configure.in

dnl == autoconf source for the Glasgow FP tools ==
dnl (run "grep '^dnl \*' configure.in | sed -e 's/dnl / /g; s/\*\*/   +/g;'"
dnl  (or some such) to see the outline of this file)
dnl
#
# (c) The AQUA Project, Glasgow University, 1994-1998
#
# Configure script template for the Glasgow functional programming tools
#
# Process with 'autoconf' to get a working configure script.
#
# For the generated configure script, do "./configure --help" to
# see what flags are available. (Better yet, read the documentation!)
#

# First off, a distrib sanity check..
AC_INIT(mk/config.mk.in)

dnl * Declare subdirectories that have a private configure script
dnl
dnl After the toplevel configuration is complete, the script will recurse into
dnl these subdirectories (the use of cache values makes repeated checks cheap)
AC_CONFIG_SUBDIRS(ghc)

# -------------------------------------------------------------------------
# Prepare to generate the following header files
#
#
AC_CONFIG_HEADER(mk/config.h)

# No, semi-sadly, we don't do `--srcdir'...
if test x"$srcdir" != 'x.' ; then
    echo "This configuration does not support the \`--srcdir' option.."
    exit 1
fi

#
# Remove common automounter nonsense + convert from UNC to DOS style paths
# (UNC awareness isn't quite there yet for cygwin32-beta18 and consituent tools.)
#
hardtop=`pwd`
hardtop=`echo $hardtop | sed 's|^/tmp_mnt.*\(/local/.*\)$|\1|' | sed 's|^/tmp_mnt/|/|' | sed 's|^/grasp_tmp|/local/grasp_tmp|' | sed 's|^//\(.\)/|\1:/|' `

echo ''
echo "*** The top of your build tree is: $hardtop"
AC_SUBST(hardtop)

dnl--------------------------------------------------------------------
dnl * Choose host(/target/build) platform
dnl--------------------------------------------------------------------

dnl Guess host/target/build platform(s) if necessary.
AC_CANONICAL_SYSTEM

# "$host" defaults to "$target"
if test "x$host" = xNONE ; then
    host=$target
fi

dnl ** canonicalize platform names
BuildPlatform=`/bin/sh $srcdir/config.sub $build` || exit 1
HostPlatform=`/bin/sh $srcdir/config.sub $host` || exit 1
TargetPlatform=`/bin/sh $srcdir/config.sub $target` || exit 1

if test x"$TargetPlatform" != x"$HostPlatform" ; then
    echo "GHC configuration does not support differing host/target (i.e., cross-compiling)"
    exit 1
fi

