tools: add mold, a modern linker

mold is a faster drop-in replacement for existing Unix linkers.

A single binary is able to link various targets, which is why this lives
in tools/.

All toolchain builds then just need to copy the linker over, hence avoiding
multiple builds with the same outcome.

Signed-off-by: Andre Heider <[email protected]>

tools/Makefile

@@ -83,6 +83,7 @@ tools-$(if $(CONFIG_BUILD_ALL_HOST_TOOLS)$(CONFIG_TARGET_tegra),y) += cbootimage
 tools-$(if $(CONFIG_BUILD_ALL_HOST_TOOLS)$(CONFIG_USES_MINOR),y) += kernel2minor
 tools-$(if $(CONFIG_BUILD_ALL_HOST_TOOLS)$(CONFIG_USE_SPARSE),y) += sparse
 tools-$(if $(CONFIG_BUILD_ALL_HOST_TOOLS)$(CONFIG_USE_LLVM_BUILD),y) += llvm-bpf
+tools-$(if $(CONFIG_BUILD_ALL_HOST_TOOLS)$(CONFIG_USE_MOLD),y) += mold
 
 # builddir dependencies
 $(curdir)/autoconf/compile := $(curdir)/m4/compile
@@ -114,6 +115,7 @@ $(curdir)/meson/compile := $(curdir)/ninja/compile
 $(curdir)/missing-macros/compile := $(curdir)/autoconf/compile
 $(curdir)/mkimage/compile += $(curdir)/bison/compile $(curdir)/libressl/compile
 $(curdir)/mklibs/compile := $(curdir)/libtool/compile
+$(curdir)/mold/compile := $(curdir)/cmake/compile $(curdir)/zlib/compile $(curdir)/zstd/compile
 $(curdir)/mpc/compile := $(curdir)/mpfr/compile $(curdir)/gmp/compile
 $(curdir)/mpfr/compile := $(curdir)/gmp/compile
 $(curdir)/mtd-utils/compile := $(curdir)/libtool/compile $(curdir)/e2fsprogs/compile $(curdir)/zlib/compile

tools/mold/Makefile

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=mold
+PKG_VERSION:=1.11.0
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL_FILE:=v$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://github.com/rui314/mold/archive/refs/tags
+PKG_HASH:=99318eced81b09a77e4c657011076cc8ec3d4b6867bd324b8677974545bc4d6f
+
+include $(INCLUDE_DIR)/host-build.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+CMAKE_HOST_OPTIONS += \
+	-DMOLD_LTO=ON \
+	-DMOLD_MOSTLY_STATIC=ON \
+	-DMOLD_USE_SYSTEM_MIMALLOC=OFF \
+	-DMOLD_USE_SYSTEM_TBB=OFF
+
+$(eval $(call HostBuild))