configure

#! /bin/sh
#
# Copyright (c) 2014, 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
# Copyright (c) 2017, 2018 Kristaps Dzonsons <kristaps@bsd.lv>
#
# 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.

OCONFIGURE_VERSION="0.1.7"

#
# This script outputs two files: config.h and Makefile.configure.
# It tries to read from configure.local, which contains predefined
# values we won't autoconfigure.
#
# If you want to use configure with your project, have your GNUmakefile
# or BSDmakefile---whichever---try to import/include Makefile.configure
# at the beginning of the file.
#
# Like so (note no quotes, no period, etc.):
#
#   include Makefile.configure
#
# If it exists, configure was run; otherwise, it wasn't.
#
# You'll probably want to change parts of this file.  I've noted the
# parts that you'll probably change in the section documentation.
#
# See https://github.com/kristapsdz/oconfigure for more.

set -e

#----------------------------------------------------------------------
# Prepare for running: move aside previous configure runs.
# Output file descriptor usage:
#  1 (stdout): config.h or Makefile.configure
#  2 (stderr): original stderr, usually to the console
#  3: config.log
# You DO NOT want to change this.
#----------------------------------------------------------------------

[ -w config.log ] && mv config.log config.log.old
[ -w config.h   ] && mv config.h config.h.old

exec 3> config.log
echo "config.log: writing..."

#----------------------------------------------------------------------
# Initialize all variables here such that nothing can leak in from the
# environment except for CC and CFLAGS, which we might have passed in.
#----------------------------------------------------------------------

CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | make -sf -`
CFLAGS=`printf "all:\\n\\t@echo \\\$(CFLAGS)\\n" | make -sf -`
CFLAGS="${CFLAGS} -g -W -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes"
CFLAGS="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
LDADD=
CPPFLAGS=
LDFLAGS=
DESTDIR=
PREFIX="/usr/local"
BINDIR=
SBINDIR=
INCLUDEDIR=
LIBDIR=
MANDIR=
SHAREDIR=
INSTALL="install"
INSTALL_PROGRAM=
INSTALL_LIB=
INSTALL_MAN=
INSTALL_DATA=

#----------------------------------------------------------------------
# Allow certain variables to be overriden on the command line.
#----------------------------------------------------------------------

for keyvals in "$@"
do
	key=`echo $keyvals | cut -s -d '=' -f 1`
	if [ -z "$key" ]
	then
		echo "$0: invalid key-value: $keyvals" 1>&2
		exit 1
	fi
	val=`echo $keyvals | cut -d '=' -f 2-`
	case "$key" in
	LDADD)
		LDADD="$val" ;;
	LDFLAGS)
		LDFLAGS="$val" ;;
	CPPFLAGS)
		CPPFLAGS="$val" ;;
	DESTDIR)
		DESTDIR="$val" ;;
	PREFIX)
		PREFIX="$val" ;;
	MANDIR)
		MANDIR="$val" ;;
	LIBDIR)
		LIBDIR="$val" ;;
	BINDIR)
		BINDIR="$val" ;;
	SHAREDIR)
		SHAREDIR="$val" ;;
	SBINDIR)
		SBINDIR="$val" ;;
	INCLUDEDIR)
		INCLUDEDIR="$val" ;;
	*)
		echo "$0: invalid key: $key" 1>&2
		exit 1
	esac
done


#----------------------------------------------------------------------
# These are the values that will be pushed into config.h after we test
# for whether they're supported or not.
# Each of these must have a runtest(), below.
# Please sort by alpha, for clarity.
# You WANT to change this.
#----------------------------------------------------------------------

HAVE_PLEDGE=
HAVE_STRTONUM=

#----------------------------------------------------------------------
# Allow configure.local to override all variables, default settings,
# command-line arguments, and tested features, above.
# You PROBABLY DO NOT want to change this.
#----------------------------------------------------------------------

if [ -r ./configure.local ]; then
	echo "configure.local: reading..." 1>&2
	echo "configure.local: reading..." 1>&3
	cat ./configure.local 1>&3
	. ./configure.local
else
	echo "configure.local: no (fully automatic configuration)" 1>&2
	echo "configure.local: no (fully automatic configuration)" 1>&3
fi

echo 1>&3

#----------------------------------------------------------------------
# Infrastructure for running tests.
# These consists of a series of functions that will attempt to run the
# given test file and record its exit into a HAVE_xxx variable.
# You DO NOT want to change this.
#----------------------------------------------------------------------

COMP="${CC} ${CFLAGS} ${CPPFLAGS} -Wno-unused -Werror"

# Check whether this HAVE_ setting is manually overridden.
# If yes, use the override, if no, do not decide anything yet.
# Arguments: lower-case test name, manual value

ismanual() {
	[ -z "${3}" ] && return 1
	echo "${1}: manual (HAVE_${2}=${3})" 1>&2
	echo "${1}: manual (HAVE_${2}=${3})" 1>&3
	echo 1>&3
	return 0
}

# Run a single autoconfiguration test.
# In case of success, enable the feature.
# In case of failure, do not decide anything yet.
# Arguments: lower-case test name, upper-case test name, additional
# CFLAGS, additional LIBS.