exeext=''
#
# The following will be more difficult when we *are* cross-compiling.
# Suitable names to slam in *_CPP are in platform.h.in.
# We also record the architecture, vendor, and operating system (OS)
# separately.
case $HostPlatform in
alpha-dec-osf[[12]]*)
	HostPlatform=alpha-dec-osf1   # canonicalise for our purposes
	TargetPlatform=alpha-dec-osf1 # this will work for now... (hack)
	BuildPlatform=alpha-dec-osf1  # hack
        HostPlatform_CPP='alpha_dec_osf1'
        HostArch_CPP='alpha'
        HostVendor_CPP='dec'
        HostOS_CPP='osf1'
        ;;
alpha-dec-osf[[34]]*)
	HostPlatform=alpha-dec-osf3   # canonicalise for our purposes
	TargetPlatform=alpha-dec-osf3 # this will work for now... (hack)
	BuildPlatform=alpha-dec-osf3  # hack
        HostPlatform_CPP='alpha_dec_osf3'
        HostArch_CPP='alpha'
        HostVendor_CPP='dec'
        HostOS_CPP='osf3'
        ;;
alpha-unknown-linux)
	HostPlatform=alpha-unknown-linux
	TargetPlatform=alpha-unknown-linux
	BuildPlatform=alpha-unknown-linux
        HostPlatform_CPP='alpha_unknown_linux'
        HostArch_CPP='alpha'
        HostVendor_CPP='unknown'
        HostOS_CPP='linux'
        ;;
alpha-unknown-freebsd*)
	HostPlatform=alpha-unknown-freebsd
	TargetPlatform=alpha-unknown-freebsd
	BuildPlatform=alpha-unknown-freebsd
        HostPlatform_CPP='alpha_unknown_freebsd'
        HostArch_CPP='alpha'
        HostVendor_CPP='unknown'
        HostOS_CPP='freebsd'
        ;;
hppa1.1-hp-hpux*)
	HostPlatform=hppa1.1-hp-hpux  # canonicalise for our purposes (hack)
	TargetPlatform=hppa1.1-hp-hpux
	BuildPlatform=hppa1.1-hp-hpux
        HostPlatform_CPP='hppa1_1_hp_hpux'
        HostArch_CPP='hppa1_1'
        HostVendor_CPP='hp'
        HostOS_CPP='hpux'
        ;;
i[[3456]]86-*-linuxaout*)
	HostPlatform=i386-unknown-linuxaout   # hack again
	TargetPlatform=i386-unknown-linuxaout
	BuildPlatform=i386-unknown-linuxaout
        HostPlatform_CPP='i386_unknown_linuxaout'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='linuxaout'
        ;;
i[[3456]]86-*-linux*)
	HostPlatform=i386-unknown-linux # hack again
	TargetPlatform=i386-unknown-linux
	BuildPlatform=i386-unknown-linux
        HostPlatform_CPP='i386_unknown_linux'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='linux'
        ;;
i[[3456]]86-*-freebsd[[3-9]]*) # FreeBSD 3.0+ uses ELF
	HostPlatform=i386-unknown-freebsd # hack again
	TargetPlatform=i386-unknown-freebsd
	BuildPlatform=i386-unknown-freebsd
        HostPlatform_CPP='i386_unknown_freebsd'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='freebsd'
        ;;
i[[3456]]86-*-freebsd2*) # Older FreeBSDs are a.out
	HostPlatform=i386-unknown-freebsd2 # hack again
	TargetPlatform=i386-unknown-freebsd2
	BuildPlatform=i386-unknown-freebsd2
        HostPlatform_CPP='i386_unknown_freebsd2'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='freebsd2'
        ;;
i[[3456]]86-*-netbsd*)
	HostPlatform=i386-unknown-netbsd # hack again
	TargetPlatform=i386-unknown-netbsd
	BuildPlatform=i386-unknown-netbsd
        HostPlatform_CPP='i386_unknown_netbsd'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='netbsd'
        ;;
i[[3456]]86-*-solaris2*)
	HostPlatform=i386-unknown-solaris2 # hack again
	TargetPlatform=i386-unknown-solaris2
	BuildPlatform=i386-unknown-solaris2
        HostPlatform_CPP='i386_unknown_solaris2'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='solaris2'
        ;;
i[[3456]]86-*-cygwin32*)
	HostPlatform=i386-unknown-cygwin32 # hack again
