add mold linker support

Signed-off-by: sbwml <[email protected]>

Author: sbwml

README.md

@@ -54,13 +54,6 @@ sudo apt-get install -y clang-15
 export USE_GLIBC=y
 ```
 
-### 启用 [GCC13](https://gcc.gnu.org/gcc-13/) 工具链编译
-##### 只需在构建固件前执行以下命令即可启用 GCC13 工具链
-
-```
-export USE_GCC13=y
-```
-
 ### 启用 [eBPF](https://docs.kernel.org/bpf/) 支持
 ##### 只需在构建固件前执行以下命令即可启用 eBPF 支持
 

openwrt/build.sh

@@ -84,11 +84,14 @@ export platform=$2
 [ "$platform" = "x86_64" ] && export platform="x86_64" toolchain_arch="x86_64"
 
 # gcc 13
-export USE_GCC13=$USE_GCC13
+USE_GCC13=y
 
 # use glibc
 export USE_GLIBC=$USE_GLIBC
 
+# use mold
+USE_MOLD=y
+
 # lrng
 export ENABLE_LRNG=$ENABLE_LRNG
 
@@ -122,6 +125,7 @@ fi
 echo -e "${GREEN_COLOR}Date: $CURRENT_DATE${RES}\r\n"
 
 [ "$USE_GCC13" = "y" ] && echo -e "${GREEN_COLOR}GCC VERSION: 13${RES}" || echo -e "${GREEN_COLOR}GCC VERSION: 11${RES}"
+[ "$USE_MOLD" = "y" ] && echo -e "${GREEN_COLOR}USE_MOLD: true${RES}" || echo -e "${GREEN_COLOR}USE_MOLD: false${RES}"
 [ "$ENABLE_OTA" = "y" ] && echo -e "${GREEN_COLOR}ENABLE_OTA: true${RES}" || echo -e "${GREEN_COLOR}ENABLE_OTA: false${RES}"
 [ "$ENABLE_BPF" = "y" ] && echo -e "${GREEN_COLOR}ENABLE_BPF: true${RES}" || echo -e "${GREEN_COLOR}ENABLE_BPF: false${RES}"
 [ "$ENABLE_LTO" = "y" ] && echo -e "${GREEN_COLOR}ENABLE_LTO: true${RES}" || echo -e "${GREEN_COLOR}ENABLE_LTO: false${RES}"
@@ -249,6 +253,9 @@ export ENABLE_LTO=$ENABLE_LTO
     sed -i '/NaiveProxy/d' .config
 }
 
+# mold
+[ "$USE_MOLD" = "y" ] && echo 'CONFIG_USE_MOLD=y' >> .config
+
 # openwrt-23.05 gcc11/13
 if [ "$USE_GCC13" = "y" ]; then
     curl -s https://$mirror/openwrt/generic/config-gcc13 >> .config

openwrt/patch/openwrt-6.x/mold/0001-build-add-support-to-use-the-mold-linker-for-package.patch

@@ -0,0 +1,32 @@
+From 18d4007ad731dfa625a6c03d1a946c453d7b92f2 Mon Sep 17 00:00:00 2001
+From: Andre Heider <[email protected]>
+Date: Fri, 27 Jan 2023 16:35:46 +0100
+Subject: [PATCH 1/8] build: add support to use the mold linker for packages
+
+If CONFIG_USE_MOLD is set, all target packages will use the mold linker.
+Except the ones which opted-out via setting PKG_BUILD_FLAGS:=no-mold.
+
+Signed-off-by: Andre Heider <[email protected]>
+---
+ include/package.mk | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/include/package.mk b/include/package.mk
+index c391d320aa..1791d6d9d4 100644
+--- a/include/package.mk
++++ b/include/package.mk
+@@ -55,6 +55,11 @@ ifeq ($(call pkg_build_flag,lto,$(if $(CONFIG_USE_LTO),1,0)),1)
+   TARGET_CXXFLAGS+= -flto=auto -fno-fat-lto-objects
+   TARGET_LDFLAGS+= -flto=auto -fuse-linker-plugin
+ endif
++ifdef CONFIG_USE_MOLD
++  ifeq ($(call pkg_build_flag,mold,1),1)
++    TARGET_LINKER:=mold
++  endif
++endif
+ 
+ include $(INCLUDE_DIR)/hardening.mk
+ include $(INCLUDE_DIR)/prereq.mk
+-- 
+2.39.3
+

openwrt/patch/openwrt-6.x/mold/0002-treewide-opt-out-of-tree-wide-mold-usage.patch

@@ -0,0 +1,81 @@
+From b7619a40b1497d974fef2bcc07bfef6da93e049a Mon Sep 17 00:00:00 2001
+From: Andre Heider <[email protected]>
+Date: Fri, 27 Jan 2023 18:22:43 +0100
+Subject: [PATCH 2/8] treewide: opt-out of tree-wide mold usage
+
+These use linker scripts, which mold doesn't support.
