1998-09-24 Jason Molenda (jsm@bugshack.cygnus.com)

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

dnl Autoconf configure script for GDB, the GNU debugger.
dnl Copyright 1995, 1996 Free Software Foundation, Inc.
dnl
dnl This file is part of GDB.
dnl 
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl 
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl 
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software
dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.5)dnl
AC_INIT(main.c)
AC_CONFIG_HEADER(config.h:config.in)

AC_PROG_CC
AC_AIX
AC_MINIX
AC_ISC_POSIX

DLLTOOL=${DLLTOOL-dlltool}
AC_SUBST(DLLTOOL)

AC_CONFIG_AUX_DIR(`cd $srcdir;pwd`/..)
AC_CANONICAL_SYSTEM

dnl gdb doesn't use gettext, but bfd does.  We call this to ensure we
dnl link with the correct libraries.
ALL_LINGUAS=
CY_GNU_GETTEXT

dnl List of object files added by configure.

CONFIG_OBS=
CONFIG_DEPS=
CONFIG_SRCS=

configdirs="doc testsuite"

dnl
changequote(,)dnl

. ${srcdir}/configure.host

. ${srcdir}/configure.tgt

dnl
changequote([,])dnl

AC_PROG_INSTALL
AC_CHECK_TOOL(AR, ar)
AC_CHECK_TOOL(RANLIB, ranlib, :)
AC_PROG_YACC
AC_PROG_AWK

AC_ARG_PROGRAM

AC_TYPE_SIGNAL

AC_HEADER_STDC
AC_CHECK_HEADERS(ctype.h curses.h endian.h libintl.h limits.h link.h \
                 memory.h objlist.h ptrace.h sgtty.h stddef.h stdlib.h \
                 string.h strings.h sys/procfs.h sys/ptrace.h sys/reg.h \
                 term.h termio.h termios.h unistd.h wait.h sys/wait.h \
                 wchar.h wctype.h)

AC_HEADER_STAT

AC_C_CONST

AC_CHECK_FUNCS(setpgid sbrk select poll sigaction isascii bzero bcopy memcpy btowc)
AC_FUNC_ALLOCA

# If we are configured native on GNU/Linux, work around problems with sys/procfs.h
if test "${target}" = "${host}"; then
  case "${host}" in
  i[[3456]]86-*-linux*)
	AC_DEFINE(START_INFERIOR_TRAPS_EXPECTED,2)
	AC_DEFINE(sys_quotactl)
	;;
  esac
fi

AC_MSG_CHECKING([for gregset_t type])
AC_CACHE_VAL(gdb_cv_have_gregset_t,
[AC_TRY_LINK([#include <sys/procfs.h>],[gregset_t *gregsetp = 0],
gdb_cv_have_gregset_t=yes, gdb_cv_have_gregset_t=no)])
AC_MSG_RESULT($gdb_cv_have_gregset_t)
if test $gdb_cv_have_gregset_t = yes; then
  AC_DEFINE(HAVE_GREGSET_T)
fi

AC_MSG_CHECKING([for fpregset_t type])
AC_CACHE_VAL(gdb_cv_have_fpregset_t,
[AC_TRY_LINK([#include <sys/procfs.h>],[fpregset_t *fpregsetp = 0],
gdb_cv_have_fpregset_t=yes, gdb_cv_have_fpregset_t=no)])
AC_MSG_RESULT($gdb_cv_have_fpregset_t)
if test $gdb_cv_have_fpregset_t = yes; then
  AC_DEFINE(HAVE_FPREGSET_T)
fi

dnl See if host has libm.  This is usually needed by simulators.
AC_CHECK_LIB(m, main)

dnl See if compiler supports "long long" type.

