Various changes to support building shared lib{g,stdc}++

config/.Sanitize

@@ -59,6 +59,12 @@ mh-sysv
 mh-sysv4
 mh-vaxult2
 mt-v810
+mt-x86pic
+mt-papic
+mt-sparcpic
+mh-papic
+mh-x86pic
+mh-sparcpic
 
 Things-to-lose:
 

config/mh-papic

@@ -0,0 +1,2 @@
+LIBCFLAGS=$(CFLAGS) -fPIC
+LIBCXXFLAGS=$(CXXFLAGS) -fPIC

config/mh-sparcpic

@@ -0,0 +1,2 @@
+LIBCFLAGS=$(CFLAGS) -fpic
+LIBCXXFLAGS=$(CXXFLAGS) -fpic

config/mh-x86pic

@@ -0,0 +1,2 @@
+LIBCFLAGS=$(CFLAGS) -fpic
+LIBCXXFLAGS=$(CXXFLAGS) -fpic

config/mt-papic

@@ -0,0 +1,2 @@
+LIBCFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET) -fPIC
+LIBCXXFLAGS_FOR_TARGET=$(CXXFLAGS_FOR_TARGET) -fPIC

config/mt-sparcpic

@@ -0,0 +1,2 @@
+LIBCFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET) -fpic
+LIBCXXFLAGS_FOR_TARGET=$(CXXFLAGS_FOR_TARGET) -fpic

config/mt-x86pic

@@ -0,0 +1,2 @@
+LIBCFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET) -fpic
+LIBCXXFLAGS_FOR_TARGET=$(CXXFLAGS_FOR_TARGET) -fpic

configure.in

@@ -153,6 +153,30 @@ case "${host}" in
   ;;
 esac
 
+# We default to --with-shared on platforms where -fpic is meaningless.
+# Well, we don't yet, but we will.
+if false && [ "${host}" = "${target}" ] && [ x${enable_shared} = x ]; then
+  case "${target}" in
+    alpha-dec-osf*)	enable_shared=yes ;;
+    mips-sgi-irix5*)	enable_shared=yes ;;
+    *)			enable_shared=no ;;
+  esac
+fi
+
+if [ x${enable_shared} = xyes ]; then
+  waugh=
+  case "${host}" in
+    hppa*-*-*)		waugh=config/mh-papic ;;
+    i[345]86-*-*)	waugh=config/mh-x86pic ;;
+    *-*-*)		waugh=config/mh-${target_cpu}pic ;;
+  esac
+  if [ -n "${host_makefile_frag}" ] && [ -f ${srcdir}/${waugh} ]; then
+    cat ${srcdir}/${host_makefile_frag} > mh-frag
+    cat ${srcdir}/${waugh} >> mh-frag
+    host_makefile_frag=mh-frag
+  fi
+fi
+
 # per-target:
 
 case "${target}" in
@@ -498,6 +522,14 @@ if [ x${use_gnu_ld} = x ] ; then
   fi
 fi
 
+if [ x${enable_shared} = xyes ]; then
+  case "${target}" in
+    hppa*-*-*)		target_makefile_frag=config/mt-papic ;;
+    i[345]86-*-*)	target_makefile_frag=config/mt-x86pic ;;
+    *-*-*)		target_makefile_frag=config/mt-${target_cpu}pic ;;
+  esac
+fi
+
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