RFA: fix rdi-share subdir selection in configure

[Jim Blandy <jimb at redhat dot com>]

In this thread:

http://sources.redhat.com/ml/gdb-patches/2005-01/msg00038.html

the configury for the rdi-share subdirectory was disabled, because the
configure.tgt and configure.ac scripts handled it in a way which is no
longer kosher in Autoconf 2.59.  The patch below changes that to work
in a 2.59-friendly way, and allows embedded arm-elf to build again.

Here's the portion of the autoconf 2.59 manual that explains how it
wants us to handle optional subdirectories:

    Configuring Other Packages in Subdirectories
    ============================================

    In most situations, calling `AC_OUTPUT' is sufficient to produce
    `Makefile's in subdirectories.  However, `configure' scripts that
    control more than one independent package can use `AC_CONFIG_SUBDIRS'
    to run `configure' scripts for other packages in subdirectories.

     - Macro: AC_CONFIG_SUBDIRS (DIR ...)
         Make `AC_OUTPUT' run `configure' in each subdirectory DIR in the
         given whitespace-separated list.  Each DIR should be a literal,
         i.e., please do not use:

              if test "$package_foo_enabled" = yes; then
                $my_subdirs="$my_subdirs foo"
              fi
              AC_CONFIG_SUBDIRS($my_subdirs)

         because this prevents `./configure --help=recursive' from
         displaying the options of the package `foo'.  Rather, you should
         write:

              if test "$package_foo_enabled" = yes; then
                AC_CONFIG_SUBDIRS(foo)
              fi

2005-01-19  Jim Blandy  <jimb@redhat.com>

	* configure.tgt: Set build_rdi_share to "yes" on those targets
	that use that debugging protocol.
	* configure.ac: If build_rdi_share is "yes", then configure the
	rdi-share subdirectory.

Index: gdb/configure.ac
===================================================================
RCS file: /cvs/src/src/gdb/configure.ac,v
retrieving revision 1.3
diff -c -p -r1.3 configure.ac
*** gdb/configure.ac	16 Jan 2005 22:51:49 -0000	1.3
--- gdb/configure.ac	19 Jan 2005 20:28:16 -0000
*************** if test "x$target" = "x$host"; then
*** 1508,1513 ****
--- 1508,1518 ----
    fi
  fi
  
+ # We build rdi-share on ARM-based targets, as instructed by configure.tgt.
+ if test "x$build_rdi_share" = xyes; then
+    AC_CONFIG_SUBDIRS(rdi-share)
+ fi
+ 
  # If hostfile (XM_FILE) and/or targetfile (DEPRECATED_TM_FILE) and/or
  # nativefile (NAT_FILE) is not set in config/*/*.m[ht] files, we link
  # to an empty version.
Index: gdb/configure.tgt
===================================================================
RCS file: /cvs/src/src/gdb/configure.tgt,v
retrieving revision 1.157
diff -c -p -r1.157 configure.tgt
*** gdb/configure.tgt	7 Jan 2005 16:22:33 -0000	1.157
--- gdb/configure.tgt	19 Jan 2005 20:28:16 -0000
*************** arm*-*-netbsd* | arm*-*-knetbsd*-gnu)
*** 56,71 ****
  arm-*-nto*)		gdb_target=nto ;;
  arm*-*-* | thumb*-*-* | strongarm*-*-*)
  			gdb_target=embed
! 			# FIXME: cagney/2005-01-07: The configdirs
! 			# variable doesn't work with autoconf 2.59.
! 			# Disabled.
!                         # configdirs="$configdirs rdi-share"
                          ;;
  xscale-*-*)		gdb_target=embed
! 			# FIXME: cagney/2005-01-07: The configdirs
! 			# variable doesn't work with autoconf 2.59.
! 			# Disabled.
!                         # configdirs="$configdirs rdi-share"
                          ;;
  
  avr-*-*)		gdb_target=avr ;;
--- 56,65 ----
  arm-*-nto*)		gdb_target=nto ;;
  arm*-*-* | thumb*-*-* | strongarm*-*-*)
  			gdb_target=embed
!                         build_rdi_share=yes
                          ;;
  xscale-*-*)		gdb_target=embed
!                         build_rdi_share=yes
                          ;;
  
  avr-*-*)		gdb_target=avr ;;
*************** i[34567]86-*-linux*)	gdb_target=linux
*** 96,105 ****
  			;;
  i[34567]86-*-gnu*)	gdb_target=i386gnu ;;
  i[34567]86-*-netware*)	gdb_target=i386
! 			# FIXME: cagney/2005-01-07: The configdirs
! 			# variable doesn't work with autoconf 2.59.
! 			# Disabled.
! 			# configdirs="${configdirs} nlm"
  			;;
  i[34567]86-*-cygwin*)	gdb_target=cygwin  ;;
  i[34567]86-*-*)		gdb_target=i386 ;;
--- 90,96 ----
  			;;
  i[34567]86-*-gnu*)	gdb_target=i386gnu ;;
  i[34567]86-*-netware*)	gdb_target=i386
!                         build_rdi_share=yes
  			;;
  i[34567]86-*-cygwin*)	gdb_target=cygwin  ;;
  i[34567]86-*-*)		gdb_target=i386 ;;