Annotation of /upstream/20070918/configure

#!/bin/sh
###############################################################################
#
#  Copyright (C) 2003-2007  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.
#
#
#  $Id: configure,v 1.277 2007/08/29 20:36:05 debug Exp $
#
#  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.
#
#
#  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 if this is a stable version (0.x.x).
X=`basename \`pwd\`|cut -d \- -f 2-|cut -c1-2`
if [ z"$X" = z0. ]; then
        #  Stable.
        :
else
        #  Development.
        UNSTABLE=YES
fi

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: $0 [options]\n\n"
                        echo "  --disable-x         don't include X11 support,"\
                            "even if the host supports it"
                        if [ z"$UNSTABLE" = zYES ]; then
                                echo "  --debug             configure" \
                                        "for a debug build"
                        fi
                        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"$UNSTABLE" = zYES ]; then
        printf "#define UNSTABLE_DEVEL\n" >> config.h
else
        CFLAGS="-DNDEBUG $CFLAGS"
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"

#  M32R
printf " add_cpu_family(m32r_cpu_family_init, ARCH_M32R);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_m32r.o memory_m32r.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"

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

#  SPARC
printf " add_cpu_family(sparc_cpu_family_init, ARCH_SPARC);" >> config.h
CPU_ARCHS="$CPU_ARCHS cpu_sparc.o memory_sparc.o"
CPU_TOOLS="$CPU_TOOLS generate_sparc_loadstore"

printf "\n" >> config.h


###############################################################################
#
#  Special hacks for some host OSes:
#
###############################################################################

if [ z"`uname|cut -c 1-6`" = zCYGWIN ]; then
        CYGWIN=YES

        if [ z"$CC" = z ]; then
                #  Assume gcc on Cygwin (Windows) systems.
                CC=gcc
        fi
fi

if [ z"`uname`" = zHP-UX ]; then
        HPUX=YES

        if [ z$CC = z ]; then
                if [ -f /usr/local/pa64/bin/gcc ]; then
                        CC=/usr/local/pa64/bin/gcc
                fi
        fi
fi

if [ z"`uname`" = zOSF1 ]; then
        OSF1=YES
fi


###############################################################################
#
#  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. (GCC on Solaris is known to be completely
#  broken, for instance.)

echo '#include <stdio.h>

int main(int argc, char *argv[])
{
        static int x = 0;
        static int y = 1;
        printf("%i,%i", x, y);
        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
        #  Try gcc first:
        printf "#!/bin/sh\ngcc $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
        if [ -x _testprog ]; then
                if [ z`./_testprog` = z0,1 ]; then
                        CC=gcc
                else
                        printf "broken gcc detected\n"
                        printf "The test program:\n\n"
                        cat _testprog.c
                        printf "\nshould have resulted in 0,1, but the"
                        printf " result was: "
                        ./_testprog
                        printf "\n\nchecking for other C compilers... "
                fi
        fi
        rm -f _testprog

        #  If both gcc and cc exist, then cc might be a vendor specific
        #  compiler which produces faster code than gcc (eg on Solaris):
        printf "#!/bin/sh\ncc $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
        if [ -x _testprog ]; then
                if [ z`./_testprog` = z0,1 ]; then
                        CC=cc
                else
                        printf "broken cc detected\n"
                        printf "checking for other C compilers... "
                fi
        fi
        rm -f _testprog

#  Actually, don't try ccc on Alpha. ccc generates broken code :(

#       #  Try ccc (FreeBSD/Alpha):
#       printf "#!/bin/sh\nccc $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
#       if [ -x _testprog ]; then
#               CC="ccc"
#       fi
#       rm -f _testprog

        rm -f _test.sh
fi


rm -f _testprog

if [ z$CC = z ]; then
        printf "no working compiler detected\n"
        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.\n"
        exit
fi

printf "$CC $CFLAGS"


CCTYPE="generic"

if $CC $CFLAGS -V 2> /dev/null | grep ompaq 1> /dev/null 2> /dev/null; then
        COMPAQCC=YES
        CCTYPE="Compaq CC"
fi

if $CC $CFLAGS -V 2>&1 | grep Sun 1> /dev/null 2> /dev/null; then
        SUNCC=YES
        CCTYPE="Solaris CC"
fi

if $CC $CFLAGS -v 2>&1 | grep gcc 1> /dev/null 2> /dev/null; then
        GCCCC=YES
        CCTYPE="GNU CC"
fi

if [ z$CYGWIN = zYES ]; then
        CCTYPE="$CCTYPE (Cygwin)"
fi

echo " ($CCTYPE)"


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[])
        { 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"
        $CC $CFLAGS _test_x11.o -o _test_x11 $XLIB 2> /dev/null

