(Toplevel patch) Clean up use of enable_shared, enable_threads.

[Nathanael Nerode <neroden@twcny.rr.com>]

This is intended to apply after my previous toplevel cleanup patches; I
noticed that, although set in the Makefile, they weren't used there or
passed down to anything, so it's dead code.  Every subdirectory which cares
appears to set them in its own configure script.

If this is the 'wrong direction' and I should instead be causing them to 
be passed down, let me know, but that seemed more invasive and would 
cause behavioral changes.

Bootstrapped i686-pc-linux-gnu.

	* Makefile.tpl: Don't set unused enable_shared, enable_threads macros.
	* Makefile.in: Regenerate.
	* configure.in: Remove unused logic relating to --enable-shared
	and --enable-threads.
	* configure: Regenerate.

--- Makefile.tpl.old	2003-02-25 15:39:04.000000000 -0500
+++ Makefile.tpl	2003-02-25 15:48:44.000000000 -0500
@@ -87,8 +87,6 @@
 # -------------------------------------------------
 
 links=@configlinks@
-enable_shared = @enable_shared@
-enable_threads = @enable_threads@
 enable_version_specific_runtime_libs = @enable_version_specific_runtime_libs@
 # The file containing GCC's version number.
 gcc_version_trigger = @gcc_version_trigger@
--- configure.in.old	2003-02-25 15:44:39.000000000 -0500
+++ configure.in	2003-02-25 15:48:57.000000000 -0500
@@ -1217,29 +1217,6 @@
   extra_host_args="$extra_host_args --with-newlib"
 fi
 
-# Default to disabling threads.
-case "${enable_threads}" in
-  "") enable_threads=no ;;
-esac
-
-# We default to --with-shared on platforms where -fpic is meaningless.
-# Well, we don't yet, but we will.
-if false && test "${host}" = "${target}" && test x${enable_shared} = x ; then
-  case "${target}" in
-    alpha*-dec-osf*)	enable_shared=yes ;;
-    alpha*-*-linux*)	enable_shared=yes ;;
-    mips-sgi-irix5*)	enable_shared=yes ;;
-    *)			enable_shared=no ;;
-  esac
-fi
-
-case "${enable_shared}" in
-  yes) shared=yes ;;
-  no) shared=no ;;
-  "") shared=no ; enable_shared=no ;;
-  *) shared=yes ;;
-esac
-
 
 # Default to using --with-stabs for certain targets.
 if test x${with_stabs} = x ; then
@@ -1615,12 +1592,10 @@
 
 # If --enable-shared was set, we must set LD_LIBRARY_PATH so that the
 # binutils tools will find libbfd.so.
-if test "${shared}" = "yes" ; then
-  SET_LIB_PATH="\$(REALLY_SET_LIB_PATH)"
-else
-  SET_LIB_PATH=
-fi
-
+case "${enable_shared}" in
+  no | "") SET_LIB_PATH= ;;
+  *) SET_LIB_PATH="\$(REALLY_SET_LIB_PATH)" ;;
+esac
 
 case "${host}" in
   *-*-hpux*) RPATH_ENVVAR=SHLIB_PATH ;;
@@ -2007,8 +1982,6 @@
 AC_SUBST(BUILD_PREFIX)
 AC_SUBST(BUILD_PREFIX_1)
 AC_SUBST(configlinks)
-AC_SUBST(enable_shared)
-AC_SUBST(enable_threads)
 AC_SUBST(enable_version_specific_runtime_libs)
 AC_SUBST(gcc_version_trigger)
 AC_SUBST(gcc_version)