#!/bin/sh
###############################################################################
#
#  Copyright (C) 2003-2021  Anders Gavare.  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#
#  1. Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#  3. The name of the author may not be used to endorse or promote products
#     derived from this software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
#  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
#  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
#  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
#  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
#  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
#  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
#  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#  SUCH DAMAGE.
#
#
#  This is a minimal configure script, hardcoded for GXemul. This script
#  figures out which compiler flags will work, and creates Makefiles in
#  sub-directories. A config.h file is also created.
#
#
#  --->   FOR NORMAL USE, JUST RUN ./configure WITHOUT OPTIONS!
#
#
#  To compile the emulator with profiling (during development), use
#  CFLAGS="-pg", run the emulator, and then run 'gprof gxemul' and study
#  the results.
#
#  Or better, using callgrind/cachegrind/kcachegrind:
#  valgrind --tool=callgrind --dump-instr=yes ./gxemul -e testm88k test/FileLoader_A.OUT_M88K
#  or
#  valgrind --tool=cachegrind ./gxemul -e testm88k test/FileLoader_A.OUT_M88K
#  followed by
#  kcachegrind
#
#
#  The main things that are detected by this script:
#
#    o)  special hacks for some OSes
#    o)  which compiler to use  (overridden by setting CC)
#    o)  which compiler flags to use  (overridden by setting CFLAGS)
#    o)  X11 flags and libraries  (TODO: should be possible to override
#	 via command line options?)
#
#  The general philosophy regarding command line switches is that anything
#  which can be incorporated into the program as a runtime command line option
#  should be, instead of requiring a recompile.
#
###############################################################################

#
# Figure out the default prefix for "make install":
#
# If the PREFIX environment variable is set before running configure, it is
# used. The DEFAULTPREFIX calculated here is only used if PREFIX is undefined.
#
DEFAULTPREFIX=/usr/local

if [ z`uname` = zLinux ]; then
	# /usr is more common on Linux than /usr/local
	DEFAULTPREFIX=/usr
else
	TRY=/usr/local
	if [ -d $TRY/bin ]; then
		DEFAULTPREFIX=$TRY
	else
		TRY=/opt
		if [ -d $TRY ]; then
			DEFAULTPREFIX=$TRY
		else
			TRY=/usr
			if [ -d $TRY ]; then
				DEFAULTPREFIX=$TRY
			fi
		fi
	fi
fi

OTHERLIBS="$LDFLAGS"


if [ z"$*" != z ]; then
	#  Parse command line options:
	for a in $*; do
		if [ z$a = z--disable-x ]; then
			NOX11=YES
		else if [ z$a = z--debug ]; then
			DEBUG=YES
		else if [ z$a = z--help ]; then
			printf "usage: $0 [options]\n\n"
			echo "  --disable-x           don't include X11 support,"\
			    "even if the host supports it"
			echo "  --debug               configure for a" \
				"debug build (turn off optimizations,"
			echo "                        try enabling -Werror etc.)"
			echo
			echo "If the PREFIX environment variable is set," \
			    "it will override the default"
			echo "value, which on this platform is: $DEFAULTPREFIX"
			echo
			exit
		else
			echo "Invalid option: $a"
			echo "Run  $0 --help  to get a list of" \
			    "available options."
			exit
		fi; fi; fi
	done
fi


###############################################################################
#
#  Configure options:
#
#  This creates a config.h file, which is then included from include/misc.h.
#
###############################################################################

#  Head of config.h:
printf "/*
 *  THIS FILE IS AUTOMATICALLY CREATED BY configure!
 *  DON'T EDIT THIS FILE MANUALLY, IT WILL BE OVERWRITTEN.
 */
\n#ifndef CONFIG_H\n#define CONFIG_H\n\n" > config.h


#  Figure out if VERSION should be defined.
X=`basename \`pwd\`|cut -d \- -f 2-`
if [ z"$X" = zgxemul ]; then
	printf "#define VERSION \"(unknown version)\"\n" >> config.h
else
	printf "#define VERSION \"$X\"\n" >> config.h
fi


if [ z"$DEBUG" = zYES ]; then
	echo "Building a DEBUG version!"
fi


ZZ=`echo compiled on \`uname\`/\`uname -m\`, \`date\``
printf "#define COMPILE_DATE \"$ZZ\"\n" >> config.h


#  Include support for all CPU types:
printf "#define ADD_ALL_CPU_FAMILIES    " >> config.h

#  Alpha
printf " add_cpu_family(alpha_cpu_family_init, ARCH_ALPHA);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_alpha.o cpu_alpha_palcode.o memory_alpha.o"
CPU_TOOLS="$CPU_TOOLS generate_alpha_misc"