singletest() {
	extralib=""
	cat 1>&3 << __HEREDOC__
${1}: testing...
${COMP} -DTEST_${2} ${3} -o test-${1} tests.c ${4}
__HEREDOC__
	if ${COMP} -DTEST_${2} ${3} -o "test-${1}" tests.c ${4} 1>&3 2>&3; then
		echo "${1}: ${CC} succeeded" 1>&3
	else
		if [ -n "${5}" ] ; then
			echo "${1}: ${CC} failed with $? (retrying)" 1>&3
			cat 1>&3 << __HEREDOC__
${1}: testing...
${COMP} -DTEST_${2} ${3} -o test-${1} tests.c ${5}
__HEREDOC__
			if ${COMP} -DTEST_${2} ${3} -o "test-${1}" tests.c ${5} 1>&3 2>&3; then
				echo "${1}: ${CC} succeeded" 1>&3
				extralib="(with ${5})"
			else
				echo "${1}: ${CC} failed with $?" 1>&3
				echo 1>&3
				return 1
			fi
		else
			echo "${1}: ${CC} failed with $?" 1>&3
			echo 1>&3
			return 1
		fi
	fi

	echo "${1}: yes ${extralib}" 1>&2
	echo "${1}: yes ${extralib}" 1>&3
	echo 1>&3
	eval HAVE_${2}=1
	rm "test-${1}"
	return 0

	# Don't actually run the test: none of our tests check for
	# run-time behaviour.
	# if ./test-${1} 1>&3 2>&3; then
	# 	echo "${1}: yes" 1>&2
	# 	echo "${1}: yes" 1>&3
	# 	echo 1>&3
	# 	eval HAVE_${2}=1
	# 	rm "test-${1}"
	# 	return 0
	# else
	# 	echo "${1}: execution failed with $?" 1>&3
	# 	echo 1>&3
	# 	rm "test-${1}"
	# 	return 1
	# fi
}

# Run a complete autoconfiguration test, including the check for
# a manual override and disabling the feature on failure.
# Arguments: lower case name, upper case name, additional CFLAGS,
# additional LDADD, alternative LDADD.

runtest() {
	eval _manual=\${HAVE_${2}}
	ismanual "${1}" "${2}" "${_manual}" && return 0
	singletest "${1}" "${2}" "${3}" "${4}" "${5}" && return 0
	echo "${1}: no" 1>&2
	eval HAVE_${2}=0
	return 1
}

#----------------------------------------------------------------------
# Begin running the tests themselves.
# All of your tests must be defined here.
# Please sort as the HAVE_xxxx values were defined.
# You WANT to change this.
# It consists of the following columns:
#    runtest
#    (1) test file
#    (2) macro to set
#    (3) argument to cc *before* -o
#    (4) argument to cc *after*
#    (5) alternative argument to cc *after*
#----------------------------------------------------------------------

runtest pledge		PLEDGE				  || true
runtest strtonum	STRTONUM			  || true

#----------------------------------------------------------------------
# Output writing: generate the config.h file.
# This file contains all of the HAVE_xxxx variables necessary for
# compiling your source.
# You must include "config.h" BEFORE any other variables.
# You WANT to change this.
#----------------------------------------------------------------------

exec > config.h

# Start with prologue.

cat << __HEREDOC__
#ifdef __cplusplus
#error "Do not use C++: this is a C application."
#endif
#if !defined(__GNUC__) || (__GNUC__ < 4)
#define __attribute__(x)
#endif
#if defined(__linux__) || defined(__MINT__)
#define _GNU_SOURCE	/* See test-*.c what needs this. */
#endif
#if !defined(__BEGIN_DECLS)
# define __BEGIN_DECLS
#endif
#if !defined(__END_DECLS)
# define __END_DECLS
#endif
__HEREDOC__

# For the function declaration variables...

# Now we handle our HAVE_xxxx values.
# Most will just be defined as 0 or 1.

cat << __HEREDOC__
#define HAVE_PLEDGE ${HAVE_PLEDGE}
#define HAVE_STRTONUM ${HAVE_STRTONUM}
__HEREDOC__

# Now we do our function declarations for missing functions.

if [ ${HAVE_STRTONUM} -eq 0 ]; then
	echo "extern long long strtonum(const char *, long long, long long, const char **);"
fi

echo "config.h: written" 1>&2
echo "config.h: written" 1>&3

#----------------------------------------------------------------------
# Now we go to generate our Makefile.configure.
# This file is simply a bunch of Makefile variables.
# They'll work in both GNUmakefile and BSDmakefile.
# You MIGHT want to change this.
#----------------------------------------------------------------------

exec > Makefile.configure

[ -z "${BINDIR}"     ] && BINDIR="${PREFIX}/bin"
[ -z "${SBINDIR}"    ] && SBINDIR="${PREFIX}/sbin"
[ -z "${INCLUDEDIR}" ] && INCLUDEDIR="${PREFIX}/include"
[ -z "${LIBDIR}"     ] && LIBDIR="${PREFIX}/lib"
[ -z "${MANDIR}"     ] && MANDIR="${PREFIX}/man"
[ -z "${SHAREDIR}"   ] && SHAREDIR="${PREFIX}/share"

[ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
[ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
[ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
[ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"

cat << __HEREDOC__
CC		= ${CC}
CFLAGS		= ${CFLAGS}
CPPFLAGS	= ${CPPFLAGS}
LDADD		= ${LDADD}
LDFLAGS		= ${LDFLAGS}
STATIC		= ${STATIC}
PREFIX		= ${PREFIX}
BINDIR		= ${BINDIR}
SHAREDIR	= ${SHAREDIR}
SBINDIR		= ${SBINDIR}
INCLUDEDIR	= ${INCLUDEDIR}
LIBDIR		= ${LIBDIR}
MANDIR		= ${MANDIR}
INSTALL		= ${INSTALL}
INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
INSTALL_LIB	= ${INSTALL_LIB}
INSTALL_MAN	= ${INSTALL_MAN}
INSTALL_DATA	= ${INSTALL_DATA}
__HEREDOC__

echo "Makefile.configure: written" 1>&2
echo "Makefile.configure: written" 1>&3

exit 0