])

AC_CHECK_HEADERS([sys/ioctl.h sys/termios.h])
AC_CHECK_HEADERS_ONCE([sys/ioctl.h sys/termios.h])

AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
	AC_CHECK_HEADER(Foundation/NSObject.h, [
		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
		AC_SUBST(BRIDGE, "bridge")

		AS_IF([test x"$enable_shared" != x"no"], [