Fixed sanitization bugs.

[deliverable/binutils-gdb.git] / gas / configure.in

dnl Process this file with autoconf to produce a configure script.
dnl
dnl And be careful when changing it!  If you must add tests with square
dnl brackets, be sure changequote invocations surround it.
dnl
dnl
dnl v2.5 needed for --bindir et al
AC_PREREQ(2.5)
AC_INIT(as.h)

AC_CANONICAL_SYSTEM

AM_INIT_AUTOMAKE(gas, 2.8.2)

AM_PROG_LIBTOOL

user_bfd_gas=
AC_ARG_ENABLE(bfd-assembler,
[  --enable-bfd-assembler  use BFD back end for writing object files],
[case "${enableval}" in
  yes) need_bfd=yes user_bfd_gas=yes ;;
  no)  user_bfd_gas=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} given for bfd-assembler option) ;;
esac])dnl
AC_ARG_ENABLE(targets,
[    targets            alternative target configurations besides the primary],
[case "${enableval}" in
  yes | "") AC_ERROR(enable-targets option must specify target names or 'all')
	    ;;
  no)	    enable_targets= ;;
  *)	    enable_targets=$enableval ;;
esac])dnl
AC_ARG_ENABLE(commonbfdlib,
[  --enable-commonbfdlib   build shared BFD/opcodes/libiberty library],
[case "${enableval}" in
  yes) commonbfdlib=true ;;
  no)  commonbfdlib=false ;;
  *)   AC_MSG_ERROR([bad value ${enableval} for BFD commonbfdlib option]) ;;
esac])dnl

# Generate a header file
AM_CONFIG_HEADER(config.h:config.in)

te_file=generic

canon_targets=""
if test -n "$enable_targets" ; then
  for t in `echo $enable_targets | sed 's/,/ /g'`; do
    result=`${CONFIG_SHELL-/bin/sh} $ac_config_sub $t 2>/dev/null`
    if test -n "$result" ; then
      canon_targets="$canon_targets $result"
#    else
#      # Permit "all", etc.  We don't support it yet though.
#      canon_targets="$canon_targets $t"
    fi
  done
  GAS_UNIQ(canon_targets)
fi

emulations=""

for this_target in $target $canon_targets ; do

changequote(,)dnl
    eval `echo $this_target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/cpu=\1 vendor=\2 os=\3/'`
changequote([,])dnl

    # check for architecture variants
    arch=
    endian=
    case ${cpu} in
      armeb)		cpu_type=arm endian=big ;;
      arm*)		cpu_type=arm endian=little ;;
      thumb*)		cpu_type=arm endian=little ;;
      hppa*)		cpu_type=hppa ;;
changequote(,)dnl
      i[456]86)		cpu_type=i386 ;;
      m680[012346]0)	cpu_type=m68k ;;
      m68008)		cpu_type=m68k ;;
      m683??)		cpu_type=m68k ;;
changequote([,])dnl
      m8*)		cpu_type=m88k ;;
      mips*el)		cpu_type=mips endian=little ;;
      mips*5900*)       cpu_type=mips endian=little ;;
      mips*)		cpu_type=mips endian=big ;;
      powerpcle*)	cpu_type=ppc endian=little ;;
      powerpc*)		cpu_type=ppc endian=big ;;
      rs6000*)		cpu_type=ppc ;;
      sparclite*)	cpu_type=sparc arch=sparclite ;;
      sparclet*)	cpu_type=sparc arch=sparclet ;;
      sparc64*)		cpu_type=sparc arch=v9 ;;
      sparc*)		cpu_type=sparc arch=sparclite ;; # ??? See tc-sparc.c.
      v850*)		cpu_type=v850 ;;
      *)		cpu_type=${cpu} ;;
    esac

    if test ${this_target} = $target ; then
      target_cpu_type=${cpu_type}
      if test x${endian} = xbig; then
	AC_DEFINE(TARGET_BYTES_BIG_ENDIAN, 1)
      elif test x${endian} = xlittle; then
	AC_DEFINE(TARGET_BYTES_BIG_ENDIAN, 0)
      fi
    elif test ${target_cpu_type} != ${cpu_type} ; then
      continue
    fi