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

        if [ z`uname` = zNetBSD ]; then
                echo "Using NetBSD hack for X11 libs..."
                XLIB="$XLIB -Wl,-rpath,/usr/X11R6/lib"
        fi

        if [ z`uname` = zOpenBSD ]; then
                if [ z`uname -m` = zarc ]; then
                        echo "Using old OpenBSD/arc hack for X11 libs..."
                        XLIB="$XLIB -Wl,-rpath,/usr/X11R6/lib"
                fi
        fi

        if [ z$XOK = z0 ]; then
                echo "Failed to compile X11 test program." \
                    "Configuring without X11."
        else
                printf "X11 headers: $XINCLUDE\n"
                printf "X11 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


#  Check for 'alpha' define.
printf "checking for 'alpha' define... "
printf "#include <stdio.h>\nint main(int argc, char *argv[]){
#ifdef alpha
printf(\"1\");
#undef alpha
#ifdef alpha
printf(\"2\");
#endif
#endif
printf(\"\\\n\");return 0;}\n" > _testm.c
$CC $CFLAGS _testm.c -o _testm 2> /dev/null
if [ ! -x _testm ]; then
        printf "\nWARNING! COULD NOT COMPILE alpha define TEST"
        printf " PROGRAM AT ALL!\n"
else
        if [ z`./_testm` = z1 ]; then
                printf "yes, workaround applied\n"
                echo "#undef alpha" >> config.h
        else
                if [ z`./_testm` = z12 ]; then
                        printf "yes, but workaround not possible\n"
                        exit
                else
                        printf "no\n"
                fi
        fi
fi
rm -f _testm*


#  Some OSes on MIPS seems to define 'mips' to 1. (eg OpenBSD/arc)
printf "checking for 'mips' define... "
printf "#include <stdio.h>\nint main(int argc, char *argv[]){
#ifdef mips
printf(\"1\");
#undef mips
#ifdef mips
printf(\"2\");
#endif
#endif
printf(\"\\\n\");return 0;}\n" > _testm.c
$CC $CFLAGS _testm.c -o _testm 2> /dev/null
if [ ! -x _testm ]; then
        printf "\nWARNING! COULD NOT COMPILE mips define TEST"
        printf " PROGRAM AT ALL!\n"
else
        if [ z`./_testm` = z1 ]; then
                printf "yes, workaround applied\n"
                echo "#undef mips" >> config.h
        else
                if [ z`./_testm` = z12 ]; then
                        printf "yes, but workaround not possible\n"
                        exit
                else
                        printf "no\n"
                fi
        fi
fi
rm -f _testm*


#  Similar to the mips define check above, although I don't know if
#  any OS actually defined ppc like this.
printf "checking for 'ppc' define... "
printf "#include <stdio.h>\nint main(int argc, char *argv[]){
#ifdef ppc
printf(\"1\");
#undef ppc
#ifdef ppc
printf(\"2\");
#endif
#endif
printf(\"\\\n\");return 0;}\n" > _testm.c
$CC $CFLAGS _testm.c -o _testm 2> /dev/null
if [ ! -x _testm ]; then
        printf "\nWARNING! COULD NOT COMPILE ppc define TEST"
        printf " PROGRAM AT ALL!\n"
else
        if [ z`./_testm` = z1 ]; then
                printf "yes, workaround applied\n"
                echo "#undef ppc" >> config.h
        else
                if [ z`./_testm` = z12 ]; then
                        printf "yes, but workaround not possible\n"
                        exit
                else
                        printf "no\n"
                fi
        fi
fi
rm -f _testm*


#  Similar to the mips define check above, although I don't know if
#  any OS actually defined sparc like this.
printf "checking for 'sparc' define... "
printf "#include <stdio.h>\nint main(int argc, char *argv[]){
#ifdef sparc
printf(\"1\");
#undef sparc
#ifdef sparc
printf(\"2\");
#endif
#endif
printf(\"\\\n\");return 0;}\n" > _testm.c
$CC $CFLAGS _testm.c -o _testm 2> /dev/null
if [ ! -x _testm ]; then
        printf "\nWARNING! COULD NOT COMPILE sparc define TEST "
        printf "PROGRAM AT ALL!\n"
else
        if [ z`./_testm` = z1 ]; then
                printf "yes, workaround applied\n"
                echo "#undef sparc" >> config.h
        else
                if [ z`./_testm` = z12 ]; then
                        printf "yes, but workaround not possible\n"
                        exit
                else
                        printf "no\n"
                fi
        fi
fi
rm -f _testm*


#  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"

        #  Compaq's compiler always seems to warn about the long long type,
        #  and unusedtop suppresses warnings about include files being
        #  included more than once.
        if [ z"$COMPAQCC" = zYES ]; then
                CWARNINGS="$CWARNINGS -msg_disable longlongtype,unusedtop"
        fi

