toolchain: add mold as additional linker

Install it as $tripple-ld.mold in order to use -fuse-ld=mold.

Signed-off-by: Andre Heider <a.heider@gmail.com>

toolchain/Makefile

@@ -27,7 +27,7 @@
 curdir:=toolchain
 
 # subdirectories to descend into
-$(curdir)/builddirs := $(if $(CONFIG_GDB),gdb) $(if $(CONFIG_EXTERNAL_TOOLCHAIN),wrapper,kernel-headers binutils gcc/initial gcc/final $(LIBC) fortify-headers) $(if $(CONFIG_NASM),nasm)
+$(curdir)/builddirs := $(if $(CONFIG_GDB),gdb) $(if $(CONFIG_EXTERNAL_TOOLCHAIN),wrapper,kernel-headers binutils gcc/initial gcc/final $(LIBC) fortify-headers) $(if $(CONFIG_NASM),nasm) $(if $(CONFIG_USE_MOLD),mold)
 
 # builddir dependencies
 ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)

toolchain/mold/Makefile

@@ -0,0 +1,22 @@
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/toolchain-build.mk
+
+define Host/Configure
+endef
+
+define Host/Compile
+endef
+
+define Host/Install
+	$(INSTALL_DIR) $(TOOLCHAIN_DIR)/bin
+	$(INSTALL_BIN) $(STAGING_DIR_HOST)/bin/mold $(TOOLCHAIN_DIR)/bin/$(REAL_GNU_TARGET_NAME)-ld.mold
+endef
+
+define Host/Clean
+endef
+
+$(eval $(call HostBuild))