c++tools/configure.ac - gcc - Git at Google

 # Configure script for c++tools
 #   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #   Written by Nathan Sidwell <nathan@acm.org> while at FaceBook
 #
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; see the file COPYING3.  If not see
 # <http://www.gnu.org/licenses/>.

 # C++ has grown a C++20 mapper server.  This may be used to provide
 # and/or learn and/or build required modules.  This sample server
 # shows how the protocol introduced by wg21.link/p1184 may be used.
 # By default g++ uses an in-process mapper.

 sinclude(../config/acx.m4)
 sinclude(../config/ax_lib_socket_nsl.m4)

 AC_INIT(c++tools)

 AC_CONFIG_SRCDIR([server.cc])

 # Determine the noncanonical names used for directories.
 ACX_NONCANONICAL_TARGET

 AC_CANONICAL_SYSTEM
 AC_PROG_INSTALL
 test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
 AC_SUBST(INSTALL_PROGRAM)

 AC_PROG_CXX
 MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
 AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
 AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])

 AC_LANG(C++)

 dnl Enabled by default
 AC_MSG_CHECKING([whether to build C++ tools])
   AC_ARG_ENABLE(c++-tools,
     [AS_HELP_STRING([--enable-c++-tools],
 		    [build auxiliary c++ tools])],
       cxx_aux_tools=$enableval,
       cxx_aux_tools=yes)

 AC_MSG_RESULT($cxx_aux_tools)
 CXX_AUX_TOOLS="$cxx_aux_tools"
 AC_SUBST(CXX_AUX_TOOLS)

 AC_ARG_ENABLE([maintainer-mode],
 AS_HELP_STRING([--enable-maintainer-mode],
 [enable maintainer mode.  Add rules to rebuild configurey bits]),,
 [enable_maintainer_mode=no])
 case "$enable_maintainer_mode" in
   yes) maintainer_mode=yes ;;
   no) maintainer_mode=no ;;
   *) AC_MSG_ERROR([unknown maintainer mode $enable_maintainer_mode]) ;;
 esac
 AC_MSG_CHECKING([maintainer-mode])
 AC_MSG_RESULT([$maintainer_mode])
 test "$maintainer_mode" = yes && MAINTAINER=yes
 AC_SUBST(MAINTAINER)

 # Handle configuration of checking; for the tools in this directory we
 # default to release checking and stricter checks do not change this.

 AC_ARG_ENABLE(checking,
 [AS_HELP_STRING([[--enable-checking[=LIST]]],
 		[enable expensive run-time checks.  With LIST,
 		 enable only specific categories of checks.
 		 Categories are: yes,no,all,none,release.])],
 [ac_checking_flags="${enableval}"],[
 # Default to checking.
 ac_checking_flags=yes
 ])
 IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS="$IFS,"
 for check in release $ac_checking_flags
 do
 	case $check in
 	# these set all the flags to specific states
 	yes|all|release|assert) ac_assert_checking=1 ; ;;
 	no|none) ac_assert_checking= ; ;;
 	*) ;;
 	esac
 done
 IFS="$ac_save_IFS"

 if test x$ac_assert_checking != x ; then
   AC_DEFINE(ENABLE_ASSERT_CHECKING, 1,
 [Define if you want assertions enabled.  This is a cheap check.])
 fi

 # Check whether --enable-default-pie was given.
 AC_ARG_ENABLE(default-pie,
 [AS_HELP_STRING([--enable-default-pie],
 		  [enable Position Independent Executable as default])],
 [PIEFLAG=-fPIE], [PIEFLAG=])
 AC_SUBST([PIEFLAG])

 # Check if O_CLOEXEC is defined by fcntl
 AC_CACHE_CHECK(for O_CLOEXEC, ac_cv_o_cloexec, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <fcntl.h>]], [[
 return open ("/dev/null", O_RDONLY | O_CLOEXEC);]])],
 [ac_cv_o_cloexec=yes],[ac_cv_o_cloexec=no])])
 if test $ac_cv_o_cloexec = yes; then
   AC_DEFINE(HOST_HAS_O_CLOEXEC, 1,
   [Define if O_CLOEXEC supported by fcntl.])
 fi

 AC_CHECK_HEADERS(sys/mman.h)

 # C++ Modules would like some networking features to provide the mapping
 # server.  You can still use modules without them though.
 # The following network-related checks could probably do with some
 # Windows and other non-linux defenses and checking.