	TargetPlatform=i386-unknown-cygwin32
	BuildPlatform=i386-unknown-cygwin32
        HostPlatform_CPP='i386_unknown_cygwin32'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='cygwin32'
	exeext='.exe'
        ;;
i[[3456]]86-*-mingw32*)
	HostPlatform=i386-unknown-mingw32 # hack again
	TargetPlatform=i386-unknown-mingw32
	BuildPlatform=i386-unknown-mingw32
        HostPlatform_CPP='i386_unknown_mingw32'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='mingw32'
	exeext='.exe'
	# We assume you're using mingw32 via the gcc that comes
	# with cygwin, and not the native port, so let's augment
	# the gcc command-line used here with -mno-cygwin to
	# arrange for good things to happen.
	CFLAGS="-mno-cygwin $CFLAGS"
        ;;
m68k-next-nextstep2)
        HostPlatform_CPP='m68k_next_nextstep2'
        HostArch_CPP='m68k'
        HostVendor_CPP='next'
        HostOS_CPP='nextstep2'
        ;;
m68k-next-nextstep3)
        HostPlatform_CPP='m68k_next_nextstep3'
        HostArch_CPP='m68k'
        HostVendor_CPP='next'
        HostOS_CPP='nextstep3'
        ;;
i[[3456]]86-next-nextstep3)
	HostPlatform=i386-next-nextstep3 # hack again
	TargetPlatform=i386-next-nextstep3
	BuildPlatform=i386-next-nextstep3
        HostPlatform_CPP='i386_next_nextstep3'
        HostArch_CPP='i386'
        HostVendor_CPP='next'
        HostOS_CPP='nextstep3'
        ;;
m68k-sun-sunos4*)
	HostPlatform=m68k-sun-sunos4
	TargetPlatform=m68k-sun-sunos4 #hack
	BuildPlatform=m68k-sun-sunos4 #hack
        HostPlatform_CPP='m68k_sun_sunos4'
        HostArch_CPP='m68k'
        HostVendor_CPP='sun'
        HostOS_CPP='sunos4'
        ;;
mips-dec-ultrix*)
        HostPlatform_CPP='mips_dec_ultrix'
        HostArch_CPP='mipsel'   # NB a little different
        HostVendor_CPP='dec'
        HostOS_CPP='ultrix'
        ;;
mips-sgi-irix*)
	HostPlatform=mips-sgi-irix
	TargetPlatform=mips-sgi-irix #hack
	BuildPlatform=mips-sgi-irix #hack
        HostPlatform_CPP='mips_sgi_irix'
        HostArch_CPP='mipseb'   # NB a little different
        HostVendor_CPP='sgi'
        HostOS_CPP='irix'
        ;;
rs6000-ibm-aix*)
	HostPlatform=rs6000-ibm-aix
	TargetPlatform=rs6000-ibm-aix #hack
	BuildPlatform=rs6000-ibm-aix #hack
        HostPlatform_CPP='rs6000_ibm_aix'
        HostArch_CPP='rs6000'
        HostVendor_CPP='ibm'
        HostOS_CPP='aix'
        ;;
powerpc-ibm-aix*)
	HostPlatform=powerpc-ibm-aix
	TargetPlatform=powerpc-ibm-aix #hack
	BuildPlatform=powerpc-ibm-aix #hack
        HostPlatform_CPP='powerpc_ibm_aix'
        HostArch_CPP='powerpc'
        HostVendor_CPP='ibm'
        HostOS_CPP='aix'
        ;;
sparc-sun-sunos4*)
	HostPlatform=sparc-sun-sunos4
	TargetPlatform=sparc-sun-sunos4 #hack
	BuildPlatform=sparc-sun-sunos4 #hack
        HostPlatform_CPP='sparc_sun_sunos4'
        HostArch_CPP='sparc'
        HostVendor_CPP='sun'
        HostOS_CPP='sunos4'
        ;;
sparc-sun-solaris2*)
	HostPlatform=sparc-sun-solaris2
	TargetPlatform=sparc-sun-solaris2 #hack
	BuildPlatform=sparc-sun-solaris2 #hack
        HostPlatform_CPP='sparc_sun_solaris2'
        HostArch_CPP='sparc'
        HostVendor_CPP='sun'
        HostOS_CPP='solaris2'
        ;;
*)
        echo "Unrecognised platform: $HostPlatform"
        exit 1
        ;;
esac
echo "Canonicalised to: $HostPlatform"
test  x"$HostPlatform" != x"$TargetPlatform" && echo "Target platform set to $TargetPlatform"
test  x"$BuildPlatform" != x"$HostPlatform"  && echo "Build platform set to $BuildPlatform"