#  ARM
printf " add_cpu_family(arm_cpu_family_init, ARCH_ARM);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_arm.o cpu_arm_coproc.o memory_arm.o "
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p0_u0_w0.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p0_u0_w1.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p0_u1_w0.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p0_u1_w1.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p1_u0_w0.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p1_u0_w1.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p1_u1_w0.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_loadstore_p1_u1_w1.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_dpi.o tmp_arm_r.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_r0.o tmp_arm_r1.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_r2.o tmp_arm_r3.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_r4.o tmp_arm_r5.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_r6.o tmp_arm_r7.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_r8.o tmp_arm_r9.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_ra.o tmp_arm_rb.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_rc.o tmp_arm_rd.o"
CPU_ARCHS="$CPU_ARCHS tmp_arm_re.o tmp_arm_rf.o tmp_arm_multi.o"
CPU_TOOLS="$CPU_TOOLS generate_arm_dpi generate_arm_r"
CPU_TOOLS="$CPU_TOOLS generate_arm_loadstore generate_arm_multi"

#  i960
printf " add_cpu_family(i960_cpu_family_init, ARCH_I960);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_i960.o memory_i960.o"

#  M88K
printf " add_cpu_family(m88k_cpu_family_init, ARCH_M88K);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_m88k.o memory_m88k.o"
CPU_TOOLS="$CPU_TOOLS generate_m88k_bcnd"
CPU_TOOLS="$CPU_TOOLS generate_m88k_loadstore"

#  MIPS
printf " add_cpu_family(mips_cpu_family_init, ARCH_MIPS);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_mips.o cpu_mips_coproc.o "
CPU_ARCHS="$CPU_ARCHS cpu_mips_instr_unaligned.o"
CPU_TOOLS="$CPU_TOOLS generate_mips_loadstore"
CPU_TOOLS="$CPU_TOOLS generate_mips_loadstore_multi"

#  POWER/PowerPC
printf " add_cpu_family(ppc_cpu_family_init, ARCH_PPC);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_ppc.o"
CPU_TOOLS="$CPU_TOOLS generate_ppc_loadstore"

#  RISC-V
printf " add_cpu_family(riscv_cpu_family_init, ARCH_RISCV);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_riscv.o memory_riscv.o"

#  SuperH
printf " add_cpu_family(sh_cpu_family_init, ARCH_SH);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_sh.o memory_sh.o"

printf "\n" >> config.h


###############################################################################
#
#  Create the Makefile header:
#
###############################################################################

rm -f _Makefile.header

printf "#
#  DO NOT EDIT THIS FILE! It is automagically created by
#  the configure script, based on Makefile.skel.
#\n\n" >> _Makefile.header


#  Try with the simplest possible test program. Actually, test static variables
#  as well, because GXemul uses things like NULL-initialized global pointers,
#  and it is important that they work. (Some versions of GCC on Solaris are
#  known to be completely broken, for instance.)

echo '#include <stdio.h>
#include <stdbool.h>

int main(int argc, char* argv[])
{
	static int s = 0;
	int x = 2;	// make sure that BCPL style comments work,
	x ++;		// that code and variable declarations can be
	int y = -2;	// mixed, and that the bool type behaves
	bool a = x;	// reasonably.
	bool b = y;
	bool c = a + b;
	int d = a + b;
	printf("%i,%i,%i,%i,%i", s, a, b, c, d);
	for (int i = 0; i < 10; ++i) ;
	return 0;
}
' > _testprog.c


#  Try to detect which C compiler to use, if CC is not set:
printf "checking which C compiler to use... "
rm -f _testprog
if [ z"$CC" = z ]; then
	CC=cc
fi

printf "#!/bin/sh\n$CC $CFLAGS _testprog.c -o _testprog >" > _test.sh
printf " /dev/null 2> /dev/null\n" >> _test.sh
chmod 755 _test.sh
./_test.sh > /dev/null 2> /dev/null
OK=0
if [ -x _testprog ]; then
	OK=1
	if [ z`./_testprog` = z0,1,1,1,2 ]; then
		OK=2
	fi
fi

if [ z$OK = z0 ]; then
	printf "broken cc detected: $CC $CFLAGS\n"
	printf "The test program:\n\n"
	cat _testprog.c
	printf "could not be compiled at all.\n"
fi

if [ z$OK = z1 ]; then
	printf "broken cc detected: $CC $CFLAGS\n"
	printf "The test program:\n\n"
	cat _testprog.c
	printf "should have resulted in  0,1,1,1,2  but the result was: "
	./_testprog
fi

if [ z$OK != z2 ]; then
	printf "\nPlease set the CC environment variable to a working C "
	printf "compiler before running\nthe configure script, and make"
	printf " sure that the CFLAGS environment variable is\nalso valid"
	printf " for that compiler (e.g. -std=c99 if needed).\n"
	exit
fi

rm -f _testprog
rm -f _test.sh


echo "$CC $CFLAGS"


if [ z"$DEBUG" != zYES ]; then
	CFLAGS="-DNDEBUG $CFLAGS"
fi


if [ z$NOX11 = z ]; then
	printf "checking for X11 headers and libs\n"