    generic_target=${cpu_type}-$vendor-$os
    dev=no
    bfd_gas=no
    em=generic

    # assign object format
    case ${generic_target} in
      a29k-*-coff)          fmt=coff ;;
      a29k-amd-udi)         fmt=coff ;;
      a29k-amd-ebmon)       fmt=coff ;;
      a29k-nyu-sym1)        fmt=coff ;;
      a29k-*-vxworks*)      fmt=coff ;;

      alpha-*-*vms*)	    fmt=evax ;;
      alpha-*-netware*)     fmt=ecoff ;;
      alpha-*-openbsd*)     fmt=ecoff ;;
      alpha-*-osf*)         fmt=ecoff ;;
      alpha-*-linuxecoff*)  fmt=ecoff ;;
      alpha-*-linux*)       fmt=elf em=linux ;;

      arc-*-elf*)           fmt=elf bfd_gas=yes ;;

      arm-*-riscix*)	    fmt=aout em=riscix ;;
      arm-*-aout)	    fmt=aout ;;
      arm-*-coff | thumb-*-coff)           fmt=coff ;;
      arm-*-riscix*)        fmt=aout ;;
      arm-*-pe)             fmt=coff em=pe ;;

      d10v-*-*)		    fmt=elf bfd_gas=yes ;;
# start-sanitize-d30v
      d30v-*-*)		    fmt=elf bfd_gas=yes ;;
# end-sanitize-d30v

      hppa-*-*elf*)         fmt=elf em=hppa ;;
      hppa-*-lites*)        fmt=elf em=hppa ;;
      hppa-*-osf*)          fmt=som em=hppa ;;
      hppa-*-rtems*)        fmt=elf em=hppa ;;
      hppa-*-hpux*)         fmt=som em=hppa ;;
      hppa-*-bsd*)          fmt=som em=hppa ;;
      hppa-*-hiux*)         fmt=som em=hppa ;;

      h8300-*-coff)         fmt=coff ;;

      i386-ibm-aix*)        fmt=coff em=i386aix ;;
      i386-sequent-bsd*)    fmt=aout em=dynix bfd_gas=yes ;;
      i386-*-bsd*)          fmt=aout em=386bsd ;;
      i386-*-netbsd0.8)     fmt=aout em=386bsd ;;
      i386-*-netbsd*)       fmt=aout em=nbsd bfd_gas=yes;;
      i386-*-openbsd*)      fmt=aout em=nbsd bfd_gas=yes;;
      i386-*-linux*aout* | i386-*-linuxoldld)   fmt=aout em=linux ;;
      i386-*-linux*coff*)   fmt=coff em=linux ;;
      i386-*-linux*)        fmt=elf em=linux ;;
      i386-*-lynxos*)       fmt=coff em=lynx ;;
      i386-*-sysv4* | i386-*-solaris* | i386-*-elf | i386-*-freebsdelf*)
			    fmt=elf ;;
      i386-*-sco*elf*)      fmt=elf
			    if test ${this_target} = $target; then
				AC_DEFINE(SCO_ELF)
			    fi
			    ;;
      i386-*-coff | i386-*-sysv* | i386-*-sco* | i386-*-isc*)
			    fmt=coff ;;
      i386-*-vsta)          fmt=aout ;;
      i386-*-msdosdjgpp* | i386-*-go32*)
			    fmt=coff em=go32;;
      i386-*-rtems*)        fmt=coff ;;
      i386-*-gnu*)          fmt=elf ;;
      i386-*-mach*)
			    fmt=aout em=mach bfd_gas=yes ;;
      i386-*-msdos*)        fmt=aout ;;
      i386-*-moss*)	    fmt=elf ;;
      i386-*-pe)            fmt=coff em=pe ;;
      i386-*-cygwin32)      fmt=coff em=pe bfd_gas=yes ;;
      i386-*-*nt)           fmt=coff em=pe ;;
      i960-*-bout)          fmt=bout ;;
      i960-*-coff)          fmt=coff em=ic960 ;;
      i960-*-rtems*)        fmt=coff em=ic960 ;;
      i960-*-nindy*)        fmt=bout ;;
      i960-*-vxworks4*)     fmt=bout ;;
      i960-*-vxworks5.0)    fmt=bout ;;
      i960-*-vxworks5.*)    fmt=coff em=ic960 ;;
      i960-*-vxworks*)      fmt=bout ;;

