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# Process this file with autoconf to produce a configure script.
#
# Copyright (C) 2013, 2017, 2019, 2021  P. J. McDermott
#
# This file is part of @
#
# @ 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.
#
# @ 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 @.  If not, see <http://www.gnu.org/licenses/>.

AC_INIT([@], [1.0.0], [mailto:pj@pehjota.net], [atsign])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_SRCDIR([src/main.c])

AM_INIT_AUTOMAKE([gnu check-news dist-bzip2 dist-xz subdir-objects])
AM_SILENT_RULES([yes])

AM_CONDITIONAL([IN_GIT],
	[test -d "${srcdir}/.git" && command -v git >/dev/null 2>&1])

AM_CONDITIONAL([OUT_OF_TREE], [test x"${srcdir}" != x'.' ])

AM_CONDITIONAL([CROSS_COMPILING], [! test x"${build_alias}" = x"${host_alias}"])

save_CFLAGS="${CFLAGS-}"
AC_PROG_CC()
AM_PROG_CC_C_O()
test -d "${srcdir}/.git" || CFLAGS="${save_CFLAGS}"

funcs_missing=false
AC_CHECK_FUNCS(
	[\
		calloc difftime fprintf fputs free isspace localtime mktime \
		printf realloc setvbuf sleep strerror strlen strftime strptime \
		time timegm
	],
	[],
	[funcs_missing=true])
AC_CHECK_FUNCS(
	[getopt_long],
	[],
	[
		AC_CHECK_FUNCS([getopt], [], [funcs_missing=true])
	])
if ${funcs_missing}; then
	AC_MSG_ERROR([required functions are missing])
fi

AC_ARG_ENABLE([tests],
	[AS_HELP_STRING([--enable-tests],
		[include test suite support in executable])],
	[case "${enableval}" in yes|no) tests=${enableval};;
		*) AC_MSG_ERROR(
			[bad value ${enableval} for tests option]);;
	esac],
	[
		tests=no
		test -d "${srcdir}/.git" && tests=yes
	]
)
if test x"${tests}" = x'yes'; then
	AC_DEFINE([ENABLE_TESTS], [1],
		[Define to 1 to include test suite support])
	AC_CHECK_FUNCS(
		[sscanf],
		[],
		[AC_MSG_ERROR([required functions are missing])])
else
	AC_DEFINE([ENABLE_TESTS], [0],
		[Define to 1 to include test suite support])
fi
AM_CONDITIONAL([ENABLE_TESTS], [test x"${tests}" = x'yes'])

AX_CFLAGS_WARN_ALL()  dnl Adds -Wall or equivalent
AX_CHECK_COMPILE_FLAG([-Wpedantic], [AX_APPEND_FLAG([-Wpedantic])])
AX_CHECK_COMPILE_FLAG([-Wextra],    [AX_APPEND_FLAG([-Wextra])])

AC_ARG_ENABLE([gcc-warnings],
	[AS_HELP_STRING([--enable-gcc-warnings], [turn on many GCC warnings])],
	[case "${enableval}" in yes|no) gcc_warnings=${enableval};;
		*) AC_MSG_ERROR(
			[bad value ${enableval} for gcc-warnings option]);;
	esac],
	[
		gcc_warnings=no
		test -d "${srcdir}/.git" && gcc_warnings=yes
	]
)
if test "x${gcc_warnings}" = 'xyes'; then
	nowarns=''
	nowarns="${nowarns} -Wsystem-headers"
	gl_MANYWARN_ALL_GCC([warns])
	gl_MANYWARN_COMPLEMENT([warns], [${warns}], [${nowarns}])
	for warn in ${warns}; do
		gl_WARN_ADD([${warn}])
	done
	AC_SUBST([WARN_CFLAGS])
fi

AX_CHECK_COMPILE_FLAG([-fdiagnostics-color=auto],
	[AX_APPEND_FLAG([-fdiagnostics-color=auto])])

AC_ARG_ENABLE([address-sanitization],
	[AS_HELP_STRING([--enable-address-sanitization],
		[turn on AddressSanitizer (if available)])],
	[case "${enableval}" in yes|no) address_sanitization=${enableval};;
		*) AC_MSG_ERROR(
			[bad value ${enableval} for address-sanitization option]
			);;
	esac],
	[
		address_sanitization=no
		gl_GCC_VERSION_IFELSE([4], [8],
			[test -d "${srcdir}/.git" && address_sanitization=yes])
	]
)
if test "x${address_sanitization}" = 'xyes'; then
	AX_CHECK_COMPILE_FLAG([-fsanitize=address],
		[AX_APPEND_FLAG([-fsanitize=address], [ASAN_CFLAGS])])
	AX_CHECK_COMPILE_FLAG([-fno-omit-frame-pointer],
		[AX_APPEND_FLAG([-fno-omit-frame-pointer], [ASAN_CFLAGS])])
	AC_SUBST([ASAN_CFLAGS])
fi

if ! test -d "${srcdir}/.git"; then
	AX_CHECK_COMPILE_FLAG([-s], [AX_APPEND_FLAG([-s])])
fi
for flag in -Os -fno-unwind-tables -fno-asynchronous-unwind-tables \
		-ffunction-sections -fdata-sections -Wl,--gc-sections \
		-fstack-protector-strong -flto \
		-Wl,-z,now -Wl,--hash-style=sysv -Wl,--build-id=none; do
	AX_CHECK_COMPILE_FLAG([${flag}], [AX_APPEND_FLAG([${flag}])])
done

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