AC_MSG_CHECKING(for long long support in compiler)
AC_CACHE_VAL(gdb_cv_c_long_long,
[AC_TRY_COMPILE(, [
  extern long long foo;
  switch (foo & 2) { case 0: return 1; }
],
gdb_cv_c_long_long=yes, gdb_cv_c_long_long=no)])
AC_MSG_RESULT($gdb_cv_c_long_long)
if test $gdb_cv_c_long_long = yes; then
  AC_DEFINE(CC_HAS_LONG_LONG)
fi

dnl See if the compiler and runtime support printing long long

AC_MSG_CHECKING(for long long support in printf)
AC_CACHE_VAL(gdb_cv_printf_has_long_long,
[AC_TRY_RUN([
int main () {
  char buf[32];
  long long l = 0;
  l = (l << 16) + 0x0123;
  l = (l << 16) + 0x4567;
  l = (l << 16) + 0x89ab;
  l = (l << 16) + 0xcdef;
  sprintf (buf, "0x%016llx", l);
  return (strcmp ("0x0123456789abcdef", buf));
}],
gdb_cv_printf_has_long_long=yes,
gdb_cv_printf_has_long_long=no,
gdb_cv_printf_has_long_long=no)])
if test $gdb_cv_printf_has_long_long = yes; then
  AC_DEFINE(PRINTF_HAS_LONG_LONG)
fi
AC_MSG_RESULT($gdb_cv_printf_has_long_long)

dnl See if compiler supports "long double" type.  Can't use AC_C_LONG_DOUBLE
dnl because autoconf complains about cross-compilation issues.  However, this
dnl code uses the same variables as the macro for compatibility.

AC_MSG_CHECKING(for long double support in compiler)
AC_CACHE_VAL(ac_cv_c_long_double,
[AC_TRY_COMPILE(, [long double foo;],
ac_cv_c_long_double=yes, ac_cv_c_long_double=no)])
AC_MSG_RESULT($ac_cv_c_long_double)
if test $ac_cv_c_long_double = yes; then
  AC_DEFINE(HAVE_LONG_DOUBLE)
fi

dnl See if the compiler and runtime support printing long doubles

AC_MSG_CHECKING(for long double support in printf)
AC_CACHE_VAL(gdb_cv_printf_has_long_double,
[AC_TRY_RUN([
int main () {
  char buf[16];
  long double f = 3.141592653;
  sprintf (buf, "%Lg", f);
  return (strncmp ("3.14159", buf, 7));
}],
gdb_cv_printf_has_long_double=yes,
gdb_cv_printf_has_long_double=no,
gdb_cv_printf_has_long_double=no)])
if test $gdb_cv_printf_has_long_double = yes; then
  AC_DEFINE(PRINTF_HAS_LONG_DOUBLE)
fi
AC_MSG_RESULT($gdb_cv_printf_has_long_double)

dnl See if the compiler and runtime support scanning long doubles

AC_MSG_CHECKING(for long double support in scanf)
AC_CACHE_VAL(gdb_cv_scanf_has_long_double,
[AC_TRY_RUN([
int main () {
  char *buf = "3.141592653";
  long double f = 0;
  sscanf (buf, "%Lg", &f);
  return !(f > 3.14159 && f < 3.14160);
}],
gdb_cv_scanf_has_long_double=yes,
gdb_cv_scanf_has_long_double=no,
gdb_cv_scanf_has_long_double=no)])
if test $gdb_cv_scanf_has_long_double = yes; then
  AC_DEFINE(SCANF_HAS_LONG_DOUBLE)
fi
AC_MSG_RESULT($gdb_cv_scanf_has_long_double)

AC_FUNC_MMAP

BFD_NEED_DECLARATION(malloc)
BFD_NEED_DECLARATION(realloc)
BFD_NEED_DECLARATION(free)

BFD_NEED_DECLARATION(strerror)

dnl See if thread_db library is around for Solaris thread debugging.  Note that
dnl we must explicitly test for version 1 of the library because version 0
dnl (present on Solaris 2.4 or earlier) doesn't have the same API.

dnl Note that we only want this if we are both native (host == target), and
dnl not doing a canadian cross build (build == host).