      m32r-*-*)		    fmt=elf bfd_gas=yes ;;

      m68k-*-vxworks* | m68k-ericsson-ose | m68k-*-sunos*)
			    fmt=aout em=sun3 ;;
      m68k-motorola-sysv*)  fmt=coff em=delta ;;
      m68k-bull-sysv3*)     fmt=coff em=dpx2 ;;
      m68k-apollo-*)        fmt=coff em=apollo ;;
      m68k-*-sysv4*) # must be before -sysv*
			    fmt=elf em=svr4 ;;
      m68k-*-elf*)	    fmt=elf ;;
      m68k-*-coff | m68k-*-sysv* | m68k-*-rtems*)
			    fmt=coff ;;
      m68k-*-hpux*)         fmt=hp300 em=hp300 ;;
      m68k-*-linux*aout*)   fmt=aout em=linux ;;
      m68k-*-linux*)	    fmt=elf em=linux ;;
      m68k-*-lynxos*)       fmt=coff em=lynx ;;
      m68k-*-netbsd*)       fmt=aout em=nbsd bfd_gas=yes ;;
      m68k-*-openbsd*)      fmt=aout em=nbsd bfd_gas=yes ;;
      m68k-apple-aux*)      fmt=coff em=aux ;;
      m68k-*-psos*)         fmt=elf em=psos;;

      m88k-motorola-sysv3*) fmt=coff em=delt88 ;;
      m88k-*-coff*)         fmt=coff ;;

      # don't change em like *-*-bsd does
      mips-dec-netbsd*)	    fmt=elf endian=little ;;
      mips-dec-openbsd*)    fmt=elf endian=little ;;
      mips-dec-bsd*)        fmt=aout ;;
      mips-sony-bsd*)       fmt=ecoff ;;
      mips-*-bsd*)          AC_MSG_ERROR(Unknown vendor for mips-bsd configuration.) ;;
      mips-*-ultrix*)       fmt=ecoff endian=little ;;
      mips-*-osf*)          fmt=ecoff endian=little ;;
      mips-*-ecoff*)        fmt=ecoff ;;
      mips-*-ecoff*)        fmt=ecoff ;;
      mips-*-irix6*)	    fmt=elf ;;
      mips-*-irix5*)        fmt=elf ;;
      mips-*-irix*)         fmt=ecoff ;;
      mips-*-lnews*)        fmt=ecoff em=lnews ;;
      mips-*-riscos*)       fmt=ecoff ;;
      mips-*-sysv*)         fmt=ecoff ;;
      mips-*-elf* | mips-*-rtems* | mips-*-linux* | mips-*-gnu* | mips-*-openbsd*)
			    fmt=elf ;;
      mn10200-*-*)	    fmt=elf bfd_gas=yes ;;
      mn10300-*-*)	    fmt=elf bfd_gas=yes ;;
      ppc-*-pe | ppc-*-cygwin32 | ppc-*-winnt*)
		            fmt=coff em=pe ;;
      ppc-*-aix*)           fmt=coff ;;
      ppc-*-beos*)          fmt=coff ;;
      ppc-*-*bsd* | ppc-*-elf* | ppc-*-eabi* | ppc-*-sysv4*)
			    fmt=elf ;;
      ppc-*-linux*)	    fmt=elf
			    case "$endian" in
			    big)  ;;
			    *)    AC_MSG_ERROR(Linux must be configured big endian) ;;
			    esac
			    ;;
      ppc-*-solaris*)	    fmt=elf
			    if test ${this_target} = $target; then
				AC_DEFINE(TARGET_SOLARIS_COMMENT)
			    fi
			    if test x${endian} = xbig; then
				AC_MSG_ERROR(Solaris must be configured little endian)
			    fi
			    ;;
      ppc-*-rtems*)	    fmt=elf ;;
      ppc-*-macos* | ppc-*-mpw*)
			    fmt=coff em=macos ;;
      ppc-*-netware*)       fmt=elf em=ppcnw ;;