 # Local socket connectivity wants AF_UNIX networking
 # Check for AF_UNIX networking
 AC_CACHE_CHECK(for AF_UNIX, ac_cv_af_unix, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/in.h>]],[[
 sockaddr_un un;
 un.sun_family = AF_UNSPEC;
 int fd = socket (AF_UNIX, SOCK_STREAM, 0);
 connect (fd, (sockaddr *)&un, sizeof (un));]])],
 [ac_cv_af_unix=yes],
 [ac_cv_af_unix=no])])
 if test $ac_cv_af_unix = yes; then
   AC_DEFINE(HAVE_AF_UNIX, 1,
   [Define if AF_UNIX supported.])
 fi

 # Remote socket connectivity wants AF_INET6 networking
 # Check for AF_INET6 networking
 AC_CACHE_CHECK(for AF_INET6, ac_cv_af_inet6, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netdb.h>]],[[
 sockaddr_in6 in6;
 in6.sin6_family = AF_UNSPEC;
 struct addrinfo *addrs = 0;
 struct addrinfo hints;
 hints.ai_flags = 0;
 hints.ai_family = AF_INET6;
 hints.ai_socktype = SOCK_STREAM;
 hints.ai_protocol = 0;
 hints.ai_canonname = 0;
 hints.ai_addr = 0;
 hints.ai_next = 0;
 int e = getaddrinfo ("localhost", 0, &hints, &addrs);
 const char *str = gai_strerror (e);
 freeaddrinfo (addrs);
 int fd = socket (AF_INET6, SOCK_STREAM, 0);
 connect (fd, (sockaddr *)&in6, sizeof (in6));]])],
 [ac_cv_af_inet6=yes],
 [ac_cv_af_inet6=no])])
 if test $ac_cv_af_inet6 = yes; then
   AC_DEFINE(HAVE_AF_INET6, 1,
   [Define if AF_INET6 supported.])
 fi

 # Efficient server response wants epoll
 # Check for epoll_create, epoll_ctl, epoll_pwait
 AC_CACHE_CHECK(for epoll, ac_cv_epoll, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <sys/epoll.h>]],[[
 int fd = epoll_create (1);
 epoll_event ev;
 ev.events = EPOLLIN;
 ev.data.fd = 0;
 epoll_ctl (fd, EPOLL_CTL_ADD, 0, &ev);
 epoll_pwait (fd, 0, 0, -1, 0);]])],
 [ac_cv_epoll=yes],
 [ac_cv_epoll=no])])
 if test $ac_cv_epoll = yes; then
   AC_DEFINE(HAVE_EPOLL, 1,
   [Define if epoll_create, epoll_ctl, epoll_pwait provided.])
 fi

 # If we can't use epoll, try pselect.
 # Check for pselect
 AC_CACHE_CHECK(for pselect, ac_cv_pselect, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <sys/select.h>]],[[
 pselect (0, 0, 0, 0, 0, 0);]])],
 [ac_cv_pselect=yes],
 [ac_cv_pselect=no])])
 if test $ac_cv_pselect = yes; then
   AC_DEFINE(HAVE_PSELECT, 1,
   [Define if pselect provided.])
 fi

 # And failing that, use good old select.
 # If we can't even use this, the server is serialized.
 # Check for select
 AC_CACHE_CHECK(for select, ac_cv_select, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <sys/select.h>]],[[
 select (0, 0, 0, 0, 0);]])],
 [ac_cv_select=yes],
 [ac_cv_select=no])])
 if test $ac_cv_select = yes; then
   AC_DEFINE(HAVE_SELECT, 1,
   [Define if select provided.])
 fi