	#  Try to compile a small X11 test program:
	printf "#include <X11/Xlib.h>
	#include <stdio.h>
	Display *dis;
	void f(void) {
		dis = XOpenDisplay(NULL);
	}
	int main(int argc, char *argv[])
	{ printf(\"1\"); return 0; }
	" > _test_x11.c

	XOK=0

	XINCLUDE=-I/usr/X11R6/include
	$CC $CFLAGS _test_x11.c -c -o _test_x11.o $XINCLUDE 2> /dev/null

	XLIB="-L/usr/X11R6/lib -lX11 -Wl,-rpath,/usr/X11R6/lib"
	$CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

	if [ -x _test_x11 ]; then
		if [ 1 = `./_test_x11` ]; then
			XOK=1
		fi
	fi

	rm -f _test_x11 _test_x11.o

	if [ z$XOK = z0 ]; then
		XINCLUDE=-I/usr/X11R7/include
		$CC $CFLAGS _test_x11.c -c -o _test_x11.o $XINCLUDE 2> /dev/null

		XLIB="-L/usr/X11R7/lib -lX11 -Wl,-rpath,/usr/X11R7/lib"
		$CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

		if [ -x _test_x11 ]; then
			if [ 1 = `./_test_x11` ]; then
				XOK=1
			fi
		fi
	fi
	rm -f _test_x11 _test_x11.o

	if [ z$XOK = z0 ]; then
		XINCLUDE=-I/usr/local/include
		$CC $CFLAGS _test_x11.c -c -o _test_x11.o $XINCLUDE 2> /dev/null

		XLIB="-L/usr/local/lib -lX11 -Wl,-rpath,/usr/local/lib"
		$CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

		if [ -x _test_x11 ]; then
			if [ 1 = `./_test_x11` ]; then
				XOK=1
			fi
		fi
	fi
	rm -f _test_x11 _test_x11.o

	# MacOS:
	if [ z$XOK = z0 ]; then
		XINCLUDE=-I/opt/X11/include
		$CC $CFLAGS _test_x11.c -c -o _test_x11.o $XINCLUDE 2> /dev/null

		XLIB="-L/opt/X11/lib -lX11"
		$CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

		if [ -x _test_x11 ]; then
			XOK=1
		fi
	fi
	rm -f _test_x11 _test_x11.o

	#  Special case for some 64-bit Linux/x86_64 systems:
	if [ z$XOK = z0 ]; then
		$CC $CFLAGS _test_x11.c -c -o _test_x11.o $XINCLUDE 2> /dev/null

		XLIB="-L/usr/X11R6/lib64 -lX11"
		$CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

		if [ -x _test_x11 ]; then
			if [ 1 = `./_test_x11` ]; then
				XOK=1
			fi
		fi
	fi
	rm -f _test_x11 _test_x11.o

	if [ z$XOK = z0 ]; then
		XINCLUDE=""
		$CC $CFLAGS _test_x11.c -c -o _test_x11.o $XINCLUDE 2> /dev/null

		#  -lsocket for Solaris
		XLIB="-lX11 -lsocket"
		$CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

		if [ -x _test_x11 ]; then
			if [ 1 = `./_test_x11` ]; then
				XOK=1
			fi
		fi
		rm -f _test_x11 _test_x11.o
	fi

	if [ z$XOK = z0 ]; then
		echo "Failed to compile X11 test program." \
		    "Configuring without X11."
	else
		printf "   headers:   $XINCLUDE\n"
		printf "   libraries: $XLIB\n"
		echo "XINCLUDE=$XINCLUDE" >> _Makefile.header
		echo "XLIB=$XLIB" >> _Makefile.header
		printf "#define WITH_X11\n" >> config.h
	fi

	rm -f _test_x11.c
fi


if [ z$HPUX = zYES ]; then
	CFLAGS="-D_XOPEN_SOURCE_EXTENDED $CFLAGS"
	printf "#define HPUX\n" >> config.h
fi


if [ z$OSF1 = zYES ]; then
	CFLAGS="-D_XOPEN_SOURCE=500 -D_OSF_SOURCE -D_POSIX_PII_SOCKET $CFLAGS"
fi


#  CWARNINGS:
printf "checking whether -Wall can be used... "
$CC $CFLAGS _testprog.c -o _testprog -Wall 2> /dev/null
if [ -x _testprog ]; then
	printf "yes\n"
	CWARNINGS="-Wall $CWARNINGS"

	if [ z"$DEBUG" = zYES ]; then
		printf "checking whether -Werror can be used... "
		rm -f _testprog
		$CC $CWARNINGS $CFLAGS _testprog.c -o _testprog -Werror 2> _testprog.err
		if [ -x _testprog ]; then
			printf "yes\n"
			CWARNINGS="$CWARNINGS -Werror"
		else
			printf "no\n"
			
