http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48245
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.03.23 17:07:04
Ever Confirmed|0 |1
--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> 2011-03-23 17:07:04
UTC ---
I'll try this on *-darwin9 and a darwin9-X-cris-elf
(I assume we need to clone all the logic to cater for cross compiler cases... )
maybe this is getting complex enough to warrant a spec of its own? (and then we
could avoid cloning it)
===
Index: gcc/config/darwin.h
===================================================================
--- gcc/config/darwin.h (revision 171353)
+++ gcc/config/darwin.h (working copy)
@@ -174,6 +174,38 @@ extern GTY(()) int darwin_ms_struct;
#define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}"
\
" %{pthread:-D_REENTRANT}"
+/* Conditional to test whether the LTO 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 if the linker used understands -plugin. */
+
+/* The linker has some plugin support. */
+#if HAVE_LTO_PLUGIN > 0
+/* The linker used has full plugin support, use LTO plugin by default. */
+#if HAVE_LTO_PLUGIN == 2
+#define PLUGIN_COND "!fno-use-linker-plugin:%{flto|flto=*|fuse-linker-plugin"
+#define PLUGIN_COND_CLOSE "}"
+#else
+/* The linker used has limited plugin support, use LTO plugin with explicit
+ -fuse-linker-plugin. */
+#define PLUGIN_COND "fuse-linker-plugin"
+#define PLUGIN_COND_CLOSE ""
+#endif
+#define LINK_PLUGIN_SPEC \
+ "%{"PLUGIN_COND": \
+ -plugin %(linker_plugin_file) \
+ -plugin-opt=%(lto_wrapper) \
+ -plugin-opt=-fresolution=%u.res \
+ %{!nostdlib:%{!nodefaultlibs:%:pass-through-libs(%(link_gcc_c_sequence))}}
\
+ }"PLUGIN_COND_CLOSE
+#else
+/* The linker used doesn't support -plugin, reject -fuse-linker-plugin. */
+#define LINK_PLUGIN_SPEC "%{fuse-linker-plugin:\
+ %e-fuse-linker-plugin is not supported in this configuration}"
+#endif
+
/* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
precomp, libtool, and fat build additions.
@@ -185,6 +217,7 @@ extern GTY(()) int darwin_ms_struct;
#define LINK_COMMAND_SPEC_A \
"%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
%(linker) \
+ " LINK_PLUGIN_SPEC " \
%{flto*:%<fcompare-debug*} \
%{flto*} \
%l %X %{s} %{t} %{Z} %{u*} \
