re PR driver/47244 (plugin linker is used unconditionally)

	PR driver/47244
	* gcc.c (PLUGIN_COND): Update to disable plugin unless -flto is used.
	(PLUGIN_COND_CLOSE): New macro.
	(LINK_COMMAND_SPEC): Update to use PLUGIN_COND_CLOSE.

From-SVN: r168717

gcc/ChangeLog

+2011-01-12  Jan Hubicka  <jh@suse.cz>
+
+	PR driver/47244
+	* gcc.c (PLUGIN_COND): Update to disable plugin unless -flto is used.
+	(PLUGIN_COND_CLOSE): New macro.
+	(LINK_COMMAND_SPEC): Update to use PLUGIN_COND_CLOSE.
+
 2011-01-12  Richard Guenther  <rguenther@suse.de>
 
 	PR lto/47259

gcc/gcc.c

@@ -621,11 +621,18 @@ proper position among the other output files.  */
 # endif
 #endif
 
-/* Conditional to test whether plugin is used or not.  */
+/* Conditional to test whether plugin is used or not.
+   FIXME: For slim LTO we will need to enable plugin unconditionally.  This
+   still cause problems with PLUGIN_LD != LD and when plugin is built but
+   not useable.  For GCC 4.6 we don't support slim LTO and thus we can enable
+   plugin only when LTO is enabled.  We still honor explicit
+   -fuse-linker-plugin.  */
 #ifdef HAVE_LTO_PLUGIN
-#define PLUGIN_COND "!fno-use-linker-plugin"
+#define PLUGIN_COND "!fno-use-linker-plugin:%{flto|flto=*|fuse-linker-plugin"
+#define PLUGIN_COND_CLOSE "}"
 #else
 #define PLUGIN_COND "fuse-linker-plugin"
+#define PLUGIN_COND_CLOSE ""
 #endif
 
 
@@ -646,9 +653,9 @@ proper position among the other output files.  */
     -plugin-opt=%(lto_wrapper) \
     -plugin-opt=-fresolution=%u.res \
     %{!nostdlib:%{!nodefaultlibs:%:pass-through-libs(%(link_gcc_c_sequence))}} \
-    } \
-    %{flto*:%<fcompare-debug*} \
-    %{flto*} %l " LINK_PIE_SPEC \
+    }"PLUGIN_COND_CLOSE" \
+    %{flto|flto=*:%<fcompare-debug*} \
+    %{flto} %{flto=*} %l " LINK_PIE_SPEC \
    "%X %{o*} %{e*} %{N} %{n} %{r}\
     %{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!nostartfiles:%S}}\
     %{static:} %{L*} %(mfwrap) %(link_libgcc) %o\