if test ${build} = ${host} -a ${host} = ${target} ; then
   case ${host_os} in
   hpux*)
      AC_MSG_CHECKING(for HPUX/OSF thread support)
      if test -f /usr/include/dce/cma_config.h ; then
         if test "$GCC" = "yes" ; then
            AC_MSG_RESULT(yes)
            AC_DEFINE(HAVE_HPUX_THREAD_SUPPORT)
            CONFIG_OBS="${CONFIG_OJS} hpux-thread.o"
            CONFIG_SRCS="${CONFIG_SRCS} hpux-thread.c"
         else
            AC_MSG_RESULT(no (suppressed because you are not using GCC))
         fi
      else
         AC_MSG_RESULT(no)
      fi
      ;;
   solaris*)
      AC_MSG_CHECKING(for Solaris thread debugging library)
      if test -f /usr/lib/libthread_db.so.1 ; then
         AC_MSG_RESULT(yes)
         AC_DEFINE(HAVE_THREAD_DB_LIB)
         CONFIG_OBS="${CONFIG_OBS} sol-thread.o"
         CONFIG_SRCS="${CONFIG_SRCS} sol-thread.c"
         AC_CHECK_LIB(dl, dlopen)
         if test "$GCC" = "yes" ; then
            # The GNU linker requires the -export-dynamic option to make
            # all symbols visible in the dynamic symbol table.
            hold_ldflags=$LDFLAGS
            AC_MSG_CHECKING(for the ld -export-dynamic flag)
            LDFLAGS="${LDFLAGS} -Wl,-export-dynamic"
            AC_TRY_LINK(, [int i;], found=yes, found=no)
            LDFLAGS=$hold_ldflags
            AC_MSG_RESULT($found)
            if test $found = yes; then
               CONFIG_LDFLAGS="${CONFIG_LDFLAGS} -Wl,-export-dynamic"
            fi
         fi
      else
         AC_MSG_RESULT(no)
      fi
      ;;
   esac
   AC_SUBST(CONFIG_LDFLAGS)
fi

dnl Handle optional features that can be enabled.
ENABLE_CFLAGS=

AC_ARG_ENABLE(netrom,
[  --enable-netrom ],
[case "${enableval}" in
yes)	enable_netrom=yes ;;
no)	enable_netrom=no ;;
*)	AC_MSG_ERROR(bad value ${enableval} given for netrom option) ;;
esac])

if test "${enable_netrom}" = "yes"; then
	CONFIG_OBS="${CONFIG_OBS} remote-nrom.o" 
        CONFIG_SRCS="${CONFIG_SRCS} remote-nrom.c"
fi

AC_ARG_ENABLE(warnings,
[  --enable-warnings       Enable compiler warnings if gcc is used],
[case "${enableval}" in
yes)	enable_warnings=yes ;;
no)	enable_warnings=no ;;
*)	AC_MSG_ERROR(bad value ${enableval} given for warnings options) ;;
esac])

if test "x$enable_warnings" = xyes -a "x$GCC" = xyes
then
   WARN_CFLAGS="-Wall -Wstrict-prototypes"
else
   WARN_CFLAGS=""
fi
AC_SUBST(WARN_CFLAGS)

MMALLOC_CFLAGS=
MMALLOC=
AC_SUBST(MMALLOC_CFLAGS)
AC_SUBST(MMALLOC)

AC_ARG_WITH(mmalloc,
[  --with-mmalloc          Use memory mapped malloc package],
[case "${withval}" in
  yes)  want_mmalloc=true ;;
  no)   want_mmalloc=false;;
  *)    AC_MSG_ERROR(bad value ${withval} for GDB with-mmalloc option) ;;
esac],[want_mmalloc=false])dnl

if test x$want_mmalloc = xtrue; then
   AC_DEFINE(USE_MMALLOC)
   AC_DEFINE(MMCHECK_FORCE)
   MMALLOC_CFLAGS="-I$srcdir/../mmalloc"
   MMALLOC='../mmalloc/libmmalloc.a'
fi

# start-sanitize-gdbtk
# start-sanitize-ide
ENABLE_IDE=
AC_ARG_ENABLE(ide, [  --enable-ide            Enable IDE support])
if test "$enable_ide" = yes; then
   enable_ide=yes
   ENABLE_IDE=1
else
   enable_ide=no
fi
AC_SUBST(ENABLE_IDE)

AC_ARG_WITH(foundry-libs,
[  --with-foundry-libs=DIR Use the Foundry SDK in DIR],
[FOUNDRY_LIB_BASE=${withval}])
AC_SUBST(FOUNDRY_LIB_BASE)

