--- nono/configure.ac	2026/04/29 17:05:47	1.1.1.18
+++ nono/configure.ac	2026/04/29 17:05:56	1.1.1.20
@@ -98,6 +98,7 @@ AC_DEFUN([ADD_CXX_WARN_IF],[
 ])
 ADD_CXX_WARN_IF(-Wcast-qual)
 ADD_CXX_WARN_IF(-Wextra-semi)
+ADD_CXX_WARN_IF(-Wimplicit-fallthrough)
 ADD_CXX_WARN_IF(-Winconsistent-missing-destructor-override)
 ADD_CXX_WARN_IF(-Winconsistent-missing-override)
 ADD_CXX_WARN_IF(-Wlogical-op)
@@ -111,6 +112,8 @@ fi
 ADD_CXX_WARN_IF(-Wstring-conversion)
 ADD_CXX_WARN_IF(-Wsuggest-destructor-override)
 ADD_CXX_WARN_IF(-Wsuggest-override)
+# gcc14 が C++14 に対しても C++20 のエラーを出そうとする。は??
+ADD_CXX_WARN_IF(-Wno-template-id-cdtor)
 ADD_CXX_WARN_IF(-Wtype-limits)
 ADD_CXX_WARN_IF(-Wvla-extension)
 AC_SUBST([WARNFLAGS_CXX])
@@ -184,6 +187,7 @@ AS_IF([test x"${enable_neon}" != x"no"],
 # Checks for libraries.
 
 # Checks for header files.
+AC_CHECK_HEADERS([alsa/asoundlib.h])
 AC_CHECK_HEADERS([bsd/bsd.h])
 AC_CHECK_HEADERS([bsd/stdio.h])
 AC_CHECK_HEADERS([byteswap.h])
@@ -191,6 +195,8 @@ AC_CHECK_HEADERS([endian.h])
 AC_CHECK_HEADERS([kqueue/sys/event.h])
 AC_CHECK_HEADERS([pthread_np.h])
 AC_CHECK_HEADERS([sched.h])
+AC_CHECK_HEADERS([sndio.h])
+AC_CHECK_HEADERS([sys/audioio.h])
 AC_CHECK_HEADERS([sys/cpuset.h])
 AC_CHECK_HEADERS([sys/endian.h])
 AC_CHECK_HEADERS([sys/event.h])
@@ -622,6 +628,30 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
 		AC_MSG_RESULT([no])
 	])
 
+dnl HTOBE16(x) は x = htobe16(x) するもので、htobe16() とは別物。
+dnl ところが autoconf は小文字を大文字にした変数名を作る文化なので
+dnl こっちは INPLACE_HTOBE16 とかにしておく。
+AC_MSG_CHECKING(for HTOBE16)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+		#if defined(HAVE_ENDIAN_H)
+		#include <endian.h>
+		#endif
+		#if defined(HAVE_SYS_ENDIAN_H)
+		#include <sys/endian.h>
+		#endif
+		#if defined(HAVE_MACHINE_ENDIAN_H)
+		#include <machine/endian.h>
+		#endif
+	], [
+		uint16_t x = 0;
+		HTOBE16(x);
+	])], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE([HAVE_INPLACE_HTOBE16])
+	], [
+		AC_MSG_RESULT([no])
+	])
+
 AC_MSG_CHECKING(for CPU_COUNT)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
 		#if defined(HAVE_SCHED_H)
@@ -928,8 +958,10 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_HOSTNET_AFPACKET)
 		AC_SUBST(HOSTNET_AFPACKET, yes)
+		netdriver_afpacket=yes
 	], [
 		AC_MSG_RESULT(no)
+		netdriver_afpacket=no
 	])
 
 AC_MSG_CHECKING(for tap(4))
@@ -962,8 +994,10 @@ if test x"$ac_cv_header_net_bpf_h" = xye
 	AC_MSG_RESULT([yes])
 	AC_DEFINE([HAVE_HOSTNET_BPF])
 	AC_SUBST([HOSTNET_BPF], [yes])
+	netdriver_bpf=yes
 else
 	AC_MSG_RESULT([no])
+	netdriver_bpf=no
 fi
 