			#printf "CFLAGS = $CFLAGS\n"
			#cat _testprog.err
			#printf "\n"
		fi
	fi
else
	printf "no\n"
fi
rm -f _testprog _testprog.err


#  -Wstrict-aliasing
printf "checking whether -Wstrict-aliasing can be used... "
$CC $CFLAGS -Wstrict-aliasing _testprog.c -o _testprog 1> _testprog.stdout 2>&1
cat _testprog.stdout >> _testprog.error
if grep strict _testprog.error > /dev/null 2>&1; then
	printf "no\n"
else
	if [ -x _testprog ]; then
		CWARNINGS="-Wstrict-aliasing $CWARNINGS"
		printf "yes\n"
	else
		printf "no\n"
	fi
fi
rm -f _testprog _testprog.error _testprog.stdout


#  -Wextra -Wno-unused-parameter -Wno-cast-align
printf "checking whether -Wextra -Wno-unused-parameter -Wno-cast-align can be used... "
$CC $CFLAGS -Wextra -Wno-unused-parameter -Wno-cast-align _testprog.c -o _testprog 1> _testprog.stdout 2>&1
cat _testprog.stdout >> _testprog.error
if grep strict _testprog.error > /dev/null 2>&1; then
	printf "no\n"
else
	if [ -x _testprog ]; then
		CWARNINGS="$CWARNINGS -Wextra -Wno-unused-parameter -Wno-cast-align"
		printf "yes\n"
	else
		printf "no\n"
	fi
fi
rm -f _testprog _testprog.error _testprog.stdout


#  -Wcast-align
printf "checking whether -Wcast-align can be used... "
$CC $CFLAGS -Wcast-align _testprog.c -o _testprog 1> _testprog.stdout 2>&1
cat _testprog.stdout >> _testprog.error
if grep strict _testprog.error > /dev/null 2>&1; then
	printf "no\n"
else
	if [ -x _testprog ]; then
		CWARNINGS="-Wcast-align $CWARNINGS"
		printf "yes\n"
	else
		printf "no\n"
	fi
fi
rm -f _testprog _testprog.error _testprog.stdout


#  -Wshadow
printf "checking whether -Wshadow can be used... "
$CC $CFLAGS -Wshadow _testprog.c -o _testprog 1> _testprog.stdout 2>&1
cat _testprog.stdout >> _testprog.error
if grep strict _testprog.error > /dev/null 2>&1; then
	printf "no\n"
else
	if [ -x _testprog ]; then
		CWARNINGS="-Wshadow $CWARNINGS"
		printf "yes\n"
	else
		printf "no\n"
	fi
fi
rm -f _testprog _testprog.error _testprog.stdout


#  -O optimization for non-debug builds. Try -O and -O3.
if [ ! z"$DEBUG" = zYES ]; then
	printf "checking whether -O3 or -O can be used (non-DEBUG build)... "
	$CC $CFLAGS -O _testprog.c -o _testprog 2> /dev/null
	if [ -x _testprog ]; then
		rm -f _testprog
		$CC $CFLAGS -O3 _testprog.c -o _testprog 2> /dev/null
		if [ -x _testprog ]; then
			CFLAGS="-O3 $CFLAGS"
			printf "yes, -O3\n"
		else
			CFLAGS="-O $CFLAGS"
			printf "yes, -O\n"
		fi
	else
		printf "no\n"
	fi
fi
rm -f _testprog


#  -fpeephole
if [ ! z"$DEBUG" = zYES ]; then
	printf "checking whether -fpeephole can be used... "
	$CC $CFLAGS -fpeephole _testprog.c -o _testprog > _testprog.stdout 2>&1
	cat _testprog.stdout >> _testprog.error
	if grep peephole _testprog.error > /dev/null 2>&1; then
		printf "no\n"
	else
		if [ -x _testprog ]; then
			CFLAGS="-fpeephole $CFLAGS"
			printf "yes\n"
		else
			printf "no\n"
		fi
	fi
	rm -f _testprog _testprog.error _testprog.stdout
fi


#  -fomit-frame-pointer
if [ ! z"$DEBUG" = zYES ]; then
	printf "checking whether -fomit-frame-pointer can be used... "
	$CC $CFLAGS -fomit-frame-pointer _testprog.c -o \
	    _testprog 1> _testprog.stdout 2>&1
	cat _testprog.stdout >> _testprog.error
	if grep frame _testprog.error > /dev/null 2>&1; then
		printf "no\n"
	else
		if [ -x _testprog ]; then
			CFLAGS="-fomit-frame-pointer $CFLAGS"
			printf "yes\n"
		else
			printf "no\n"
		fi
	fi
	rm -f _testprog _testprog.error _testprog.stdout
fi


