[Bug lto/47225] [4.6.0 regression]: cross-compile fails while configuring libgcc with "xgcc: fatal error: -fuse-linker-plugin, but liblto_plugin.so not found"

["hubicka at ucw dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47225

--- Comment #4 from Jan Hubicka <hubicka at ucw dot cz> 2011-01-08 19:15:24 UTC ---
Hi,
since lto plugin already enables shared libiberty, this patch extends the
machinery
for plugin itself too.
Does it fix your problem? I seem to be able to bootstrap (C only) with
disable-shared.

Index: configure
===================================================================
--- configure    (revision 168596)
+++ configure    (working copy)
@@ -640,6 +640,7 @@ CFLAGS_FOR_TARGET
 DEBUG_PREFIX_CFLAGS_FOR_TARGET
 SYSROOT_CFLAGS_FOR_TARGET
 stage1_languages
+extra_host_lto_plugin_configure_flags
 extra_host_libiberty_configure_flags
 clooginc
 clooglibs
@@ -6237,6 +6238,7 @@ if test -d ${srcdir}/gcc; then

   # If LTO is enabled, add the LTO front end.
   extra_host_libiberty_configure_flags=
+  extra_host_lto_plugin_configure_flags=
   if test "$enable_lto" = "yes" ; then
     case ,${enable_languages}, in
       *,lto,*) ;;
@@ -6245,10 +6247,12 @@ if test -d ${srcdir}/gcc; then
     if test "${build_lto_plugin}" = "yes" ; then
       configdirs="$configdirs lto-plugin"
       extra_host_libiberty_configure_flags=--enable-shared
+      extra_host_lto_plugin_configure_flags=--enable-shared
     fi
   fi


+
   missing_languages=`echo ",$enable_languages," | sed -e s/,all,/,/ -e
s/,c,/,/ `
   potential_languages=,c,

Index: configure.ac
===================================================================
--- configure.ac    (revision 168596)
+++ configure.ac    (working copy)
@@ -1810,6 +1810,7 @@ if test -d ${srcdir}/gcc; then

   # If LTO is enabled, add the LTO front end.
   extra_host_libiberty_configure_flags=
+  extra_host_lto_plugin_configure_flags=
   if test "$enable_lto" = "yes" ; then
     case ,${enable_languages}, in
       *,lto,*) ;;
@@ -1818,9 +1819,11 @@ if test -d ${srcdir}/gcc; then
     if test "${build_lto_plugin}" = "yes" ; then
       configdirs="$configdirs lto-plugin"
       extra_host_libiberty_configure_flags=--enable-shared
+      extra_host_lto_plugin_configure_flags=--enable-shared
     fi
   fi
   AC_SUBST(extra_host_libiberty_configure_flags)
+  AC_SUBST(extra_host_lto_plugin_configure_flags)

   missing_languages=`echo ",$enable_languages," | sed -e s/,all,/,/ -e
s/,c,/,/ `
   potential_languages=,c,
Index: Makefile.def
===================================================================
--- Makefile.def    (revision 168596)
+++ Makefile.def    (working copy)
@@ -145,7 +145,8 @@ host_modules= { module= libtermcap; no_c
                 missing=maintainer-clean; };
 host_modules= { module= utils; no_check=true; };
 host_modules= { module= gnattools; };
-host_modules= { module= lto-plugin; bootstrap=true; };
+host_modules= { module= lto-plugin; bootstrap=true;
+        extra_configure_flags='@extra_host_lto_plugin_configure_flags@'; };

 target_modules = { module= libstdc++-v3;
            bootstrap=true;
Index: Makefile.in
===================================================================
--- Makefile.in    (revision 168596)
+++ Makefile.in    (working copy)
@@ -45248,7 +45248,7 @@ configure-lto-plugin:
     libsrcdir="$$s/lto-plugin"; \
     $(SHELL) $${libsrcdir}/configure \
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
-      --target=${target_alias} $${srcdiroption}  \
+      --target=${target_alias} $${srcdiroption}
@extra_host_lto_plugin_configure_flags@ \
       || exit 1
 @endif lto-plugin

@@ -45282,7 +45282,8 @@ configure-stage1-lto-plugin:
     $(SHELL) $${libsrcdir}/configure \
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
       --target=${target_alias} $${srcdiroption} \
-      $(STAGE1_CONFIGURE_FLAGS)
+      $(STAGE1_CONFIGURE_FLAGS) \
+      @extra_host_lto_plugin_configure_flags@
 @endif lto-plugin-bootstrap

 .PHONY: configure-stage2-lto-plugin maybe-configure-stage2-lto-plugin
@@ -45315,7 +45316,8 @@ configure-stage2-lto-plugin:
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
       --target=${target_alias} $${srcdiroption} \
       --with-build-libsubdir=$(HOST_SUBDIR) \
-      $(STAGE2_CONFIGURE_FLAGS)
+      $(STAGE2_CONFIGURE_FLAGS) \
+      @extra_host_lto_plugin_configure_flags@
 @endif lto-plugin-bootstrap

 .PHONY: configure-stage3-lto-plugin maybe-configure-stage3-lto-plugin
@@ -45348,7 +45350,8 @@ configure-stage3-lto-plugin:
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
       --target=${target_alias} $${srcdiroption} \
       --with-build-libsubdir=$(HOST_SUBDIR) \
-      $(STAGE3_CONFIGURE_FLAGS)
+      $(STAGE3_CONFIGURE_FLAGS) \
+      @extra_host_lto_plugin_configure_flags@
 @endif lto-plugin-bootstrap

 .PHONY: configure-stage4-lto-plugin maybe-configure-stage4-lto-plugin
@@ -45381,7 +45384,8 @@ configure-stage4-lto-plugin:
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
       --target=${target_alias} $${srcdiroption} \
       --with-build-libsubdir=$(HOST_SUBDIR) \
-      $(STAGE4_CONFIGURE_FLAGS)
+      $(STAGE4_CONFIGURE_FLAGS) \
+      @extra_host_lto_plugin_configure_flags@
 @endif lto-plugin-bootstrap

 .PHONY: configure-stageprofile-lto-plugin
maybe-configure-stageprofile-lto-plugin
@@ -45414,7 +45418,8 @@ configure-stageprofile-lto-plugin:
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
       --target=${target_alias} $${srcdiroption} \
       --with-build-libsubdir=$(HOST_SUBDIR) \
-      $(STAGEprofile_CONFIGURE_FLAGS)
+      $(STAGEprofile_CONFIGURE_FLAGS) \
+      @extra_host_lto_plugin_configure_flags@
 @endif lto-plugin-bootstrap

 .PHONY: configure-stagefeedback-lto-plugin
maybe-configure-stagefeedback-lto-plugin
@@ -45447,7 +45452,8 @@ configure-stagefeedback-lto-plugin:
       $(HOST_CONFIGARGS) --build=${build_alias} --host=${host_alias} \
       --target=${target_alias} $${srcdiroption} \
       --with-build-libsubdir=$(HOST_SUBDIR) \
-      $(STAGEfeedback_CONFIGURE_FLAGS)
+      $(STAGEfeedback_CONFIGURE_FLAGS) \
+      @extra_host_lto_plugin_configure_flags@
 @endif lto-plugin-bootstrap