 # Avoid some fnctl calls by using accept4, when available.
 # Check for accept4
 AC_CACHE_CHECK(for accept4, ac_cv_accept4, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <sys/socket.h>]],[[
 int err = accept4 (1, 0, 0, SOCK_NONBLOCK);]])],
 [ac_cv_accept4=yes],
 [ac_cv_accept4=no])])
 if test $ac_cv_accept4 = yes; then
   AC_DEFINE(HAVE_ACCEPT4, 1,
   [Define if accept4 provided.])
 fi

 # For better server messages, look for a way to stringize network addresses
 # Check for inet_ntop
 AC_CACHE_CHECK(for inet_ntop, ac_cv_inet_ntop, [
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #include <arpa/inet.h>
 #include <netinet/in.h>]],[[
 sockaddr_in6 in6;
 char buf[INET6_ADDRSTRLEN];
 const char *str = inet_ntop (AF_INET6, &in6, buf, sizeof (buf));]])],
 [ac_cv_inet_ntop=yes],
 [ac_cv_inet_ntop=no])])
 if test $ac_cv_inet_ntop = yes; then
   AC_DEFINE(HAVE_INET_NTOP, 1,
   [Define if inet_ntop provided.])
 fi

 # Determine what GCC version number to use in filesystem paths.
 GCC_BASE_VER

 # Solaris needs libsocket and libnsl for socket functions before 11.4.
 # libcody uses those.
 save_LIBS="$LIBS"
 LIBS=
 AX_LIB_SOCKET_NSL
 NETLIBS="$LIBS"
 LIBS="$save_LIBS"
 AC_SUBST(NETLIBS)

 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_FILES([Makefile])

 AC_OUTPUT
	# Configure script for c++tools
	# Copyright (C) 2020-2021 Free Software Foundation, Inc.
	# Written by Nathan Sidwell <nathan@acm.org> while at FaceBook
	#
	# This file is free software; you can redistribute it and/or modify it
	# under the terms of the GNU General Public License as published by
	# the Free Software Foundation; either version 3 of the License, or
	# (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful, but
	# WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	# General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program; see the file COPYING3. If not see
	# <http://www.gnu.org/licenses/>.

	# C++ has grown a C++20 mapper server. This may be used to provide
	# and/or learn and/or build required modules. This sample server
	# shows how the protocol introduced by wg21.link/p1184 may be used.
	# By default g++ uses an in-process mapper.

	sinclude(../config/acx.m4)
	sinclude(../config/ax_lib_socket_nsl.m4)

	AC_INIT(c++tools)

	AC_CONFIG_SRCDIR([server.cc])

	# Determine the noncanonical names used for directories.
	ACX_NONCANONICAL_TARGET

	AC_CANONICAL_SYSTEM
	AC_PROG_INSTALL
	test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
	AC_SUBST(INSTALL_PROGRAM)

	AC_PROG_CXX
	MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
	AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
	AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])

	AC_LANG(C++)

	dnl Enabled by default
	AC_MSG_CHECKING([whether to build C++ tools])
	AC_ARG_ENABLE(c++-tools,
	[AS_HELP_STRING([--enable-c++-tools],
	[build auxiliary c++ tools])],
	cxx_aux_tools=$enableval,
	cxx_aux_tools=yes)

	AC_MSG_RESULT($cxx_aux_tools)
	CXX_AUX_TOOLS="$cxx_aux_tools"
	AC_SUBST(CXX_AUX_TOOLS)

	AC_ARG_ENABLE([maintainer-mode],
	AS_HELP_STRING([--enable-maintainer-mode],
	[enable maintainer mode. Add rules to rebuild configurey bits]),,
	[enable_maintainer_mode=no])
	case "$enable_maintainer_mode" in
	yes) maintainer_mode=yes ;;
	no) maintainer_mode=no ;;
	*) AC_MSG_ERROR([unknown maintainer mode $enable_maintainer_mode]) ;;
	esac
	AC_MSG_CHECKING([maintainer-mode])
	AC_MSG_RESULT([$maintainer_mode])
	test "$maintainer_mode" = yes && MAINTAINER=yes
	AC_SUBST(MAINTAINER)

	# Handle configuration of checking; for the tools in this directory we
	# default to release checking and stricter checks do not change this.