BuildPlatform_CPP=$HostPlatform_CPP
TargetPlatform_CPP=$HostPlatform_CPP
BuildArch_CPP=$HostArch_CPP
TargetArch_CPP=$HostArch_CPP
BuildOS_CPP=$HostOS_CPP
HostOS_Full=$host_os
TargetOS_CPP=$HostOS_CPP
BuildVendor_CPP=$HostVendor_CPP
TargetVendor_CPP=$HostVendor_CPP

dnl Cannot afford all these SUBSTs (because of braindead seds w/ 99 cmd limits)
dnl AC_SUBST(BuildPlatform)

AC_SUBST(HostPlatform)
AC_SUBST(TargetPlatform)
AC_SUBST(HostPlatform_CPP)
dnl AC_SUBST(BuildPlatform_CPP)
dnl AC_SUBST(TargetPlatform_CPP)

AC_SUBST(HostArch_CPP)
dnl AC_SUBST(BuildArch_CPP)
dnl AC_SUBST(TargetArch_CPP)

AC_SUBST(HostOS_CPP)
AC_SUBST(HostOS_Full)
dnl AC_SUBST(BuildOS_CPP)
dnl AC_SUBST(TargetOS_CPP)

AC_SUBST(HostVendor_CPP)
dnl AC_SUBST(BuildVendor_CPP)
dnl AC_SUBST(TargetVendor_CPP)

AC_SUBST(exeext)

AC_PATH_PROG(GHC,ghc)
AC_PATH_PROGS(NHC,nhc nhc98)
AC_PATH_PROG(HBC,hbc)

dnl --------------------------------------------------------------
dnl * Project specific configuration options
dnl --------------------------------------------------------------
dnl What follows is a bunch of options that can either be configured
dnl through command line options to the configure script or by
dnl supplying defns in the build tree's mk/build.mk. Having the option to
dnl use either is considered a Feature.

dnl ** What command to use to compile compiler sources ?
dnl --------------------------------------------------------------
AC_ARG_WITH(hc,
[  --with-hc=<haskell compiler>
        Use a command different from 'ghc' to compile up Haskell code.
        (no claims currently made that this will work with a compiler other than a
         recent version of GHC, but you could always try...)
],
[WithHc="$withval"],
[WithHc=$GHC]
)
AC_SUBST(WithHc)

dnl ** Which gcc to use?
dnl --------------------------------------------------------------
AC_ARG_WITH(gcc,
[  --with-gcc=<gcc command>
        Use a different command instead of 'gcc' for the GNU C compiler.
],
[WhatGccIsCalled="$withval"],
[WhatGccIsCalled="gcc"]
)
AC_SUBST(WhatGccIsCalled)

dnl ** Booting from .hc files?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(hc-boot,
[  --enable-hc-boot
        Boot the Glasgow Haskell Compiler from intermediate .hc files.
        (This option is mostly of interest to porters.)
],
[BootingFromHc=YES],
[BootingFromHc=NO]
)
AC_SUBST(BootingFromHc)


dnl ** Enable the construction of Win32 DLLs?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(win32-dlls,
[  --enable-win32-dlls
        If on a Win32 platform running mingw32/cygwin, enable the
	construction of DLLs containing ghc-compiled code.
],
[
case $HostOS_CPP in
cygwin32) ;;
mingw32)  ;;
*)    echo "Unrecognised win32 platform: $HostPlatform"
      exit 1
      ;;
esac
EnableWin32DLLs=YES
],
[EnableWin32DLLs=NO]
)
AC_SUBST(EnableWin32DLLs)
if test x"$EnableWin32DLLs" = "xYES" ; then
 AC_DEFINE(HAVE_WIN32_DLL_SUPPORT)
fi

dnl --------------------------------------------------------------
dnl End of configure script option section
dnl --------------------------------------------------------------


dnl --------------------------------------------------------------
dnl * General configuration checks
dnl --------------------------------------------------------------

dnl ** does #! work?
AC_SYS_INTERPRETER()

dnl ** look for `perl', but watch out for version 4.035
AC_PATH_PROG(PerlCmd,perl)
if test -z "$PerlCmd"; then
   echo "You must install perl before you can continue"
   echo "Perhaps it is already installed, but not in your PATH?"
   exit 1
else
FPTOOLS_CHECK_PERL_VERSION
fi

dnl ** does #! path/to/perl work? (sometimes it's too long...)
FPTOOLS_SHEBANG_PERL


dnl ** look for GCC and find out which version
dnl     Figure out which C compiler to use.  Gcc is preferred.
dnl     If gcc, make sure it's at least 2.1
dnl
AC_PROG_CC
FPTOOLS_HAVE_GCC

dnl ** figure out how to invoke cpp directly (gcc -E is no good)
AC_PROG_CPP

dnl ** figure out how to do context diffs
FPTOOLS_PROG_DIFF

dnl ** Find find command (for Win32's benefit)
AC_PATH_PROG(FindCmd, find)

dnl ** look for a decent parser generator (bison preferred)
dnl (FPTOOLS_PROG_YACCY is AC_PROG_YACC, but with some extra testing 
dnl  on the suitability of the 'yacc' returned.)
FPTOOLS_PROG_YACCY

dnl ** Find lex command (lex or flex) and library (-ll or -lfl)
dnl     ( not that we care about the latter, see mk/config.mk.in )
AC_PROG_LEX