#
# This is the Foundry SDK
#
# These variables are used to determine where the Foundry libs and
# header files are located.
#
if test "$FOUNDRY_LIB_BASE" != ""; then
    LIBGUI="${FOUNDRY_LIB_BASE}/lib/libgui.a"
    GUI_CFLAGS_X="-I${FOUNDRY_LIB_BASE}/include"
    if test x$enable_ide = xyes; then
        IDE_CFLAGS_X="-I${FOUNDRY_LIB_BASE}/include -DIDE"
	IDE_X="-L${FOUNDRY_LIB_BASE}/lib -lilu-Tk -lilu-c -lilu"
    else
        IDE_CFLAGS_X="-I${FOUNDRY_LIB_BASE}/include"
    fi
    LIBIDETCL="${FOUNDRY_LIB_BASE}/lib/libidetcl.a"
    LIBIDE="${FOUNDRY_LIB_BASE}/lib/libide.a"
    IDE_DEPS="${FOUNDRY_LIB_BASE}/lib/libilu-Tk.a ${FOUNDRY_LIB_BASE}/lib/libilu-c.a ${FOUNDRY_LIB_BASE}/lib/libilu.a"
else
    LIBGUI="../libgui/src/libgui.a"
    GUI_CFLAGS_X="-I${srcdir}/../libgui/src"
    if test x$enable_ide = xyes; then
        IDE_CFLAGS_X="-I${srcdir}/../libidetcl/src -I${srcdir}/../libide/src -DIDE -I${srcdir}/../ilu/runtime/mainloop"
	IDE_X="-L../ilu/runtime/mainloop -lilu-Tk -L../ilu/runtime/c -lilu-c -L../ilu/runtime/kernel -lilu"
    else
        IDE_CFLAGS_X="-I${srcdir}/../libidetcl/src -I${srcdir}/../libide/src"
    fi
    LIBIDETCL="../libidetcl/src/libidetcl.a"
    LIBIDE="../libide/src/libide.a"
    IDE_DEPS="../ilu/runtime/mainloop/libilu-Tk.a ../ilu/runtime/c/libilu-c.a ../ilu/runtime/kernel/libilu.a"
fi
AC_SUBST(LIBGUI)
AC_SUBST(GUI_CFLAGS_X)
AC_SUBST(IDE_CFLAGS_X)
AC_SUBST(IDE_X)
AC_SUBST(LIBIDETCL)
AC_SUBST(LIBIDE)
AC_SUBST(IDE_DEPS)
# end-sanitize-ide

ENABLE_GDBTK=

AC_ARG_ENABLE(gdbtk,
[  --enable-gdbtk          Enable GDBTK GUI front end],
[case "${enableval}" in
    yes)
	case "$host" in
	*go32*)
	    AC_MSG_WARN([GDB does not support GDBtk on host ${host}.  GDBtk will be disabled.])
	    enable_gdbtk=no ;;
	*windows*)
	    AC_MSG_WARN([GDB does not support GDBtk on host ${host}.  GDBtk will be disabled.])
	    enable_gdbtk=no ;;
	*)
	    enable_gdbtk=yes ;;
	esac ;;
    no)
	enable_gdbtk=no  ;;
    *)
	AC_MSG_ERROR(bad value ${enableval} given for gdbtk option) ;;
esac],
[
# Default is on for everything but go32 and cygwin32
case "$host" in
    *go32* | *windows*)
	;;
    *)
	enable_gdbtk=yes ;;
    esac
])

# In the cygwin32 environment, we need some additional flags.
AC_CACHE_CHECK([for cygwin32], gdb_cv_os_cygwin32,
[AC_EGREP_CPP(lose, [
#ifdef __CYGWIN32__
lose
#endif],[gdb_cv_os_cygwin32=yes],[gdb_cv_os_cygwin32=no])])

WIN32LIBS=
WIN32LDAPP=
AC_SUBST(WIN32LIBS)
AC_SUBST(WIN32LDAPP)

WINDRES=${WINDRES-windres}
AC_SUBST(WINDRES)

if test x$gdb_cv_os_cygwin32 = xyes; then
    if test x$enable_ide = xyes; then
	WIN32LIBS="-ladvapi32"
    fi
fi

configdir="unix"

GDBTKLIBS=
if test "${enable_gdbtk}" = "yes"; then

    CY_AC_PATH_TCLCONFIG
    if test -z "${no_tcl}"; then
	CY_AC_LOAD_TCLCONFIG
	CY_AC_PATH_TKCONFIG