	AC_ARG_ENABLE(checking,
	[AS_HELP_STRING([[--enable-checking[=LIST]]],
	[enable expensive run-time checks. With LIST,
	enable only specific categories of checks.
	Categories are: yes,no,all,none,release.])],
	[ac_checking_flags="${enableval}"],[
	# Default to checking.
	ac_checking_flags=yes
	])
	IFS="${IFS= }"; ac_save_IFS="$IFS"; IFS="$IFS,"
	for check in release $ac_checking_flags
	do
	case $check in
	# these set all the flags to specific states
	yes\|all\|release\|assert) ac_assert_checking=1 ; ;;
	no\|none) ac_assert_checking= ; ;;
	*) ;;
	esac
	done
	IFS="$ac_save_IFS"

	if test x$ac_assert_checking != x ; then
	AC_DEFINE(ENABLE_ASSERT_CHECKING, 1,
	[Define if you want assertions enabled. This is a cheap check.])
	fi

	# Check whether --enable-default-pie was given.
	AC_ARG_ENABLE(default-pie,
	[AS_HELP_STRING([--enable-default-pie],
	[enable Position Independent Executable as default])],
	[PIEFLAG=-fPIE], [PIEFLAG=])
	AC_SUBST([PIEFLAG])

	# Check if O_CLOEXEC is defined by fcntl
	AC_CACHE_CHECK(for O_CLOEXEC, ac_cv_o_cloexec, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <fcntl.h>]], [[
	return open ("/dev/null", O_RDONLY \| O_CLOEXEC);]])],
	[ac_cv_o_cloexec=yes],[ac_cv_o_cloexec=no])])
	if test $ac_cv_o_cloexec = yes; then
	AC_DEFINE(HOST_HAS_O_CLOEXEC, 1,
	[Define if O_CLOEXEC supported by fcntl.])
	fi

	AC_CHECK_HEADERS(sys/mman.h)

	# C++ Modules would like some networking features to provide the mapping
	# server. You can still use modules without them though.
	# The following network-related checks could probably do with some
	# Windows and other non-linux defenses and checking.

	# Local socket connectivity wants AF_UNIX networking
	# Check for AF_UNIX networking
	AC_CACHE_CHECK(for AF_UNIX, ac_cv_af_unix, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#include <netinet/in.h>]],[[
	sockaddr_un un;
	un.sun_family = AF_UNSPEC;
	int fd = socket (AF_UNIX, SOCK_STREAM, 0);
	connect (fd, (sockaddr *)&un, sizeof (un));]])],
	[ac_cv_af_unix=yes],
	[ac_cv_af_unix=no])])
	if test $ac_cv_af_unix = yes; then
	AC_DEFINE(HAVE_AF_UNIX, 1,
	[Define if AF_UNIX supported.])
	fi

	# Remote socket connectivity wants AF_INET6 networking
	# Check for AF_INET6 networking
	AC_CACHE_CHECK(for AF_INET6, ac_cv_af_inet6, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	#include <netdb.h>]],[[
	sockaddr_in6 in6;
	in6.sin6_family = AF_UNSPEC;
	struct addrinfo *addrs = 0;
	struct addrinfo hints;
	hints.ai_flags = 0;
	hints.ai_family = AF_INET6;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = 0;
	hints.ai_canonname = 0;
	hints.ai_addr = 0;
	hints.ai_next = 0;
	int e = getaddrinfo ("localhost", 0, &hints, &addrs);
	const char *str = gai_strerror (e);
	freeaddrinfo (addrs);
	int fd = socket (AF_INET6, SOCK_STREAM, 0);
	connect (fd, (sockaddr *)&in6, sizeof (in6));]])],
	[ac_cv_af_inet6=yes],
	[ac_cv_af_inet6=no])])
	if test $ac_cv_af_inet6 = yes; then
	AC_DEFINE(HAVE_AF_INET6, 1,
	[Define if AF_INET6 supported.])
	fi