dnl ** figure out how to do a BSD-ish install
AC_PROG_INSTALL

dnl If you can run configure, you certainly have /bin/sh
AC_DEFINE(HAVE_BIN_SH)

dnl ** how to invoke `ar' and `ranlib'
FPTOOLS_PROG_AR_AND_RANLIB


dnl ** Check to see whether ln -s works
AC_PROG_LN_S


dnl ** Find the path to sed
AC_PATH_PROG(SedCmd,sed)


dnl ** check for time command
AC_PATH_PROG(TimeCmd,time)


dnl ** check for tar
dnl   if GNU tar is named gtar, look for it first.
AC_PATH_PROGS(TarCmd,gtar tar,tar)

dnl ** check for gzip/compress
AC_PATH_PROGS(CompressCmd,gzip compress,gzip)

compress_nm=`basename $CompressCmd`
if test x"$compress_nm" = xgzip; then
  CompressCmd="$CompressCmd -d"
  CompressSuffix="gz"
else
  CompressSuffix="Z"
fi
AC_SUBST(CompressCmd)
AC_SUBST(CompressSuffix)

dnl ** check for installed happy binary + version
dnl    (don't do it if we're booting from .hc files though.)
if (test "$BootingFromHc" = "NO"); then
FPTOOLS_HAPPY
fi;

dnl --------------------------------------------------
dnl ### program checking section ends here ###
dnl --------------------------------------------------

dnl --------------------------------------------------
dnl * Platform header file and syscall feature tests
dnl ### checking the state of the local header files and syscalls ###

dnl ** check for full ANSI header (.h) files
AC_HEADER_STDC

dnl ** check for specific header (.h) files that we are interested in
AC_CHECK_HEADERS(Files.h assert.h console.h ctype.h dirent.h errno.h fcntl.h float.h ftw.h grp.h ieee754.h malloc.h memory.h nlist.h pascal.h pwd.h sgtty.h siginfo.h signal.h stat.h stdint.h stdlib.h stdarg.h string.h sys/fault.h sys/file.h sys/ioctl.h sys/limits.h sys/mman.h sys/param.h sys/procfs.h sys/resource.h sys/signal.h sys/socket.h netinet/tcp.h sys/stat.h sys/syscall.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/types.h sys/utsname.h sys/vadvise.h sys/wait.h termio.h termios.h time.h types.h unistd.h utime.h values.h vfork.h bfd.h winsock.h)

AC_CHECK_HEADER(readline/readline.h, HaveReadlineReadlineH=YES, HaveReadlineReadlineH=NO)
AC_CHECK_HEADER(readline/history.h, HaveReadlineHistoryH=YES, HaveReadlineHistoryH=NO)

if test $HaveReadlineReadlineH = YES && test $HaveReadlineHistoryH = YES ; then
  HaveReadlineHeaders=YES
  AC_DEFINE(HAVE_READLINE_HEADERS,1)
else
  HaveReadlineHeaders=NO
  AC_DEFINE(HAVE_READLINE_HEADERS,0)
fi
AC_SUBST(HaveReadlineHeaders)

dnl ** check for DOS include files
AC_CHECK_HEADERS(dos.h conio.h io.h std.h) 

dnl ** check for Windows include files
AC_CHECK_HEADERS(windows.h)

dnl ** check if it is safe to include both <time.h> and <sys/time.h>
AC_HEADER_TIME

dnl dynamic loading include files
AC_CHECK_HEADERS(dlfcn.h dl.h) 

dnl ** check for farcalloc (in bcc)
AC_CHECK_HEADER(alloc.h,AC_CHECK_FUNCS(farcalloc))

dnl ** check for valloc (in sunos, solaris, mips, amiga, next, minix, ultrix)
AC_CHECK_HEADER(malloc.h,AC_CHECK_FUNCS(valloc))