+
+Signed-off-by: Andre Heider <[email protected]>
+---
+ include/package.mk                               | 2 +-
+ package/boot/grub2/Makefile                      | 2 +-
+ package/kernel/lantiq/ltq-ifxos/Makefile         | 1 +
+ package/kernel/lantiq/ltq-vdsl-vr11-mei/Makefile | 1 +
+ package/kernel/lantiq/ltq-vdsl-vr11/Makefile     | 1 +
+ 5 files changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/include/package.mk b/include/package.mk
+index 1791d6d9d4..61a26f0c43 100644
+--- a/include/package.mk
++++ b/include/package.mk
+@@ -24,7 +24,7 @@ PKG_JOBS?=$(if $(PKG_BUILD_PARALLEL),$(MAKE_J),-j1)
+ endif
+ 
+ PKG_BUILD_FLAGS?=
+-__unknown_flags=$(filter-out no-iremap no-mips16 gc-sections no-gc-sections lto no-lto,$(PKG_BUILD_FLAGS))
++__unknown_flags=$(filter-out no-iremap no-mips16 gc-sections no-gc-sections lto no-lto no-mold,$(PKG_BUILD_FLAGS))
+ ifneq ($(__unknown_flags),)
+   $(error unknown PKG_BUILD_FLAGS: $(__unknown_flags))
+ endif
+diff --git a/package/boot/grub2/Makefile b/package/boot/grub2/Makefile
+index 865feee9ad..44dafe1ef1 100644
+--- a/package/boot/grub2/Makefile
++++ b/package/boot/grub2/Makefile
+@@ -25,7 +25,7 @@ ifneq ($(BUILD_VARIANT),none)
+ endif
+ 
+ PKG_FLAGS:=nonshared
+-PKG_BUILD_FLAGS:=no-lto
++PKG_BUILD_FLAGS:=no-lto no-mold
+ 
+ include $(INCLUDE_DIR)/host-build.mk
+ include $(INCLUDE_DIR)/package.mk
+diff --git a/package/kernel/lantiq/ltq-ifxos/Makefile b/package/kernel/lantiq/ltq-ifxos/Makefile
+index d941a9d56f..97f7ca78ce 100644
+--- a/package/kernel/lantiq/ltq-ifxos/Makefile
++++ b/package/kernel/lantiq/ltq-ifxos/Makefile
+@@ -23,6 +23,7 @@ PKG_LICENSE_FILES:=LICENSE
+ PKG_EXTMOD_SUBDIRS:=src
+ 
+ PKG_FIXUP:=autoreconf
++PKG_BUILD_FLAGS:=no-mold
+ 
+ include $(INCLUDE_DIR)/package.mk
+ 
+diff --git a/package/kernel/lantiq/ltq-vdsl-vr11-mei/Makefile b/package/kernel/lantiq/ltq-vdsl-vr11-mei/Makefile
+index f2dcf8db84..7b8a948179 100644
+--- a/package/kernel/lantiq/ltq-vdsl-vr11-mei/Makefile
++++ b/package/kernel/lantiq/ltq-vdsl-vr11-mei/Makefile
+@@ -25,6 +25,7 @@ PKG_EXTMOD_SUBDIRS:=src
+ 
+ PKG_FIXUP:=autoreconf
+ PKG_FLAGS:=nonshared
++PKG_BUILD_FLAGS:=no-mold
+ 
+ include $(INCLUDE_DIR)/package.mk
+ 
+diff --git a/package/kernel/lantiq/ltq-vdsl-vr11/Makefile b/package/kernel/lantiq/ltq-vdsl-vr11/Makefile
+index 8284cba9a7..11f96d744a 100644
+--- a/package/kernel/lantiq/ltq-vdsl-vr11/Makefile
++++ b/package/kernel/lantiq/ltq-vdsl-vr11/Makefile
+@@ -23,6 +23,7 @@ PKG_LICENSE:=GPL-2.0 BSD-2-Clause
+ PKG_LICENSE_FILES:=LICENSE
+ 
+ PKG_FIXUP:=autoreconf
++PKG_BUILD_FLAGS:=no-mold
+ 
+ include $(INCLUDE_DIR)/package.mk
+ 
+-- 
+2.39.3
+

openwrt/patch/openwrt-6.x/mold/0003-toolchain-add-mold-as-additional-linker.patch

@@ -0,0 +1,58 @@
+From a667acae2ed1d0a99a52e07916b01f42bc9f8f9d Mon Sep 17 00:00:00 2001
+From: Andre Heider <[email protected]>
+Date: Fri, 27 Jan 2023 17:53:02 +0100
+Subject: [PATCH 3/8] toolchain: add mold as additional linker
+
+Install it as $tripple-ld.mold in order to use -fuse-ld=mold.
