Add support for gold linker and LTO for GCC.

index 08540a3..de7f29a 100644
@@ -42,6 +42,7 @@ choice
 
 	config BR2_BINUTILS_VERSION_2_24
 		depends on !BR2_avr32
+		select BR2_BINUTILS_SUPPORTS_GOLD
 		bool "binutils 2.24"
 
 endchoice

index 9cc4d28..dcca490 100644
@@ -44,10 +44,10 @@ endif
 
 # We need to specify host & target to avoid breaking ARM EABI
 BINUTILS_CONF_OPT = --disable-multilib --disable-werror \
-		--host=$(GNU_TARGET_NAME) \
-		--target=$(GNU_TARGET_NAME) \
-		--enable-install-libiberty \
-		$(BINUTILS_EXTRA_CONFIG_OPTIONS)
+	--host=$(GNU_TARGET_NAME) \
+	--target=$(GNU_TARGET_NAME) \
+	--enable-install-libiberty \
+	$(BINUTILS_EXTRA_CONFIG_OPTIONS)
 
 # Install binutils after busybox to prefer full-blown utilities
 ifeq ($(BR2_PACKAGE_BUSYBOX),y)

@@ -57,10 +57,22 @@ endif
 # "host" binutils should actually be "cross"
 # We just keep the convention of "host utility" for now
 HOST_BINUTILS_CONF_OPT = --disable-multilib --disable-werror \
-			--target=$(GNU_TARGET_NAME) \
-			--disable-shared --enable-static \
-			--with-sysroot=$(STAGING_DIR) \
-			$(BINUTILS_EXTRA_CONFIG_OPTIONS)
+	--target=$(GNU_TARGET_NAME) \
+	--disable-shared --enable-static \
+	--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

54 lines not on this page · raw message

54 lines not on this page · raw message

index fde1b90..c79a102 100644
@@ -64,6 +64,7 @@ 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 && !BR2_sparc
 		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 +76,7 @@ choice
 		depends on !BR2_arc && !BR2_avr32 && !BR2_bfin && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_sparc
 		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

index bc5ad26..717bbfd 100644
@@ -40,4 +40,22 @@ HOST_GCC_INITIAL_CONF_ENV = \
 HOST_GCC_INITIAL_MAKE_OPT = all-gcc
 HOST_GCC_INITIAL_INSTALL_OPT = install-gcc
 
+# Create LTO aware wrappers for ar, nm and ranlib if they are not present.
+# The wrappers just add a linker plugin option and support LTO and non-LTO objects.
+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..1aa1ee6 100644
@@ -100,6 +100,31 @@ 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 linker (experimental)"
+	depends on BR2_BINUTILS_SUPPORTS_GOLD
+	depends on BR2_GCC_SUPPORTS_GOLD
+	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_x86_64
+	help
+	  This option selects the gold ELF only linker from the
+	  binutils package. This is currently in beta. This
+	  option will only build and install the gold linker.
+
+	  http://sourceware.org/binutils/
+
+
+config BR2_TOOLCHAIN_BUILDROOT_LTO
+	bool "Link Time Optimisations (LTO) (experimental)"
+	depends on BR2_TOOLCHAIN_BUILDROOT_GOLD
+	depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_x86_64
+	help
+	  This option builds GCC with suppport for Link Time
+	  Optimisation (LTO). To enable this option you must be using
+	  gold as the linker and enable the use of the linker plugin
+	  by compiling with the -fuse-linker-plugin flag.
+
+	  http://gcc.gnu.org/wiki/LinkTimeOptimization
+
 source "package/uclibc/Config.in"
 source "package/glibc/Config.in"
 source "package/binutils/Config.in.host"