dnl ** how do we get a timezone name, and UTC offset ?
AC_STRUCT_TIMEZONE

dnl ** what's the type of timezone?
FPTOOLS_HAVE_TIMEZONE
FPTOOLS_TYPE_TIMEZONE

dnl ** do we have altzone?
FPTOOLS_ALTZONE

dnl ** does struct stat contain st_blksize?
AC_STRUCT_ST_BLKSIZE

dnl ** do we have long longs?
FPTOOLS_C_LONG_LONG

dnl ** what are the sizes of various types
dnl    (these must come before GHC_CHECK_ALIGNMENT)
AC_CHECK_SIZEOF(char,               1)
AC_CHECK_SIZEOF(double,             8)
AC_CHECK_SIZEOF(float,              4)
AC_CHECK_SIZEOF(int,                4)
AC_CHECK_SIZEOF(long,               4)
if test "$fptools_cv_have_long_long" = yes; then
AC_CHECK_SIZEOF(long long,          8)
fi
AC_CHECK_SIZEOF(short,              2)
AC_CHECK_SIZEOF(unsigned char,      1)
AC_CHECK_SIZEOF(unsigned int,       4)
AC_CHECK_SIZEOF(unsigned long,      4)
if test "$fptools_cv_have_long_long" = yes; then
AC_CHECK_SIZEOF(unsigned long long, 8)
fi
AC_CHECK_SIZEOF(unsigned short,     2)
AC_CHECK_SIZEOF(void *,             4)

dnl ** what are alignment constraints on various types
FPTOOLS_CHECK_ALIGNMENT(char)
FPTOOLS_CHECK_ALIGNMENT(double)
FPTOOLS_CHECK_ALIGNMENT(float)
FPTOOLS_CHECK_ALIGNMENT(int)
FPTOOLS_CHECK_ALIGNMENT(long)
if test "$fptools_cv_have_long_long" = yes; then
FPTOOLS_CHECK_ALIGNMENT(long long)
fi
FPTOOLS_CHECK_ALIGNMENT(short)
FPTOOLS_CHECK_ALIGNMENT(unsigned char)
FPTOOLS_CHECK_ALIGNMENT(unsigned int)
FPTOOLS_CHECK_ALIGNMENT(unsigned long)
if test "$fptools_cv_have_long_long" = yes; then
FPTOOLS_CHECK_ALIGNMENT(unsigned long long)
fi
FPTOOLS_CHECK_ALIGNMENT(unsigned short)
FPTOOLS_CHECK_ALIGNMENT(void *)

dnl ** can we open files in binary mode?
FPTOOLS_O_BINARY

dnl ** check for GetModuleFileName and WinExec (windows only)
dnl Old: AC_CHECK_FUNCS(WinExec GetModuleFileName)       dnl Windows
dnl Doesn't work because the linker can't see the functions if
dnl you omit the #include <windows.h>.  (I've no idea why not...)

FPTOOLS_TRY_LINK_NOWARN(,[
#if HAVE_WINDOWS_H
#include <windows.h>
#endif
main() { 
  WinExec("",0);
  exit(0);
}
],
[have_winexec=1],
[have_winexec=0])
if test "$have_winexec" = "1"; then
AC_DEFINE(HAVE_WINEXEC)
fi

FPTOOLS_TRY_LINK_NOWARN(,[
#if HAVE_WINDOWS_H
#include <windows.h>
#endif
main() { 
  char* dir;
  GetModuleFileName((HMODULE)0,dir,0);
  exit(0);
}
],
[have_getmodulefilename=1],
[have_getmodulefilename=0])
if test "$have_getmodulefilename" = "1"; then
AC_DEFINE(HAVE_GETMODULEFILENAME)
fi

dnl ** check return type of signal handlers
dnl Foo: assumes we can use prototypes.
dnl On BCC, signal handlers have type "int(void)", elsewhere its "void(int)".
dnl AC_CACHE_CHECK([type of signal handlers], ac_cv_type_signal_handler,
dnl [AC_TRY_COMPILE([#include <sys/types.h>
dnl #include <signal.h>
dnl #ifdef signal
dnl #undef signal
dnl #endif
dnl void (*signal (int, void (*)(int)))(int);
dnl ],
dnl [int i;], 
dnl ac_cv_type_signal_handler=void_int,
dnl ac_cv_type_signal_handler=int_void)])
dnl if test "$ac_cv_type_signal_handler" = void_int; then
dnl AC_DEFINE(VOID_INT_SIGNALS)
dnl fi

dnl On BCC, signal handlers have type "int(void)", elsewhere its "void(int)".
AC_TYPE_SIGNAL
if test "$ac_cv_type_signal" = void; then
AC_DEFINE(VOID_INT_SIGNALS)
fi

