#
# Copyright (c) 2019 Brent Cook
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

AC_INIT([bgpq4], m4_esyscmd([tr -d '\n' < VERSION]), job@sobornost.net)

AC_CANONICAL_HOST
AM_INIT_AUTOMAKE([subdir-objects foreign])
AC_CONFIG_MACRO_DIR([m4])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AC_PROG_CC([cc gcc])

case $host_os in
	*darwin*)
		HOST_OS=darwin
		AC_DEFINE([SPT_TYPE], [SPT_REUSEARGV])
		;;
	*freebsd*)
		HOST_OS=freebsd
	;;
	*linux*)
		HOST_OS=linux
		CFLAGS="$CFLAGS -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_GNU_SOURCE"
		AC_DEFINE([SPT_TYPE], [SPT_REUSEARGV])
		;;
	*netbsd*)
		HOST_OS=netbsd
		;;
	*openbsd*)
		HOST_OS=openbsd
		AC_DEFINE([HAVE_ATTRIBUTE__BOUNDED__], [1], [OpenBSD has __bounded__])
		AC_DEFINE([HAVE_ATTRIBUTE__DEAD], [1], [OpenBSD has __dead])
		;;
	*solaris*)
		HOST_OS=solaris
		CFLAGS="$CFLAGS -D__EXTENSIONS__ -D_XOPEN_SOURCE=600 -DBSD_COMP"
		;;
	*) ;;
esac

AM_CONDITIONAL([HOST_DARWIN],  [test x$HOST_OS = xdarwin])
AM_CONDITIONAL([HOST_FREEBSD], [test x$HOST_OS = xfreebsd])
AM_CONDITIONAL([HOST_LINUX],   [test x$HOST_OS = xlinux])
AM_CONDITIONAL([HOST_NETBSD],  [test x$HOST_OS = xnetbsd])
AM_CONDITIONAL([HOST_SOLARIS], [test x$HOST_OS = xsolaris])

AC_PROG_CC
AC_PROG_CC_STDC
AM_PROG_CC_C_O
AC_PROG_LIBTOOL
AC_PROG_INSTALL

AC_ARG_ENABLE(warnings,
	AS_HELP_STRING([--disable-warnings],
	    [ enable compiler warnings [default=enabled]]),
	[case $enableval in
	    yes) enable_warnings=yes;;
	    no) enable_warnings=no;;
	    *) enable_warnings=yes;; esac],
    enable_warnings=yes)

if test "$enable_warnings" = yes; then
	AM_CFLAGS="$AM_CFLAGS -Wall -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wshadow -Wpointer-arith -Wsign-compare -Werror-implicit-function-declaration"
	save_cflags="$CFLAGS"
	CFLAGS=-Wno-pointer-sign
	AC_MSG_CHECKING([whether CC supports -Wno-pointer-sign])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
	    [AC_MSG_RESULT([yes])]
	    [WARN_CFLAGS=-Wno-pointer-sign],
	    [AC_MSG_RESULT([no])]
	)
	AM_CFLAGS="$AM_CFLAGS $WARN_CFLAGS"
	CFLAGS="$save_cflags"
fi

AC_MSG_CHECKING([if compiling with clang])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
#ifndef __clang__
	not clang
#endif
	]])],
	[AC_MSG_RESULT([yes])]
	[CLANG_FLAGS=-Qunused-arguments],
	[AC_MSG_RESULT([no])]
)
AM_CFLAGS="$AM_CFLAGS $CLANG_FLAGS"
AM_LDFLAGS="$LDFLAGS $CLANG_FLAGS"
AC_SUBST(AM_CFLAGS)
AC_SUBST(AM_LDFLAGS)

AC_CHECK_FUNCS(strlcpy)
AC_CHECK_FUNCS(pledge)

AC_CHECK_LIB(socket,socket)
AC_CHECK_LIB(nsl,getaddrinfo)

AC_CHECK_HEADERS([sys/cdefs.h sys/queue.h sys/tree.h sys/select.h])

AM_CONDITIONAL([HAVE_STRLCPY], [test "x$ac_cv_func_strlcpy" = xyes])

AC_CONFIG_FILES([
	Makefile
	include/Makefile
	compat/Makefile
])

AC_OUTPUT