 #
@@ -1089,6 +1123,72 @@ AS_IF([test "x$with_libslirp" != "xno"],
 	AC_SUBST([HOSTNET_SLIRP], [no])
 ])
 
+# ALSA
+case "${host_os}" in
+ linux*)
+	default_alsa=yes
+	;;
+ *)
+	default_alsa=no
+	;;
+esac
+AC_ARG_WITH([alsa],
+	[AS_HELP_STRING([--with-alsa],
+		[enable ALSA support (default:yes on Linux, otherwise no)])],
+	[with_alsa=${withval}],
+	[with_alsa=${default_alsa}])
+sounddriver_alsa=no
+if test x"${with_alsa}" = xyes; then
+	AC_CHECK_LIB(asound, snd_pcm_open,
+		[has_asound=yes],
+		[has_asound=no])
+	if test x"${ac_cv_header_alsa_asoundlib_h}" = xyes -a \
+	        x"${ac_cv_lib_asound_snd_pcm_open}" = xyes; then
+		AC_DEFINE([HAVE_HOSTSOUND_ALSA])
+		AC_SUBST([HOSTSOUND_ALSA], [yes])
+		LIBS_SOUND="${LIBS_SOUND} -lasound"
+		sounddriver_alsa=yes
+	else
+		AC_MSG_ERROR([*** <alsa/asoundlib.h> or libasound not found.
+*** If you use Ubuntu, sudo apt install libasound2-dev.
+*** Or specify --without-alsa (it disables hostsound-driver=alsa).])
+	fi
+fi
+
+# NetBSD audio
+if test x"${ac_cv_header_sys_audioio_h}" = xyes; then
+	AC_MSG_CHECKING(for AUDIO_GETINFO)
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
+		#include <sys/ioctl.h>
+		#include <sys/audioio.h>
+		#include <unistd.h>
+	], [
+		struct audio_info info;
+		AUDIO_INITINFO(&info);
+		ioctl(0, AUDIO_GETINFO, &info);
+	])], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE([HAVE_HOSTSOUND_NETBSD])
+		AC_SUBST([HOSTSOUND_NETBSD], [yes])
+		sounddriver_netbsd=yes
+	], [
+		AC_MSG_RESULT([no])
+		sounddriver_netbsd=no
+	])
+fi
+
+# OpenBSD sndio
+if test x"${ac_cv_header_sndio_h}" = xyes; then
+	AC_DEFINE([HAVE_HOSTSOUND_SNDIO])
+	AC_SUBST([HOSTSOUND_SNDIO], [yes])
+	LIBS_SOUND="${LIBS_SOUND} -lsndio"
+	sounddriver_sndio=yes
+else
+	sounddriver_sndio=no
+fi
+
+AC_SUBST([LIBS_SOUND], [${LIBS_SOUND}])
+
 # wxWidgets
 AC_ARG_WITH([gui],
 	[AS_HELP_STRING([--without-gui], [disable GUI support])],
@@ -1197,3 +1297,32 @@ fi
 AC_CONFIG_FILES([Makefile.cfg])
 AC_CONFIG_HEADERS([config-nono.h])
 AC_OUTPUT
+
+# サマリを表示
+echo ""
+echo "Configuration summary:"
+echo -n "HostNet supports:			"
+if test x"$netdriver_afpacket" = xyes; then
+	echo -n " afpacket"
+fi
+if test x"$netdriver_bpf" = xyes; then
+	echo -n " bpf"
+fi
+if test x"$has_libslirp" = xyes; then
+	echo -n " slirp"
+fi
+if test x"$netdriver_tap" = xyes; then
+	echo -n " tap"
+fi
+echo ""
+echo -n "HostSound supports:			"
+if test x"$sounddriver_alsa" = xyes; then
+	echo -n " alsa"
+fi
+if test x"$sounddriver_netbsd" = xyes; then
+	echo -n " netbsd"
+fi
+if test x"$sounddriver_sndio" = xyes; then
+	echo -n " sndio"
+fi
+echo ""