      sh-*-elf*)	    fmt=elf ;;
      sh-*-coff*)           fmt=coff ;;

      ns32k-pc532-mach* | ns32k-pc532-ux*)    fmt=aout em=pc532mach ;;
      ns32k-pc532-netbsd* | ns32k-pc532-lites*)  fmt=aout em=nbsd532 ;;
      ns32k-pc532-openbsd*) fmt=aout em=nbsd532 ;;

      sparc-*-rtems*)       fmt=aout ;;
      sparc-*-sunos4*)      fmt=aout em=sun3 ;;
      sparc-*-aout | sparc*-*-vxworks*)
			    fmt=aout em=sparcaout ;;
      sparc-*-coff)         fmt=coff ;;
      sparc-*-linux*aout*)  fmt=aout em=linux ;;
      sparc-*-linux*)	    fmt=elf em=linux ;;
      sparc-*-lynxos*)      fmt=coff em=lynx ;;
      sparc-fujitsu-none)   fmt=aout ;;
      sparc-*-elf | sparc-*-sysv4* | sparc-*-solaris*)
			    fmt=elf ;;
      sparc-*-netbsd*)      fmt=aout em=nbsd bfd_gas=yes ;;
      sparc-*-openbsd*)     fmt=aout em=nbsd bfd_gas=yes ;;

# start-sanitize-tic80
      tic80-*-*)	    fmt=coff ;;
# end-sanitize-tic80
      v850-*-*)		    fmt=elf bfd_gas=yes ;;

# start-sanitize-v850e
      v850e-*-*)	    fmt=elf bfd_gas=yes ;;
# end-sanitize-v850e
# start-sanitize-v850eq
      v850eq-*-*)	    fmt=elf bfd_gas=yes ;;
# end-sanitize-v850eq
      vax-*-bsd* | vax-*-ultrix*)
			    fmt=aout ;;
      vax-*-vms)            fmt=vms ;;

      z8k-*-coff | z8k-*-sim)
			    fmt=coff ;;

      w65-*-*)              fmt=coff ;;

      *-*-aout | *-*-scout)
			    fmt=aout ;;
      *-*-nindy*)
			    fmt=bout ;;
      *-*-bsd*)
			    fmt=aout em=sun3 ;;
      *-*-generic)          fmt=generic ;;
      *-*-xray | *-*-hms)   fmt=coff ;;
      *-*-sim)              fmt=coff ;;
      *-*-elf | *-*-sysv4* | *-*-solaris*)
			    AC_MSG_WARN(GAS support for ${generic_target} is incomplete.)
			    fmt=elf dev=yes ;;
      *-*-vxworks)          fmt=aout ;;
      *-*-netware)          fmt=elf ;;
    esac

    case ${cpu_type}-${fmt} in
      alpha-*)	bfd_gas=yes ;;
      arm-*)	bfd_gas=yes ;;
    # not yet
    # i386-aout)	bfd_gas=preferred ;;
      mips-*)	bfd_gas=yes ;;
      ns32k-*)	bfd_gas=yes ;;
      ppc-*)	bfd_gas=yes ;;
      sparc-*)	bfd_gas=yes ;;
      *-elf)	bfd_gas=yes ;;
      *-ecoff)	bfd_gas=yes ;;
      *-som)	bfd_gas=yes ;;
      *)		;;
    esac