	# If $no_tk is nonempty, then we can't do Tk, and there is no
	# point to doing Tcl.
	if test -z "${no_tk}"; then
	   CY_AC_LOAD_TKCONFIG
	   CY_AC_PATH_TCLH
	   CY_AC_PATH_TKH
	   CY_AC_PATH_ITCLH
	   CY_AC_PATH_TIX

	   # now look for tix library stuff
	   TIXVERSION=4.1.8.0
	   . ${ac_cv_c_tclconfig}/tclConfig.sh
	   case "${host}" in
	   *-*-cygwin32*)
		tixdir=../tix/win/tcl8.0
		;;
	   *)
		tixdir=../tix/unix/tk8.0
		;;
	   esac 
	   if test "${TCL_SHARED_BUILD}" = "1"; then
		TIX_LIB_EXT="${TCL_SHLIB_SUFFIX}"

	        # Can't win them all: SunOS 4 (others?) appends a version
                # number after the ".so"
	        case "${host}" in
	        *-*-sunos4*)
	            TIX_LIB_EXT="${TIX_LIB_EXT}.1.0" ;;
                esac
	   
	   else
		TIX_LIB_EXT=".a"
	   fi

	   if test "${TCL_LIB_VERSIONS_OK}" = "ok"; then
		TIXLIB="-L${tixdir} -ltix${TIXVERSION}"
		TIX_DEPS="${tixdir}/libtix${TIXVERSION}${TIX_LIB_EXT}"
	   else
		TIXLIB="-L${tixdir} -ltix`echo ${TIXVERSION} | tr -d .`"
		TIX_DEPS="${tixdir}/libtix`echo ${TIXVERSION} | tr -d .`${TIX_LIB_EXT}"
	   fi

	   ENABLE_GDBTK=1
           ENABLE_CFLAGS="${ENABLE_CFLAGS} -DGDBTK"

	   # Include some libraries that Tcl and Tk want.
	   if test "${enable_ide}" = "yes"; then	
	      TCL_LIBS='$(LIBIDETCL) $(LIBIDE) $(LIBGUI) $(IDE) $(ITCL) $(TIX) $(TK) $(TCL) $(X11_LDFLAGS) $(X11_LIBS)'
	      CONFIG_DEPS='$(LIBIDETCL) $(LIBIDE) $(LIBGUI) $(IDE_DEPS) $(ITCL_DEPS) $(TIX_DEPS) $(TK_DEPS) $(TCL_DEPS)'
	   else
	      TCL_LIBS='$(LIBGUI) $(ITCL) $(TIX) $(TK) $(TCL) $(X11_LDFLAGS) $(X11_LIBS)'
	      CONFIG_DEPS='$(LIBGUI) $(ITCL_DEPS) $(TIX_DEPS) $(TK_DEPS) $(TCL_DEPS)'
	   fi
	   # Yes, the ordering seems wrong here.  But it isn't.
	   # TK_LIBS is the list of libraries that need to be linked
	   # after Tcl/Tk.  Note that this isn't put into LIBS.  If it
	   # were in LIBS then any link tests after this point would
	   # try to include things like `$(LIBGUI)', which wouldn't work.
	   GDBTKLIBS="${TCL_LIBS} ${TK_LIBS}"
	   CONFIG_OBS="${CONFIG_OBS} gdbtk.o gdbtk-cmds.o gdbtk-hooks.o"

	   if test x$gdb_cv_os_cygwin32 = xyes; then
	      WIN32LIBS="${WIN32LIBS} -lshell32 -lgdi32 -lcomdlg32 -ladvapi32 -luser32"
	      WIN32LDAPP="-Wl,--subsystem,console"
	      CONFIG_OBS="${CONFIG_OBS} gdbres.o"
	   fi
	fi
    fi
fi

AC_SUBST(ENABLE_GDBTK)
AC_SUBST(X_CFLAGS)
AC_SUBST(X_LDFLAGS)
AC_SUBST(X_LIBS)
AC_SUBST(TIXLIB)
AC_SUBST(TIX_DEPS)
AC_SUBST(GDBTKLIBS)
# end-sanitize-gdbtk

