Add support for gold linker and LTO for GCC.

index 08540a3..a6e5ba6 100644
@@ -1,5 +1,8 @@
 comment "Binutils Options"
 
+config BR2_BINUTILS_SUPPORTS_GOLD
+	bool "binutils 2.24"
+
 choice
 	prompt "Binutils Version"
 	depends on !BR2_arc

@@ -42,6 +45,7 @@ choice
 
 	config BR2_BINUTILS_VERSION_2_24
 		depends on !BR2_avr32
+		select BR2_BINUTILS_SUPPORTS_GOLD
 		bool "binutils 2.24"
 
 endchoice

index 9cc4d28..5e32b2d 100644
@@ -62,6 +62,18 @@ HOST_BINUTILS_CONF_OPT = --disable-multilib --disable-werror \
 			--with-sysroot=$(STAGING_DIR) \
 			$(BINUTILS_EXTRA_CONFIG_OPTIONS)
 
+# disable ld explicitely and use ld.gold exclusively
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT_GOLD),y)
+HOST_BINUTILS_CONF_OPT += \
+           --enable-plugins \
+           --enable-gold \
+           --disable-ld
+endif
+
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT_LTO),y)
+HOST_BINUTILS_CONF_OPT += --enable-lto
+endif
+
 # We just want libbfd and libiberty, not the full-blown binutils in staging
 define BINUTILS_INSTALL_STAGING_CMDS
 	$(MAKE) -C $(@D)/bfd DESTDIR=$(STAGING_DIR) install

new file mode 100644
index 0000000..c45512a
@@ -0,0 +1,35 @@
+--- a/gcc/gcc-ar.c	2014-04-29 23:54:09.387237442 +0000
++++ b/gcc/gcc-ar.c	2014-04-29 23:52:35.184336991 +0000
+@@ -123,6 +126,7 @@
+ int 
+ main (int ac, char **av)
+ {
++  char real_exe_bin_name[256];
+   const char *exe_name;
+   char *plugin;
+   int k, status, err;
+@@ -143,20 +147,12 @@
+     }
+ 
+   /* Find the wrapped binutils program.  */
+-  exe_name = find_a_file (&target_path, PERSONALITY, X_OK);
++  exe_name = find_a_file (&target_path, PERSONALITY "-bin", X_OK);
+   if (!exe_name)
+     {
+-      const char *real_exe_name = PERSONALITY;
+-#ifdef CROSS_DIRECTORY_STRUCTURE
+-      real_exe_name = concat (target_machine, "-", PERSONALITY, NULL);
+-#endif
+-      exe_name = find_a_file (&path, real_exe_name, X_OK);
+-      if (!exe_name)
+-	{
+-	  fprintf (stderr, "%s: Cannot find binary '%s'\n", av[0],
+-		   real_exe_name);
+-	  exit (1);
+-	}
++      exe_name = real_exe_bin_name;
++      strcpy(real_exe_bin_name, av[0]);
++      strcat(real_exe_bin_name, "-bin");
+     }
+ 
+   /* Create new command line with plugin */

new file mode 100644
index 0000000..c45512a
@@ -0,0 +1,35 @@
+--- a/gcc/gcc-ar.c	2014-04-29 23:54:09.387237442 +0000
++++ b/gcc/gcc-ar.c	2014-04-29 23:52:35.184336991 +0000
+@@ -123,6 +126,7 @@
+ int 
+ main (int ac, char **av)
+ {
++  char real_exe_bin_name[256];
+   const char *exe_name;
+   char *plugin;
+   int k, status, err;
+@@ -143,20 +147,12 @@
+     }
+ 
+   /* Find the wrapped binutils program.  */
+-  exe_name = find_a_file (&target_path, PERSONALITY, X_OK);
++  exe_name = find_a_file (&target_path, PERSONALITY "-bin", X_OK);
+   if (!exe_name)
+     {
+-      const char *real_exe_name = PERSONALITY;
+-#ifdef CROSS_DIRECTORY_STRUCTURE
+-      real_exe_name = concat (target_machine, "-", PERSONALITY, NULL);
+-#endif
+-      exe_name = find_a_file (&path, real_exe_name, X_OK);
+-      if (!exe_name)
+-	{
+-	  fprintf (stderr, "%s: Cannot find binary '%s'\n", av[0],
+-		   real_exe_name);
+-	  exit (1);
+-	}
++      exe_name = real_exe_bin_name;
++      strcpy(real_exe_bin_name, av[0]);
++      strcat(real_exe_bin_name, "-bin");
+     }
+ 
+   /* Create new command line with plugin */

index b6d4b5e..ea464bf 100644
@@ -6,6 +6,9 @@ config BR2_GCC_NEEDS_MPC
 config BR2_GCC_SUPPORTS_GRAPHITE
 	bool
 
+config BR2_GCC_SUPPORTS_GOLD
+	bool
+
 choice
 	prompt "GCC compiler Version"
 	default BR2_GCC_VERSION_4_4_X if BR2_sparc_sparchfleon || BR2_sparc_sparchfleonv8 || BR2_sparc_sparcsfleon || BR2_sparc_sparcsfleonv8