#  -fstrict-aliasing
if [ ! z"$DEBUG" = zYES ]; then
	printf "checking whether -fstrict-aliasing can be used... "
	$CC $CFLAGS -fstrict-aliasing _testprog.c -o \
	    _testprog 1> _testprog.stdout 2>&1
	cat _testprog.stdout >> _testprog.error
	if grep strict _testprog.error > /dev/null 2>&1; then
		printf "no\n"
	else
		if [ -x _testprog ]; then
			CFLAGS="-fstrict-aliasing $CFLAGS"
			printf "yes\n"
		else
			printf "no\n"
		fi
	fi
	rm -f _testprog _testprog.error _testprog.stdout
fi


#  -g, for debug builds
if [ z"$DEBUG" = zYES ]; then
	printf "checking whether -g can be used... "
	$CC $CFLAGS -g _testprog.c -o _testprog > _testprog.stdout 2>&1
	cat _testprog.stdout >> _testprog.error
	if [ -x _testprog ]; then
		CFLAGS="-g $CFLAGS"
		printf "yes\n"
	else
		printf "no\n"
	fi
	rm -f _testprog _testprog.error _testprog.stdout
fi


#  -lrt for nanosleep?
printf "checking whether -lrt is required for nanosleep... "
printf "#include <time.h>\n#include <stdio.h>
int main(int argc, char *argv[]){nanosleep(NULL,NULL);return 0;}\n" > _testns.c
$CC $CFLAGS _testns.c -o _testns 2> /dev/null
if [ ! -x _testns ]; then
	$CC $CFLAGS -lrt _testns.c -o _testns 2> /dev/null
	if [ ! -x _testns ]; then
		printf "WARNING! COULD NOT COMPILE WITH nanosleep AT ALL!\n"
	else
		#  -lrt for nanosleep
		OTHERLIBS="-lrt $OTHERLIBS"
		printf "yes\n"
	fi
else
	printf "no\n"
fi
rm -f _testns.c _testns


#  -lresolv for inet_pton?
printf "checking whether -lresolv is required for inet_pton... "
printf "int inet_pton(void); int main(int argc, " > _testr.c
printf "char *argv[]) { return inet_pton(); }\n" >> _testr.c
$CC $CFLAGS _testr.c -o _testr 2> /dev/null
if [ ! -x _testr ]; then
	$CC $CFLAGS _testr.c -lresolv -o _testr 2> /dev/null
	if [ ! -x _testr ]; then
		$CC $CFLAGS _testr.c -lresolv -lnsl -o _testr 2> /dev/null
		if [ ! -x _testr ]; then
			printf "no, using inet_aton\n"
		else
			#  -lresolv -lnsl for inet_pton
			OTHERLIBS="-lresolv -lnsl $OTHERLIBS"
			printf "yes (and -lnsl)\n"
			printf "#define HAVE_INET_PTON\n" >> config.h
		fi
	else
		#  -lresolv for inet_pton
		OTHERLIBS="-lresolv $OTHERLIBS"
		printf "yes\n"
		printf "#define HAVE_INET_PTON\n" >> config.h
	fi
else
	printf "no\n"
	printf "#define HAVE_INET_PTON\n" >> config.h
fi
rm -f _testr.c _testr.o _testr


#  -lm?
printf "checking for math libs..."
printf "#include <math.h>\nint main(int argc, char *argv[]) { " > _testr.c
printf "double x = sqrt(sin((double)argc)); return (int)x; }\n" >> _testr.c
$CC $CFLAGS _testr.c -o _testr 2> /dev/null
if [ ! -x _testr ]; then
	$CC $CFLAGS _testr.c -lm -o _testr 2> /dev/null
	if [ ! -x _testr ]; then
		$CC $CFLAGS _testr.c -lm -lcpml -o _testr 2> /dev/null
		if [ ! -x _testr ]; then
			printf "\nWARNING! Could not compile math test "
			printf "at all!\nContinuing anyway.\n\n"
		else
			#  -lm AND -lcpml
			OTHERLIBS="-lm -lcpml $OTHERLIBS"
			printf " -lm -lcpml\n"
		fi
	else
		#  Normal -lm
		OTHERLIBS="-lm $OTHERLIBS"
		printf " -lm\n"
	fi
else
	printf " none needed\n"
fi
rm -f _testr.c _testr.o _testr


#  strlcpy missing?
printf "checking for strlcpy... "
printf "#include <string.h>
int main(int argc, char *argv[]) { char *p; char *q; size_t x;
  x = strlcpy(p, q, 50); return 0;}\n" > _tests.c
$CC $CFLAGS _tests.c -o _tests 2> /dev/null
if [ ! -x _tests ]; then
	printf "missing, using mystrlcpy\n"
	printf "#define strlcpy mystrlcpy\n" >> config.h
	printf "#define strlcat mystrlcat\n" >> config.h
	printf "#define USE_STRLCPY_REPLACEMENTS\n" >> config.h
else
	printf "found\n"
fi
rm -f _tests.c _tests.o _tests