	# Efficient server response wants epoll
	# Check for epoll_create, epoll_ctl, epoll_pwait
	AC_CACHE_CHECK(for epoll, ac_cv_epoll, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/epoll.h>]],[[
	int fd = epoll_create (1);
	epoll_event ev;
	ev.events = EPOLLIN;
	ev.data.fd = 0;
	epoll_ctl (fd, EPOLL_CTL_ADD, 0, &ev);
	epoll_pwait (fd, 0, 0, -1, 0);]])],
	[ac_cv_epoll=yes],
	[ac_cv_epoll=no])])
	if test $ac_cv_epoll = yes; then
	AC_DEFINE(HAVE_EPOLL, 1,
	[Define if epoll_create, epoll_ctl, epoll_pwait provided.])
	fi

	# If we can't use epoll, try pselect.
	# Check for pselect
	AC_CACHE_CHECK(for pselect, ac_cv_pselect, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/select.h>]],[[
	pselect (0, 0, 0, 0, 0, 0);]])],
	[ac_cv_pselect=yes],
	[ac_cv_pselect=no])])
	if test $ac_cv_pselect = yes; then
	AC_DEFINE(HAVE_PSELECT, 1,
	[Define if pselect provided.])
	fi

	# And failing that, use good old select.
	# If we can't even use this, the server is serialized.
	# Check for select
	AC_CACHE_CHECK(for select, ac_cv_select, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/select.h>]],[[
	select (0, 0, 0, 0, 0);]])],
	[ac_cv_select=yes],
	[ac_cv_select=no])])
	if test $ac_cv_select = yes; then
	AC_DEFINE(HAVE_SELECT, 1,
	[Define if select provided.])
	fi

	# Avoid some fnctl calls by using accept4, when available.
	# Check for accept4
	AC_CACHE_CHECK(for accept4, ac_cv_accept4, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/socket.h>]],[[
	int err = accept4 (1, 0, 0, SOCK_NONBLOCK);]])],
	[ac_cv_accept4=yes],
	[ac_cv_accept4=no])])
	if test $ac_cv_accept4 = yes; then
	AC_DEFINE(HAVE_ACCEPT4, 1,
	[Define if accept4 provided.])
	fi

	# For better server messages, look for a way to stringize network addresses
	# Check for inet_ntop
	AC_CACHE_CHECK(for inet_ntop, ac_cv_inet_ntop, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <arpa/inet.h>
	#include <netinet/in.h>]],[[
	sockaddr_in6 in6;
	char buf[INET6_ADDRSTRLEN];
	const char *str = inet_ntop (AF_INET6, &in6, buf, sizeof (buf));]])],
	[ac_cv_inet_ntop=yes],
	[ac_cv_inet_ntop=no])])
	if test $ac_cv_inet_ntop = yes; then
	AC_DEFINE(HAVE_INET_NTOP, 1,
	[Define if inet_ntop provided.])
	fi

	# Determine what GCC version number to use in filesystem paths.
	GCC_BASE_VER

	# Solaris needs libsocket and libnsl for socket functions before 11.4.
	# libcody uses those.
	save_LIBS="$LIBS"
	LIBS=
	AX_LIB_SOCKET_NSL
	NETLIBS="$LIBS"
	LIBS="$save_LIBS"
	AC_SUBST(NETLIBS)

	AC_CONFIG_HEADERS([config.h])
	AC_CONFIG_FILES([Makefile])

	AC_OUTPUT