@@ -64,6 +67,7 @@ choice
 		depends on !BR2_microblaze && !BR2_arc && !BR2_avr32 && !BR2_bfin && !BR2_cortex_a12 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_powerpc64le
 		select BR2_GCC_NEEDS_MPC
 		select BR2_GCC_SUPPORTS_GRAPHITE
+		select BR2_GCC_SUPPORTS_GOLD
 		bool "gcc 4.8.x"
 
 	config BR2_GCC_VERSION_4_8_ARC

@@ -75,6 +79,7 @@ choice
 		depends on !BR2_arc && !BR2_avr32 && !BR2_bfin && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8
 		select BR2_GCC_NEEDS_MPC
 		select BR2_GCC_SUPPORTS_GRAPHITE
+		select BR2_GCC_SUPPORTS_GOLD
 		bool "gcc 4.9.x"
 
 	config BR2_GCC_VERSION_SNAP

@@ -147,6 +152,13 @@ config BR2_INSTALL_OBJC
 	  cross-compiler, and install the Objective-C runtime to the
 	  target.
 
+config BR2_GCC_ENABLE_GRAPHITE
+   bool "Enable compiler graphite optimisations"
+   depends on BR2_GCC_SUPPORTS_GRAPHITE
+   help
+     Enable the compiler to support graphite optimisations
+
+
 config BR2_INSTALL_FORTRAN
 	bool "Enable Fortran support"
 	depends on !BR2_avr32

@@ -186,10 +198,3 @@ config BR2_GCC_ENABLE_LIBMUDFLAP
 	  the help of the gcc -fmudflap option for more details.
 
 	  If you're unsure, leave this option disabled.
-
-config BR2_GCC_ENABLE_GRAPHITE
-	bool "Enable graphite support"
-	depends on BR2_GCC_SUPPORTS_GRAPHITE
-	help
-	  This option enables the graphite optimizations in the
-	  compiler.

index bc5ad26..57df10d 100644
@@ -40,4 +40,22 @@ HOST_GCC_INITIAL_CONF_ENV = \
 HOST_GCC_INITIAL_MAKE_OPT = all-gcc
 HOST_GCC_INITIAL_INSTALL_OPT = install-gcc
 
+# Extremely nasty hack for setting up links for binutils programs that are
+# executed using the wrapper.
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT_GOLD),y)
+define HOST_GCC_INSTALL_WRAPPERS
+        for i in ar nm ranlib ; do \
+			_tmp=$(HOST_DIR)/usr/bin/$(GNU_TARGET_NAME)-$${i}; \
+	        if [ ! -f "$${_tmp}-bin" ] ; then \
+				mv $${_tmp} $${_tmp}-bin; \
+				cp -dpf $$(echo $${_tmp} | sed 's:-[^-]*$$:-gcc&:') $${_tmp}; \
+				ln -f $${_tmp}-bin $(HOST_DIR)/usr/$(GNU_TARGET_NAME)/bin/$${i}-bin; \
+				ln -f $${_tmp} $(HOST_DIR)/usr/$(GNU_TARGET_NAME)/bin/$${i}; \
+			fi; \
+        done; \
+		ln -fs $(HOST_DIR)/usr/libexec $(HOST_DIR)/usr/$(GNU_TARGET_NAME)/libexec
+endef
+HOST_GCC_INITIAL_POST_INSTALL_HOOKS += HOST_GCC_INSTALL_WRAPPERS
+endif
+
 $(eval $(host-autotools-package))

index 5b60bc3..6980fa8 100644
@@ -213,6 +213,17 @@ ifneq ($(GCC_TARGET_MODE),)
 HOST_GCC_COMMON_CONF_OPT += --with-mode=$(GCC_TARGET_MODE)
 endif
 
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT_GOLD),y)
+HOST_GCC_COMMON_CONF_OPT += \
+           --enable-plugins \
+           --enable-gold \
+           --disable-ld
+endif
+
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT_LTO),y)
+HOST_GCC_COMMON_CONF_OPT += --enable-lto
+endif
+
 # Branding works on >= 4.3
 ifneq ($(findstring x4.2.,x$(GCC_VERSION)),x4.2.)
 HOST_GCC_COMMON_CONF_OPT += \

index eef9f9c..8f38b4f 100644
@@ -100,6 +100,17 @@ config BR2_TOOLCHAIN_BUILDROOT_LIBC
 	default "glibc"  if BR2_TOOLCHAIN_BUILDROOT_GLIBC
 	default "musl"	 if BR2_TOOLCHAIN_BUILDROOT_MUSL
 
+config BR2_TOOLCHAIN_BUILDROOT_GOLD
+	bool "gold (experimental)"
+	depends on BR2_BINUTILS_SUPPORTS_GOLD
+	depends on BR2_GCC_SUPPORTS_GOLD
+	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_x86_64
+
+config BR2_TOOLCHAIN_BUILDROOT_LTO
+	bool "lto (experimental)"
+	depends on BR2_TOOLCHAIN_BUILDROOT_GOLD
+	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_x86_64
+
 source "package/uclibc/Config.in"
 source "package/glibc/Config.in"
 source "package/binutils/Config.in.host"