#  strtoull missing?
printf "checking for strtoull... "
printf "#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
  long long x = strtoull(argv[1], NULL, 0); return 0;}\n" > _tests.c
$CC $CFLAGS _tests.c -o _tests 2> /dev/null
if [ ! -x _tests ]; then
	printf "missing, using mystrtoull\n"
	printf "#define strtoull mystrtoull\n" >> config.h
else
	printf "found\n"
fi
rm -f _tests.c _tests.o _tests


#  mkstemp missing?
printf "checking for mkstemp... "
printf "#include <unistd.h>
#include <stdlib.h>
int main(int argc, char *argv[]) { int x; char y[4] = \"abc\";
x = mkstemp(y); return 0;}\n" > _tests.c
$CC $CFLAGS _tests.c -o _tests 2> /dev/null
if [ ! -x _tests ]; then
	printf "missing, using workaround (perhaps not working properly)\n"
	printf "#define mkstemp mymkstemp\n" >> config.h
else
	printf "found\n"
fi
rm -f _tests.c _tests.o _tests


#  fseeko missing?
printf "checking for fseeko... "
printf "#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <sys/types.h>
int main(int argc, char *argv[]) { fseeko(NULL, 0, 0); return 0;}\n" > _tests.c
$CC $CFLAGS $CWARNINGS _tests.c -o _tests 2> /dev/null
if [ ! -x _tests ]; then
	# Try with _LARGEFILE_SOURCE (hack to make fseeko
	# work on 64-bit Linux):
	$CC $CFLAGS -D_LARGEFILE_SOURCE $CWARNINGS _tests.c -o _tests 2> /dev/null
	if [ ! -x _tests ]; then
		printf "missing\n"
		printf "WARNING! fseeko missing from libc. Using a hack, "
		printf "which probably doesn't work.\n"
		printf "#define HACK_FSEEKO\n" >> config.h
	else
		printf "using -D_LARGEFILE_SOURCE hack\n"
		CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE"
	fi
else
	printf "found\n"
fi
rm -f _tests.c _tests.o _tests


#  socklen_t missing?
#  (for example really old OpenBSD/arc 2.3, inside the emulator)
printf "checking for socklen_t... "
printf "#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
int main(int argc, char *argv[]) { socklen_t x; return 0;}\n" > _tests.c
$CC $CFLAGS _tests.c -o _tests 2> /dev/null
if [ ! -x _tests ]; then
	printf "no, using int\n"
	CFLAGS="$CFLAGS -Dsocklen_t=int"
else
	printf "socklen_t\n"
fi
rm -f _tests.c _tests.o _tests


#  MAP_ANON missing? (On some HP-UX systems? Use MAP_ANONYMOUS instead.)
printf "checking for MAP_ANON... "
rm -f _tests
printf "#include <stdio.h>
#include <sys/types.h>
#include <sys/mman.h>
int main(int argc, char *argv[]) { int x = MAP_ANON; return 0;}\n" > _tests.c
$CC $CFLAGS _tests.c -o _tests 2> /dev/null
if [ ! -x _tests ]; then
	printf "#include <stdio.h>
#include <sys/types.h>
#include <sys/mman.h>
int main(int argc, char *argv[])
{ int x = MAP_ANONYMOUS; return 0;}\n" > _tests.c
	$CC $CFLAGS _tests.c -o _tests 2> /dev/null
	if [ ! -x _tests ]; then
		printf "no\n\n"
		printf "WARNING! Neither MAP_ANON nor MAP_ANONYMOUS work on "
		printf "this system.\nPlease try to compile anyway, and report"
		printf " to me whether it builds/runs or not.\n\n"
		printf "#define MAP_ANON 0\n" >> config.h
		printf "#define NO_MAP_ANON\n" >> config.h
	else
		printf "using MAP_ANONYMOUS\n"
		printf "#define MAP_ANON MAP_ANONYMOUS\n" >> config.h
	fi
else
	printf "yes\n"
fi
rm -f _tests.c _tests.o _tests


#  Check for PRIx64 in inttypes.h:
printf "checking for PRIx64 in inttypes.h... "
printf "#include <inttypes.h>\nint main(int argc, char *argv[])\n
{\n#ifdef PRIx64\nreturn 0;\n#else\nreturn 1;\n#endif\n}\n" > _testpri.c
$CC $CFLAGS _testpri.c -o _testpri 2> /dev/null
if [ ! -x _testpri ]; then
	printf "\nERROR! COULD NOT COMPILE PRIx64 TEST PROGRAM AT ALL!\n"
	exit
else
	if ./_testpri; then
		printf "yes\n"
	else
		$CC $CFLAGS -D__STDC_FORMAT_MACROS _testpri.c -o _testpri 2> /dev/null
		if [ -x _testpri ]; then
			printf "using __STDC_FORMAT_MACROS\n"
			CFLAGS="$CFLAGS -D__STDC_FORMAT_MACROS"
		else
			printf "no, using an ugly hack instead, "
			printf "#define NO_C99_PRINTF_DEFINES\n" >> config.h