# Other random stuff.

    # do we need the opcodes library?
    case ${cpu_type} in
      vax | i386)
	;;
      *)
	need_opcodes=yes
	if test "${shared_opcodes}" = "true"; then
	  # A shared libopcodes must be linked against libbfd.
	  need_bfd=yes
	fi
	;;
    esac

    case ${cpu_type} in
      m32r)
	case ${extra_objects} in
	*cgen.o*) ;;
	*) extra_objects="$extra_objects cgen.o"
	   AC_DEFINE(USING_CGEN)
	   ;;
	esac
	;;

      m68k)
	case ${extra_objects} in
	*m68k-parse.o*) ;;
	*) extra_objects="$extra_objects m68k-parse.o" ;;
	esac
	;;

      mips)
	echo ${extra_objects} | grep -s "itbl-parse.o" 
	if test $? -ne 0 ; then
	  extra_objects="$extra_objects itbl-parse.o"
	fi

	echo ${extra_objects} | grep -s "itbl-lex.o" 
	if test $? -ne 0 ; then
	  extra_objects="$extra_objects itbl-lex.o"
	fi

	echo ${extra_objects} | grep -s "itbl-ops.o" 
	if test $? -ne 0 ; then
	  extra_objects="$extra_objects itbl-ops.o"
	fi
	;;

      sparc)
	AC_DEFINE_UNQUOTED(DEFAULT_ARCH, "${arch}")
	;;

      *)
	;;
    esac

# See if we really can support this configuration with the emulation code.

    if test $this_target = $target ; then
      primary_bfd_gas=$bfd_gas
      obj_format=$fmt
      te_file=$em

      if test $bfd_gas = no ; then
	# Can't support other configurations this way.
	break
      fi
    elif test $bfd_gas = no ; then
      # Can't support this configuration.
      break
    fi

# From target name and format, produce a list of supported emulations.

    case ${generic_target}-${fmt} in
      mips-*-irix5*-*)	emulation="mipsbelf mipslelf mipself mipsbecoff mipslecoff mipsecoff" ;;
      mips-*-linux*-*)	case "$endian" in
			big)	emulation="mipsbelf mipslelf mipself mipsbecoff mipslecoff mipsecoff" ;;
			*)	emulation="mipslelf mipsbelf mipself mipslecoff mipsbecoff mipsecoff" ;;
			esac ;;
      mips-*-lnews*-ecoff) ;;
      mips-*-*-ecoff)	case "$endian" in
			big)	emulation="mipsbecoff mipslecoff mipsecoff" ;;
			*)	emulation="mipslecoff mipsbecoff mipsecoff" ;;
			esac ;;
      mips-*-*-elf)	case "$endian" in
			big)	emulation="mipsbelf mipslelf mipself" ;;
			*)	emulation="mipslelf mipsbelf mipself" ;;
      # Uncommenting the next line will turn on support for i386 COFF
      # in any i386 ELF configuration.  This probably doesn't work
      # correctly.
      # i386-*-*-elf)	emulation="i386coff i386elf" ;;
			esac ;;
    esac

    emulations="$emulations $emulation"

done

# Assign floating point type.  Most processors with FP support
# IEEE FP.  On those that don't support FP at all, usually IEEE
# is emulated.
case ${target_cpu} in
  vax | tahoe )	atof=${target_cpu} ;;
  *)		atof=ieee ;;
esac

case "${obj_format}" in
  "") AC_MSG_ERROR(GAS does not know what format to use for target ${target}) ;;
esac

dnl
dnl Make sure the desired support files exist.
dnl

if test ! -r ${srcdir}/config/tc-${target_cpu_type}.c; then
  AC_MSG_ERROR(GAS does not support target CPU ${target_cpu_type})
fi

if test ! -r ${srcdir}/config/obj-${obj_format}.c; then
  AC_MSG_ERROR(GAS does not have support for object file format ${obj_format})
fi

case ${user_bfd_gas}-${primary_bfd_gas} in
  yes-yes | no-no)
    # We didn't override user's choice.
    ;;
  no-yes)
    AC_MSG_WARN(Use of BFD is required for ${target}; overriding config options.)
    ;;
  no-preferred)
    primary_bfd_gas=no
    ;;
  *-preferred)
    primary_bfd_gas=yes
    ;;
  yes-*)
    primary_bfd_gas=yes
    ;;
  -*)
    # User specified nothing.
    ;;
esac