AC_PATH_X
# start-sanitize-sky
# Enable GPU2 library for MIPS simulator
AC_ARG_WITH(sim-gpu2,
[  --with-sim-gpu2=DIR     Use GPU2 library under given DIR],
[case "${target}" in
  mips*-sky-*)
    if test -d "${withval}"
    then
      LIBS="${LIBS} -L${withval}/lib -lgpu2 -L${x_libraries} -lX11 -lXext"
    else
      AC_MSG_WARN([Directory ${withval} does not exist.])
    fi ;;
  *)  AC_MSG_WARN([--with-sim-gpu2 option invalid for target ${target}])
esac])dnl

# Enable target accurate FP library
AC_ARG_WITH(sim-funit,
[  --with-sim-funit=DIR    Use target FP lib under given DIR],
[case "${target}" in
  mips*-sky-*)
    if test -d "${withval}"
    then
      LIBS="${LIBS} -L${withval}/lib -lfunit"
    else
      AC_MSG_WARN([Directory ${withval} does not exist.])
    fi ;;
  *)  AC_MSG_WARN([--with-sim-funit option invalid for target ${target}])
esac])dnl
# end-sanitize-sky

dnl Solaris puts wctype in /usr/lib/libw.a
AC_CHECK_LIB(w, wctype, [LIBS="$LIBS -lw"])

AC_SUBST(ENABLE_CFLAGS)

AC_SUBST(CONFIG_OBS)
AC_SUBST(CONFIG_DEPS)
AC_SUBST(CONFIG_SRCS)

# Begin stuff to support --enable-shared
AC_ARG_ENABLE(shared,
[  --enable-shared         Use shared libraries],
[case "${enableval}" in
  yes) shared=true ;;
  no)  shared=false ;;
  *) shared=true ;;
esac])dnl

HLDFLAGS=
HLDENV=
# If we have shared libraries, try to set rpath reasonably.
if test "${shared}" = "true"; then
  case "${host}" in
  *-*-hpux*)
    HLDFLAGS='-Wl,+s,+b,$(libdir)'
    ;;
  *-*-irix5* | *-*-irix6*)
    HLDFLAGS='-Wl,-rpath,$(libdir)'
    ;;
  *-*-linux*aout*)
    ;;
  *-*-linux* | *-pc-linux-gnu)
    HLDFLAGS='-Wl,-rpath,$(libdir)'
    ;;
  *-*-solaris*)
    HLDFLAGS='-R $(libdir)'
    ;;
  *-*-sysv4*)
    HLDENV='if test -z "$${LD_RUN_PATH}"; then LD_RUN_PATH=$(libdir); else LD_RUN_PATH=$${LD_RUN_PATH}:$(libdir); fi; export LD_RUN_PATH;'
    ;;
  esac
fi

# On SunOS, if the linker supports the -rpath option, use it to
# prevent ../bfd and ../opcodes from being included in the run time
# search path.
case "${host}" in
  *-*-sunos*)
    echo 'main () { }' > conftest.c
    ${CC} -o conftest -Wl,-rpath= conftest.c >/dev/null 2>conftest.t
    if grep 'unrecognized' conftest.t >/dev/null 2>&1; then
      :
    elif grep 'No such file' conftest.t >/dev/null 2>&1; then
      :
    elif grep 'do not mix' conftest.t >/dev/null 2>&1; then
      :
    elif grep 'some text already loaded' conftest.t >/dev/null 2>&1; then
      :
    elif test "${shared}" = "true"; then
      HLDFLAGS='-Wl,-rpath=$(libdir)'
    else
      HLDFLAGS='-Wl,-rpath='
    fi
    rm -f conftest.t conftest.c conftest
    ;;
esac
AC_SUBST(HLDFLAGS)
AC_SUBST(HLDENV)
# End stuff to support --enable-shared

# target_subdir is used by the testsuite to find the target libraries.
target_subdir=
if test "${host}" != "${target}"; then
    target_subdir="${target_alias}/"
fi
AC_SUBST(target_subdir)

frags=
host_makefile_frag=${srcdir}/config/${gdb_host_cpu}/${gdb_host}.mh
if test ! -f ${host_makefile_frag}; then
AC_MSG_ERROR("*** Gdb does not support host ${host}")
fi
frags="$frags $host_makefile_frag"

target_makefile_frag=${srcdir}/config/${gdb_target_cpu}/${gdb_target}.mt
if test ! -f ${target_makefile_frag}; then
AC_MSG_ERROR("*** Gdb does not support target ${target}")
fi
frags="$frags $target_makefile_frag"