			# Try llx first:
			printf "#include <stdio.h>\n#include <inttypes.h>\nint main(int argc, char *argv[]){
			    printf(\"%%llx\\\n\", (int64_t)128);return 0;}\n" > _testpri.c
			rm -f _testpri
			$CC $CFLAGS $CWARNINGS _testpri.c -o _testpri 2> /dev/null
			if [ z`./_testpri` = z80 ]; then
				printf "PRIx64=llx\n"
				printf "#define NO_C99_64BIT_LONGLONG\n" >> config.h
			else
				# Try lx too:
				printf "#include <stdio.h>\n#include <inttypes.h>\nint main(int argc, char *argv[]){
				    printf(\"%%lx\\\n\", (int64_t)128);return 0;}\n" > _testpri.c
				rm -f _testpri
				$CC $CFLAGS $CWARNINGS _testpri.c -o _testpri 2> _testpri.result
				if [ z`./_testpri` = z80 ]; then
					printf "PRIx64=lx\n"
				else
					printf "\nFailed, neither lx nor llx worked!\n"
					exit
				fi
			fi
		fi
	fi
fi
rm -f _testpri.c _testpri _testpri.result


#  Check for 64-bit off_t:
printf "checking for 64-bit off_t... "
printf "#include <stdio.h>\n#include <inttypes.h>\n#include <sys/types.h>\n
int main(int argc, char *argv[]){printf(\"%%i\\\n\",
 (int)sizeof(off_t));return 0;}\n" > _testoff.c
$CC $CFLAGS _testoff.c -o _testoff 2> /dev/null
if [ ! -x _testoff ]; then
	printf "\nWARNING! COULD NOT COMPILE off_t TEST PROGRAM AT ALL!\n"
else
	if [ z`./_testoff` = z8 ]; then
		printf "yes\n"
	else
		$CC $CFLAGS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
		    _testoff.c -o _testoff 2> /dev/null
		if [ ! -x _testoff ]; then
			printf "\nWARNING! COULD NOT COMPILE off_t TEST "
			printf "PROGRAM!\n"
		else
			if [ z`./_testoff` = z8 ]; then
				CFLAGS="-D_FILE_OFFSET_BITS=64 $CFLAGS"
				CFLAGS="-D_LARGEFILE_SOURCE $CFLAGS"
				printf "using -D_FILE_OFFSET_BITS=64"
				printf " -D_LARGEFILE_SOURCE\n"
			else
				printf "NO\n"
				printf "Warning! No 64-bit off_t. Continuing "
				printf "anyway.\n"
			fi
		fi
	fi
fi
rm -f _testoff.c _testoff


#  Check for u_int8_t etc:
#  These are needed because some header files in src/include/ use u_int*
#  instead of uint*, and I don't have time to rewrite them all.
printf "checking for u_int8_t... "
printf "#include <stdio.h>\n#include <inttypes.h>\n#include <sys/types.h>\n
int main(int argc, char *argv[]){printf(\"%%i\\\n\",
 (int)sizeof(u_int8_t));return 0;}\n" > _testuint.c
$CC $CFLAGS _testuint.c -o _testuint 2> /dev/null
if [ ! -x _testuint ]; then
	rm -f _testuint*
	printf "#include <stdio.h>\n#include <inttypes.h>
	\n#include <sys/types.h>\nint main(int argc, char *argv[])
	{printf(\"%%i\\\n\", (int)sizeof(uint8_t));return 0;}\n" > _testuint.c
	$CC $CFLAGS _testuint.c -o _testuint 2> /dev/null
	if [ ! -x _testuint ]; then
		printf "no\n\nERROR: No u_int8_t or uint8_t. Aborting\n"
		#  TODO: Automagically detect using various combinations
		#  of char, int, short, long etc.
		exit
	fi

	printf "typedef uint8_t u_int8_t;\n" >> config.h
	printf "typedef uint16_t u_int16_t;\n" >> config.h
	printf "typedef uint32_t u_int32_t;\n" >> config.h
	printf "uint8_t\n"
else
	printf "yes\n"
fi
rm -f _testuint.c _testuint

printf "checking for u_int64_t... "
printf "#include <stdio.h>\n#include <inttypes.h>\n#include <sys/types.h>\n
int main(int argc, char *argv[]){printf(\"%%i\\\n\",
 (int)sizeof(u_int64_t));return 0;}\n" > _testuint.c
$CC $CFLAGS _testuint.c -o _testuint 2> /dev/null
if [ ! -x _testuint ]; then
	rm -f _testuint*
	printf "#include <stdio.h>\n#include <inttypes.h>
	\n#include <sys/types.h>\nint main(int argc, char *argv[])
	{printf(\"%%i\\\n\", (int)sizeof(uint64_t));return 0;}\n" > _testuint.c
	$CC $CFLAGS _testuint.c -o _testuint 2> /dev/null
	if [ ! -x _testuint ]; then
		printf "no\n\nERROR: No u_int64_t or uint64_t. Aborting\n"
		#  TODO: Automagically detect using various combinations
		#  of char, int, short, long etc.
		exit
	fi