# Some COFF configurations want these random other flags set.
case ${obj_format} in
  coff)
    case ${target_cpu_type} in
      i386) AC_DEFINE(I386COFF) ;;
      m68k) AC_DEFINE(M68KCOFF) ;;
      m88k) AC_DEFINE(M88KCOFF) ;;
    esac
    ;;
esac

# Getting this done right is going to be a bitch.  Each configuration specified
# with --enable-targets=... should be checked for environment, format, cpu, and
# bfd_gas setting.
#
# For each configuration, the necessary object file support code must be linked
# in.  This might be only one, it might be up to four.  The necessary emulation
# code needs to be provided, too.
#
# And then there's "--enable-targets=all"....
#
# For now, just always do it for MIPS ELF or ECOFF configurations.  Sigh.

formats="${obj_format}"
emfiles=""
EMULATIONS=""
GAS_UNIQ(emulations)
for em in . $emulations ; do
  case $em in
    .)	continue ;;
    mipsbelf | mipslelf)
	fmt=elf   file=mipself ;;
    mipsbecoff | mipslecoff)
	fmt=ecoff file=mipsecoff ;;
    i386coff)
	fmt=coff  file=i386coff ;;
    i386elf)
	fmt=elf   file=i386elf ;;
  esac
  formats="$formats $fmt"
  emfiles="$emfiles e-$file.o"
  EMULATIONS="$EMULATIONS &$em,"
done
GAS_UNIQ(formats)
GAS_UNIQ(emfiles)
if test `set . $formats ; shift ; echo $#` -gt 1 ; then
  for fmt in $formats ; do
    case $fmt in
      aout)	AC_DEFINE(OBJ_MAYBE_AOUT)    ;;
      bout)	AC_DEFINE(OBJ_MAYBE_BOUT)    ;;
      coff)	AC_DEFINE(OBJ_MAYBE_COFF)    ;;
      ecoff)	AC_DEFINE(OBJ_MAYBE_ECOFF)   ;;
      elf)	AC_DEFINE(OBJ_MAYBE_ELF)     ;;
      generic)	AC_DEFINE(OBJ_MAYBE_GENERIC) ;;
      hp300)	AC_DEFINE(OBJ_MAYBE_HP300)   ;;
      ieee)	AC_DEFINE(OBJ_MAYBE_IEEE)    ;;
      som)	AC_DEFINE(OBJ_MAYBE_SOM)     ;;
      vms)	AC_DEFINE(OBJ_MAYBE_VMS)     ;;
    esac
    extra_objects="$extra_objects obj-$fmt.o"
  done
  obj_format=multi
fi
if test `set . $emfiles ; shift ; echo $#` -gt 0 ; then
  te_file=multi
  extra_objects="$extra_objects $emfiles"
  DEFAULT_EMULATION=`set . $emulations ; echo $2`
  AC_DEFINE(USE_EMULATIONS)
fi
AC_SUBST(extra_objects)
AC_DEFINE_UNQUOTED(EMULATIONS, $EMULATIONS)
AC_DEFINE_UNQUOTED(DEFAULT_EMULATION, "$DEFAULT_EMULATION")

case ${primary_bfd_gas}-${target_cpu_type}-${obj_format} in
  yes-*-coff)	need_bfd=yes ;;
  no-*-coff)	need_bfd=yes
		AC_DEFINE(MANY_SEGMENTS) ;;
esac

reject_dev_configs=yes

case ${reject_dev_configs}-${dev} in
  yes-yes) # Oops.
    AC_MSG_ERROR(GAS does not support the ${generic_target} configuration.)
    ;;
esac

AC_SUBST(target_cpu_type)
AC_SUBST(obj_format)
AC_SUBST(te_file)
AC_SUBST(atof)
dnl AC_SUBST(emulation)

case "${primary_bfd_gas}" in
  yes)	AC_DEFINE(BFD_ASSEMBLER)
	need_bfd=yes ;;
esac