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


#  -Wstrict-aliasing
if [ ! z"$DEBUG" = zYES ]; then
        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 frame _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
fi


if [ z"$COMPAQCC" = zYES ]; then
        #  -O4 is possible, but sometimes -O3 is better?
        if [ ! z"$DEBUG" = zYES ]; then
                CFLAGS="-O4 $CFLAGS"
        fi
else
        if [ z"`uname`" = zSunOS ]; then
                #  "cc", the system's default compiler:
                if [ ! z"$DEBUG" = zYES ]; then
                        if [ z"$SUNCC" = zYES ]; then
                                CFLAGS="-xO5 -xdepend $CFLAGS"
                        fi
                fi
                printf "#define SOLARIS\n" >> config.h
                OTHERLIBS="-lsocket $OTHERLIBS"
        else
                #  gcc or something else:
                if [ ! z"$DEBUG" = zYES ]; then
                        $CC $CFLAGS _testprog.c -o _testprog -O 2> /dev/null
                        if [ -x _testprog ]; then
                                rm -f _testprog
                                $CC $CFLAGS _testprog.c -o _testprog    \
                                        -O3 2> /dev/null
                                if [ -x _testprog ]; then
                                        CFLAGS="-O3 $CFLAGS"
                                else
                                        CFLAGS="-O $CFLAGS"
                                fi
                        fi
                fi
        fi
fi
rm -f _testprog


#  -fschedule-insns causes bugs on i386 with gcc,
#  but works OK on my alpha with ccc (compaq's cc).
if [ ! z"$DEBUG" = zYES ]; then
    if [ z"$COMPAQCC" = zYES ]; then
        printf "checking whether -fschedule-insns2 can be used... "
        $CC $CFLAGS _testprog.c -o _testprog -fschedule-insns2 2> /dev/null
        if [ -x _testprog ]; then
                CFLAGS="-fschedule-insns2 $CFLAGS"
                printf "yes\n"
        else
                printf "no\n"
        fi
        rm -f _testprog

        printf "checking whether -fschedule-insns can be used... "
        $CC $CFLAGS _testprog.c -o _testprog -fschedule-insns 2> /dev/null
        if [ -x _testprog ]; then
                CFLAGS="-fschedule-insns $CFLAGS"
                printf "yes\n"
        else
                printf "no\n"
        fi
        rm -f _testprog

        #  -intrinsics
        printf "checking whether -intrinsics can be used... "
        $CC $CFLAGS _testprog.c -o _testprog -intrinsics 2> /dev/null
        if [ -x _testprog ]; then
                CFLAGS="-intrinsics $CFLAGS"
                printf "yes\n"
        else
                printf "no\n"
        fi
        rm -f _testprog

        #  -fast
        printf "checking whether -fast can be used... "
        $CC $CFLAGS _testprog.c -o _testprog -fast 2> /dev/null
        if [ -x _testprog ]; then
                CFLAGS="-fast $CFLAGS"
                printf "yes\n"
        else
                printf "no\n"
        fi
        rm -f _testprog
fi; fi


#  -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 frame _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 development builds
if [ z"$UNSTABLE" = zYES ]; then
        printf "checking whether -g can be used... "
        if [ z"$COMPAQCC" = zYES ]; then
                $CC $CFLAGS -g3 _testprog.c -o _testprog > _testprog.stdout 2>&1
                cat _testprog.stdout >> _testprog.error
                if [ -x _testprog ]; then
                        CFLAGS="-g3 $CFLAGS"
                        printf "yes (-g3)\n"
                else
                        printf "no\n"
                fi
        else
                $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
        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.[co] _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.[co] _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.[co] _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.[co] _tests


#  mkstemp missing?
printf "checking for mkstemp... "
printf "#include <unistd.h>
int main(int argc, char *argv[]) { int x; char *y = \"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\n"
        printf "#define mkstemp mymkstemp\n" >> config.h
else
        printf "found\n"
fi
rm -f _tests.[co] _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.[co] _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.[co] _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.[co] _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
                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
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 __FUNCTION__... "
printf "#include <stdio.h>\n\nint main(int argc, char *argv[]) {
  if (__FUNCTION__) printf(__FUNCTION__);\n  return 0;\n}\n" > _testfunction.c
$CC $CFLAGS _testfunction.c -o _testfunction 2> /dev/null
if [ ! -x _testfunction ]; then
        printf "no\n"
else
        if [ z`./_testfunction` = zmain ]; then
                printf "yes\n"
                printf "#define HAVE___FUNCTION__\n" >> config.h
        else
                printf "no\n"
        fi
fi
rm -f _testfunction*


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

#  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*


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

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

rm -f _testprog.c

echo C compiler flags: $CFLAGS $CWARNINGS
echo Linker flags: $OTHERLIBS
echo "CWARNINGS=$CWARNINGS" >> _Makefile.header
echo "COPTIM=$CFLAGS" >> _Makefile.header
echo "INCLUDE=$INCLUDE" >> _Makefile.header
echo "DINCLUDE=$DINCLUDE" >> _Makefile.header
echo "CC=$CC" >> _Makefile.header
echo "OTHERLIBS=$OTHERLIBS" >> _Makefile.header
echo "CPU_ARCHS=$CPU_ARCHS" >> _Makefile.header
echo "CPU_TOOLS=$CPU_TOOLS" >> _Makefile.header
echo "" >> _Makefile.header


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

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

#  Remove temporary Makefile header:
rm -f _Makefile.header

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