	printf "typedef uint64_t u_int64_t;\n" >> config.h
	printf "uint64_t\n"
else
	printf "yes\n"
fi
rm -f _testuint*

printf "checking for __builtin_expect... "
printf "#include <stdio.h>\n\nint main(int argc, char *argv[]) {
  if (__builtin_expect(!!(2), 1)) return 0;\n  return 1;\n}\n" > _testexpect.c
$CC $CFLAGS _testexpect.c -o _testexpect 2> /dev/null
if [ ! -x _testexpect ]; then
	printf "no\n"
	printf "#define likely(x) (x)\n" >> config.h
	printf "#define unlikely(x) (x)\n" >> config.h
else
	printf "yes\n"
	printf "#define likely(x) __builtin_expect(!!(x), 1)\n" >> config.h
	printf "#define unlikely(x) __builtin_expect(!!(x), 0)\n" >> config.h
fi
rm -f _testexpect*


###############################################################################

#  Host byte order?
printf "checking host endianness... "
rm -f _test_end*
printf '#include <stdio.h>
int main(int argc, char *argv[])
{  int x = 1; void *xp = (void *)&x; char *p = (char *)xp;
if (*p) printf("little\\\n"); else printf("big\\\n"); }
' > _test_end.c
$CC $CFLAGS _test_end.c -o _test_end 2> /dev/null
X=`./_test_end`
echo $X
if [ z$X = zlittle ]; then
	printf "#define HOST_LITTLE_ENDIAN\n" >> config.h
else
	if [ z$X = zbig ]; then
		printf "#define HOST_BIG_ENDIAN\n" >> config.h
	else
		echo "Error! Could not determine host's endianness."
		exit
	fi
fi
rm -f _test_end*


###############################################################################

if [ "z$PREFIX" = z ]; then
	PREFIX="$DEFAULTPREFIX"
fi
echo "checking for 'make install' prefix: $PREFIX"


###############################################################################

if [ z"$MANDIR" = z ]; then
	# Guess either $PREFIX/share/man or $PREFIX/man, depending on existing
	# directories. Fallback is $PREFIX/man.
	TRY=$PREFIX/share/man
	if [ -d "$TRY" ]; then
		MANDIR="$TRY"
	else
		MANDIR="$PREFIX"/man
	fi
fi
echo "checking for 'make install' man dir: $MANDIR"


###############################################################################

INCLUDE=-Iinclude/
DINCLUDE=-I../include/
INCLUDE2=-I../../include/

rm -f _testprog.c*

echo C compiler flags: $CFLAGS $CWARNINGS
echo Linker flags: $OTHERLIBS
if [ z"$DESTDIR" != z ]; then
	echo "Destination dir: $DESTDIR"
fi
echo "CWARNINGS=$CWARNINGS" >> _Makefile.header
echo "COPTIM=$CFLAGS" >> _Makefile.header
echo "INCLUDE=$INCLUDE" >> _Makefile.header
echo "DINCLUDE=$DINCLUDE" >> _Makefile.header
echo "INCLUDE2=$INCLUDE2" >> _Makefile.header
echo "CC=$CC" >> _Makefile.header
echo "OTHERLIBS=$OTHERLIBS" >> _Makefile.header
echo "CPU_ARCHS=$CPU_ARCHS" >> _Makefile.header
echo "CPU_TOOLS=$CPU_TOOLS" >> _Makefile.header
echo "PREFIX=$PREFIX" >> _Makefile.header
echo "MANDIR=$MANDIR" >> _Makefile.header
echo "DESTDIR=$DESTDIR" >> _Makefile.header
echo "" >> _Makefile.header

#  Create the Makefiles:
D=". src src/console src/cpus src/debugger src/devices src/core"
D="$D src/devices/fonts src/disk src/file src/include src/machines"
D="$D src/net src/promemul src/symbol"
echo "creating Makefiles..."
for a in $D; do
	touch $a/Makefile
	cat _Makefile.header > $a/Makefile
	cat $a/Makefile.skel >> $a/Makefile
done

#  Undefine 'mips', to enable build on OpenBSD's MIPS platforms:
printf "\n#undef mips\n" >> config.h

#  Tail of config.h:
printf "\n#endif  /*  CONFIG_H  */\n" >> config.h

#  Remove temporary Makefile header, etc.:
rm -f _Makefile.header _test*

echo Configured. You may now run ' make ' to build gxemul.