dnl ** check for more functions
AC_CHECK_FUNCS(strcasecmp _stricmp stricmp strcmpi)
AC_CHECK_FUNCS(strcmp)
AC_CHECK_FUNCS(realpath _fullpath)  
AC_CHECK_FUNCS(PBHSetVolSync macsystem)  
AC_CHECK_FUNCS(fgetpos fsetpos fseek ftell)
AC_CHECK_FUNCS(vsnprintf _vsnprintf)
AC_CHECK_FUNCS(snprintf  _snprintf )  
AC_CHECK_FUNCS(popen     _popen )  
AC_CHECK_FUNCS(pclose    _pclose )  


dnl ** check for specific library functions that we are interested in
AC_CHECK_FUNCS(access ftime getclock getpagesize getrusage gettimeofday mktime mprotect readlink setitimer stat symlink sysconf timelocal times vadvise vfork)

dnl ** check whether this machine has gmp2 installed
AC_CHECK_LIB(gmp,  mpz_fdiv_qr, HaveLibGmp=YES; LibGmp=gmp,
  AC_CHECK_LIB(gmp2, mpz_fdiv_qr,  HaveLibGmp=YES; LibGmp=gmp2,
    HaveLibGmp=No; LibGmp=not-installed))
AC_SUBST(HaveLibGmp)
AC_SUBST(LibGmp)

dnl ** check whether this machine has BFD and liberty installed (used for debugging)
dnl    the order of these tests matters: bfd needs liberty
AC_CHECK_LIB(iberty, xmalloc)
AC_CHECK_LIB(bfd,    bfd_init)

dnl ** check for readline, for Hugs and hslibs' Readline
dnl ncurses supersedes termcap and curses, but for compatibility,
dnl we have to check for all...
AC_CHECK_LIB(ncurses, tputs, HaveLibTermcap=YES; LibTermcap=ncurses,
  AC_CHECK_LIB(termcap, tputs, HaveLibTermcap=YES; LibTermcap=termcap,
    AC_CHECK_LIB(curses, tputs, HaveLibTermcap=YES; LibTermcap=curses,
      HaveLibTermcap=NO; LibTermcap=not-installed)))

if test $HaveLibTermcap = YES ; then
  LIBS="-l$LibTermcap $LIBS"
  AC_CHECK_LIB(readline, readline, HaveLibReadline=YES, HaveLibReadline=NO)
fi

if test $HaveLibTermcap = YES && test x"$HaveLibReadline" = xYES ; then
  AC_DEFINE(HAVE_READLINE_LIBS,1)
  LibsReadline="-lreadline -l$LibTermcap"
else
  AC_DEFINE(HAVE_READLINE_LIBS,0)
  LibsReadline=
fi
AC_SUBST(LibsReadline)

dnl ################################################################
dnl Check for libraries
dnl ################################################################

FPTOOLS_CHECK_LIB_NOWARN(dl, dlopen)
FPTOOLS_CHECK_LIB_NOWARN(dld, shl_load)
FPTOOLS_CHECK_LIB_NOWARN(m, atan)

dnl --------------------------------------------------
dnl * Miscellaneous feature tests
dnl --------------------------------------------------

dnl ** can we get alloca?
AC_FUNC_ALLOCA

dnl ** determine whether or not const works
AC_C_CONST

dnl ** determine whether ANSI-function prototypes work?
AC_C_PROTOTYPES          

dnl ** are we big endian?
AC_C_BIGENDIAN
# Allay users' general fear of warnings of any kind.
errprint((fptools configure script wizard sez: "don't worry, the above warning is harmless (to us.)")
)

dnl ** check for leading underscores in symbol names
FPTOOLS_UNDERSCORE

dnl ** how is the end of text section signalled?
FPTOOLS_END_TEXT_SECTION

dnl ** how is the end of data section signalled?
FPTOOLS_END_DATA_SECTION

dnl ** code before data?
FPTOOLS_CODE_BEFORE_DATA

AC_OUTPUT(mk/config.mk, echo timestamp > mk/stamp-h )

echo ''
echo '************************************************'
echo '*** NOW DO: gmake boot followed by gmake all'
echo '***         (where gmake == GNU make)'
echo '************************************************'
exit 0