# do we need the opcodes library?
case "${need_opcodes}" in
yes)
  OPCODES_LIB=../opcodes/libopcodes.la
  ;;
esac

case "${need_bfd}" in
yes)
  BFDLIB=../bfd/libbfd.la
  ALL_OBJ_DEPS="$ALL_OBJ_DEPS ../bfd/bfd.h"
  ;;
esac

AC_SUBST(BFDLIB)
AC_SUBST(OPCODES_LIB)

AC_SUBST(ALL_OBJ_DEPS)

AC_DEFINE_UNQUOTED(TARGET_ALIAS,	"${target_alias}")
AC_DEFINE_UNQUOTED(TARGET_CANONICAL,	"${target}")
AC_DEFINE_UNQUOTED(TARGET_CPU,		"${target_cpu}")
AC_DEFINE_UNQUOTED(TARGET_VENDOR,	"${target_vendor}")
AC_DEFINE_UNQUOTED(TARGET_OS,		"${target_os}")

AC_PROG_CC
AC_PROG_INSTALL

AC_PROG_YACC
AC_PROG_LEX
AC_DECL_YYTEXT

AM_MAINTAINER_MODE
AM_CYGWIN32
AM_EXEEXT

AC_CHECK_HEADERS(string.h stdlib.h memory.h strings.h unistd.h stdarg.h varargs.h errno.h sys/types.h)

# Put this here so that autoconf's "cross-compiling" message doesn't confuse
# people who are not cross-compiling but are compiling cross-assemblers.
AC_MSG_CHECKING(whether compiling a cross-assembler)
if test "${host}" = "${target}"; then
  cross_gas=no
else
  cross_gas=yes
  AC_DEFINE(CROSS_COMPILE)
fi
AC_MSG_RESULT($cross_gas)

dnl ansidecl.h will deal with const
dnl AC_CONST
AC_FUNC_ALLOCA
AC_C_INLINE

# VMS doesn't have unlink.
AC_CHECK_FUNCS(unlink remove, break)

# Some systems don't have sbrk().
AC_CHECK_FUNCS(sbrk)

# Some non-ANSI preprocessors botch requoting inside strings.  That's bad
# enough, but on some of those systems, the assert macro relies on requoting
# working properly!
GAS_WORKING_ASSERT

# On some systems, the system header files may not declare malloc, realloc,
# and free.  There are places where gas needs these functions to have been
# declared -- such as when taking their addresses.
gas_test_headers="
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
"
GAS_CHECK_DECL_NEEDED(strstr, f, char *(*f)(), $gas_test_headers)
GAS_CHECK_DECL_NEEDED(malloc, f, char *(*f)(), $gas_test_headers)
GAS_CHECK_DECL_NEEDED(free, f, void (*f)(), $gas_test_headers)
GAS_CHECK_DECL_NEEDED(sbrk, f, char *(*f)(), $gas_test_headers)

# Does errno.h declare errno, or do we have to add a separate declaration
# for it?
GAS_CHECK_DECL_NEEDED(errno, f, int f, [
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
])

dnl This must come last.

dnl We used to make symlinks to files in the source directory, but now
dnl we just use the right name for .c files, and create .h files in
dnl the build directory which include the right .h file.  Make sure
dnl the old symlinks don't exist, so that a reconfigure in an existing
dnl directory behaves reasonably.

AC_OUTPUT(Makefile doc/Makefile .gdbinit:gdbinit.in,
[rm -f targ-cpu.c targ-cpu.h obj-format.h obj-format.c targ-env.h atof-targ.c itbl-cpu.h
 echo '#include "tc-'"${target_cpu_type}"'.h"' > targ-cpu.h
 echo '#include "obj-'"${obj_format}"'.h"' > obj-format.h
 echo '#include "te-'"${te_file}"'.h"' > targ-env.h
 echo '#include "itbl-'"${target_cpu_type}"'.h"' > itbl-cpu.h
 case ${target_cpu_type} in
 m32r) echo '#include "opcodes/'"${target_cpu_type}"'-opc.h"' > cgen-opc.h ;;
 esac],
[target_cpu_type=${target_cpu_type}
 obj_format=${obj_format}
 te_file=${te_file}])