+
+Signed-off-by: Andre Heider <[email protected]>
+---
+ toolchain/Makefile      |  2 +-
+ toolchain/mold/Makefile | 22 ++++++++++++++++++++++
+ 2 files changed, 23 insertions(+), 1 deletion(-)
+ create mode 100644 toolchain/mold/Makefile
+
+diff --git a/toolchain/Makefile b/toolchain/Makefile
+index c0046293c9..09c16f72a7 100644
+--- a/toolchain/Makefile
++++ b/toolchain/Makefile
+@@ -27,7 +27,7 @@
+ curdir:=toolchain
+ 
+ # subdirectories to descend into
+-$(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),)
+diff --git a/toolchain/mold/Makefile b/toolchain/mold/Makefile
+new file mode 100644
+index 0000000000..a2acba89d3
+--- /dev/null
++++ b/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))
+-- 
+2.39.3
+

openwrt/patch/openwrt-6.x/mold/0004-tools-add-mold-a-modern-linker.patch

@@ -0,0 +1,71 @@
+From a500032a30152630e058c3ee6afbbe787325db43 Mon Sep 17 00:00:00 2001
+From: Andre Heider <[email protected]>
+Date: Fri, 27 Jan 2023 17:53:02 +0100
+Subject: [PATCH 4/8] 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      |  2 ++
+ tools/mold/Makefile | 22 ++++++++++++++++++++++
+ 2 files changed, 24 insertions(+)
+ create mode 100644 tools/mold/Makefile
+
+diff --git a/tools/Makefile b/tools/Makefile
+index 40c3ec1ab0..bf525d34a0 100644
+--- a/tools/Makefile
++++ b/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
+diff --git a/tools/mold/Makefile b/tools/mold/Makefile
+new file mode 100644
+index 0000000000..e8fcecbfed
+--- /dev/null
++++ b/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))
+-- 
+2.39.3
+

openwrt/patch/openwrt-6.x/mold/0005-build-replace-SSTRIP_ARGS-with-SSTRIP_DISCARD_TRAILI.patch

@@ -0,0 +1,63 @@
+From 55d51626b8a3fd48a980e5d033ecdbef071137c4 Mon Sep 17 00:00:00 2001
+From: Andre Heider <[email protected]>
+Date: Sat, 28 Jan 2023 21:16:16 +0100
+Subject: [PATCH 5/8] build: replace SSTRIP_ARGS with
+ SSTRIP_DISCARD_TRAILING_ZEROES
+
+sstrip only has one functional arg. Make that a bool option, which can
+easily depend on other knobs then.
+
+This is required to be disabled for the mold linker.
+
+Signed-off-by: Andre Heider <[email protected]>
+---
+ config/Config-build.in | 10 ++++------
+ rules.mk               |  2 +-
+ 2 files changed, 5 insertions(+), 7 deletions(-)
+
+diff --git a/config/Config-build.in b/config/Config-build.in
+index fe16d81d36..a96ed2f63b 100644
+--- a/config/Config-build.in
++++ b/config/Config-build.in
+@@ -190,7 +190,6 @@ menu "Global build settings"
+ 			help
+ 			  This will install binaries stripped using strip from binutils.
+ 
+-
+ 		config USE_SSTRIP
+ 			bool "sstrip"
+ 			depends on !USE_GLIBC
+@@ -207,13 +206,12 @@ menu "Global build settings"
+ 		help
+ 		  Specifies arguments passed to the strip command when stripping binaries.
+ 
+-	config SSTRIP_ARGS
+-		string
+-		prompt "Sstrip arguments"
++	config SSTRIP_DISCARD_TRAILING_ZEROES
++		bool "Strip trailing zero bytes"
+ 		depends on USE_SSTRIP
+-		default "-z"
++		default y
+ 		help
+-		  Specifies arguments passed to the sstrip command when stripping binaries.
++		  Use sstrip's -z option to discard trailing zero bytes
+ 
+ 	config STRIP_KERNEL_EXPORTS
+ 		bool "Strip unnecessary exports from the kernel image"
+diff --git a/rules.mk b/rules.mk
+index 58c53705a2..c768ccc9b3 100644
+--- a/rules.mk
++++ b/rules.mk
+@@ -325,7 +325,7 @@ else
+     STRIP:=$(TARGET_CROSS)strip $(call qstrip,$(CONFIG_STRIP_ARGS))
+   else
+     ifneq ($(CONFIG_USE_SSTRIP),)
+-      STRIP:=$(STAGING_DIR_HOST)/bin/sstrip $(call qstrip,$(CONFIG_SSTRIP_ARGS))
++      STRIP:=$(STAGING_DIR_HOST)/bin/sstrip $(if $(CONFIG_SSTRIP_DISCARD_TRAILING_ZEROES),-z)
+     endif
+   endif
+   RSTRIP= \
+-- 
+2.39.3
+