AC_SUBST_FILE(host_makefile_frag)
AC_SUBST_FILE(target_makefile_frag)
AC_SUBST(frags)

changequote(,)dnl
hostfile=`sed -n '
s/XM_FILE[ 	]*=[ 	]*\([^ 	]*\)/\1/p
' ${host_makefile_frag}`

targetfile=`sed -n '
s/TM_FILE[ 	]*=[ 	]*\([^ 	]*\)/\1/p
' ${target_makefile_frag}`

# these really aren't orthogonal true/false values of the same condition,
# but shells are slow enough that I like to reuse the test conditions
# whenever possible
if test "${target}" = "${host}"; then
nativefile=`sed -n '
s/NAT_FILE[ 	]*=[ 	]*\([^ 	]*\)/\1/p
' ${host_makefile_frag}`
# else
# GDBserver is only useful in a "native" enviroment
# configdirs=`echo $configdirs | sed 's/gdbserver//'`
fi
changequote([,])

# If hostfile (XM_FILE) and/or targetfile (TM_FILE) and/or nativefile
# (NAT_FILE) is not set in config/*/*.m[ht] files, we don't make the
# corresponding links.  But we have to remove the xm.h files and tm.h
# files anyway, e.g. when switching from "configure host" to
# "configure none".

files=
links=
rm -f xm.h
if test "${hostfile}" != ""; then
files="${files} config/${gdb_host_cpu}/${hostfile}"
links="${links} xm.h"
fi
rm -f tm.h
if test "${targetfile}" != ""; then
files="${files} config/${gdb_target_cpu}/${targetfile}"
links="${links} tm.h"
fi
rm -f nm.h
if test "${nativefile}" != ""; then
files="${files} config/${gdb_host_cpu}/${nativefile}"
links="${links} nm.h"
else
# A cross-only configuration.
files="${files} config/nm-empty.h"
links="${links} nm.h"
fi
# start-sanitize-gdbtk
AC_PROG_LN_S
# Make it possible to use the GUI without doing a full install
if test "${enable_gdbtk}" = "yes" -a ! -d gdbtcl ; then
  if test "$LN_S" = "ln -s" -a ! -f gdbtcl ; then
  echo linking $srcdir/gdbtcl to gdbtcl
  $LN_S $srcdir/gdbtcl gdbtcl
  else
  echo Warning: Unable to link $srcdir/gdbtcl to gdbtcl.  You will need to do a
  echo "         " make install before you are able to run the GUI.
  fi
fi
# end-sanitize-gdbtk

AC_LINK_FILES($files, $links)

dnl Check for exe extension set on certain hosts (e.g. Win32)
AM_EXEEXT

AC_CONFIG_SUBDIRS($configdirs)
AC_OUTPUT(Makefile .gdbinit:gdbinit.in,
[
dnl Autoconf doesn't provide a mechanism for modifying definitions 
dnl provided by makefile fragments.
dnl
if test "${nativefile}" = ""; then
sed -e '/^NATDEPFILES[[ 	]]*=[[ 	]]*/s//# NATDEPFILES=/' \
	< Makefile > Makefile.tem
mv -f Makefile.tem Makefile
fi

changequote(,)dnl
sed -e '/^TM_FILE[ 	]*=/s,^TM_FILE[ 	]*=[ 	]*,&config/'"${gdb_target_cpu}"'/,
/^XM_FILE[ 	]*=/s,^XM_FILE[ 	]*=[ 	]*,&config/'"${gdb_host_cpu}"'/,
/^NAT_FILE[ 	]*=/s,^NAT_FILE[ 	]*=[ 	]*,&config/'"${gdb_host_cpu}"'/,' <Makefile >Makefile.tmp
mv -f Makefile.tmp Makefile
changequote([,])dnl

case x$CONFIG_HEADERS in
xconfig.h:config.in)
echo > stamp-h ;;
esac
],
[
gdb_host_cpu=$gdb_host_cpu
gdb_target_cpu=$gdb_target_cpu
nativefile=$nativefile
])

exit 0