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Toolchain: Add support for building the userland with the mold linker
This commit adds support for building the SerenityOS userland with the new [mold linker]. This is not enabled by default yet; to link using mold, run the `Toolchain/BuildMold.sh` script to build the latest release of mold, and set the `ENABLE_MOLD_LINKER` CMake variable to ON. This option relies on toolchain support that has been added just recently, so you might need to rebuild your toolchain for mold to work. [mold linker]: https://github.com/rui314/mold
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Notes:
sideshowbarker
2024-07-17 20:19:01 +09:00
Author: https://github.com/BertalanD Commit: https://github.com/SerenityOS/serenity/commit/4055c393fc9 Pull-request: https://github.com/SerenityOS/serenity/pull/12049 Reviewed-by: https://github.com/ADKaster Reviewed-by: https://github.com/IdanHo Reviewed-by: https://github.com/alimpfard Reviewed-by: https://github.com/bgianfo ✅ Reviewed-by: https://github.com/linusg ✅
@ -267,6 +267,9 @@ endif()
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add_subdirectory(AK)
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add_subdirectory(AK)
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add_subdirectory(Kernel)
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add_subdirectory(Kernel)
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if(NOT "${SERENITY_ARCH}" STREQUAL "aarch64")
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if(NOT "${SERENITY_ARCH}" STREQUAL "aarch64")
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if (ENABLE_MOLD_LINKER)
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add_link_options(-fuse-ld=mold)
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endif()
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add_subdirectory(Userland)
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add_subdirectory(Userland)
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add_subdirectory(Tests)
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add_subdirectory(Tests)
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endif()
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endif()
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@ -53,6 +53,7 @@ There are some optional features that can be enabled during compilation that are
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- `ENABLE_PCI_IDS_DOWNLOAD`: downloads the [`pci.ids` database](https://pci-ids.ucw.cz/) that contains information about PCI devices at build time, if not already present. Enabled by default.
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- `ENABLE_PCI_IDS_DOWNLOAD`: downloads the [`pci.ids` database](https://pci-ids.ucw.cz/) that contains information about PCI devices at build time, if not already present. Enabled by default.
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- `BUILD_LAGOM`: builds [Lagom](../Meta/Lagom/ReadMe.md), which makes various SerenityOS libraries and programs available on the host system.
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- `BUILD_LAGOM`: builds [Lagom](../Meta/Lagom/ReadMe.md), which makes various SerenityOS libraries and programs available on the host system.
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- `ENABLE_KERNEL_LTO`: builds the kernel with link-time optimization.
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- `ENABLE_KERNEL_LTO`: builds the kernel with link-time optimization.
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- `ENABLE_MOLD_LINKER`: builds the userland with the [`mold` linker](https://github.com/rui314/mold). `mold` can be built by running `Toolchain/BuildMold.sh`.
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- `INCLUDE_WASM_SPEC_TESTS`: downloads and includes the WebAssembly spec testsuite tests. In order to use this option, you will need to install `prettier` and `wabt`. wabt version 1.0.23 or higher is required to pre-process the WebAssembly spec testsuite.
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- `INCLUDE_WASM_SPEC_TESTS`: downloads and includes the WebAssembly spec testsuite tests. In order to use this option, you will need to install `prettier` and `wabt`. wabt version 1.0.23 or higher is required to pre-process the WebAssembly spec testsuite.
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- `SERENITY_TOOLCHAIN`: Specifies whether to use the established GNU toolchain, or the experimental Clang-based toolchain for building SerenityOS. See the [Clang-based toolchain](#clang-based-toolchain) section below.
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- `SERENITY_TOOLCHAIN`: Specifies whether to use the established GNU toolchain, or the experimental Clang-based toolchain for building SerenityOS. See the [Clang-based toolchain](#clang-based-toolchain) section below.
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- `SERENITY_ARCH`: Specifies which architecture to build for. Currently supported options are `i686` and `x86_64`. `x86_64` requires a separate toolchain build from `i686`.
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- `SERENITY_ARCH`: Specifies which architecture to build for. Currently supported options are `i686` and `x86_64`. `x86_64` requires a separate toolchain build from `i686`.
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@ -11,3 +11,4 @@ serenity_option(ENABLE_KERNEL_ADDRESS_SANITIZER OFF CACHE BOOL "Enable kernel ad
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serenity_option(ENABLE_KERNEL_COVERAGE_COLLECTION OFF CACHE BOOL "Enable KCOV and kernel coverage instrumentation in gcc/clang")
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serenity_option(ENABLE_KERNEL_COVERAGE_COLLECTION OFF CACHE BOOL "Enable KCOV and kernel coverage instrumentation in gcc/clang")
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serenity_option(ENABLE_KERNEL_LTO OFF CACHE BOOL "Build the kernel with link-time optimization")
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serenity_option(ENABLE_KERNEL_LTO OFF CACHE BOOL "Build the kernel with link-time optimization")
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serenity_option(ENABLE_EXTRA_KERNEL_DEBUG_SYMBOLS OFF CACHE BOOL "Enable -Og and -ggdb3 options for Kernel code for easier debugging")
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serenity_option(ENABLE_EXTRA_KERNEL_DEBUG_SYMBOLS OFF CACHE BOOL "Enable -Og and -ggdb3 options for Kernel code for easier debugging")
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serenity_option(ENABLE_MOLD_LINKER OFF CACHE BOOL "Link the SerenityOS userland with the mold linker")
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@ -57,7 +57,9 @@ function(serenity_libc target_name fs_name)
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target_link_libraries(${target_name} clang_rt.builtins)
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target_link_libraries(${target_name} clang_rt.builtins)
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# FIXME: Implement -static-libstdc++ in the next toolchain update.
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# FIXME: Implement -static-libstdc++ in the next toolchain update.
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target_link_options(${target_name} PRIVATE -nostdlib++ -Wl,-Bstatic -lc++ -Wl,-Bdynamic)
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target_link_options(${target_name} PRIVATE -nostdlib++ -Wl,-Bstatic -lc++ -Wl,-Bdynamic)
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target_link_options(${target_name} PRIVATE -Wl,--no-dependent-libraries)
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if (NOT ENABLE_MOLD_LINKER)
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target_link_options(${target_name} PRIVATE -Wl,--no-dependent-libraries)
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endif()
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endif()
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endif()
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target_link_directories(LibC PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
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target_link_directories(LibC PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
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serenity_generated_sources(${target_name})
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serenity_generated_sources(${target_name})
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@ -294,6 +294,10 @@ pushd "$DIR/Build/clang"
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done
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done
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popd
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popd
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pushd "$DIR/Local/clang/bin/"
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buildstep "mold_symlink" ln -s ../../mold/bin/mold ld.mold
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popd
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# === SAVE TO CACHE ===
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# === SAVE TO CACHE ===
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pushd "$DIR"
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pushd "$DIR"
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@ -399,6 +399,10 @@ pushd "$DIR/Build/$ARCH"
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popd
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popd
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pushd "$DIR/Local/$ARCH/$ARCH-pc-serenity/bin"
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buildstep "mold_symlink" ln -s ../../../mold/bin/mold ld.mold
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popd
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# == SAVE TO CACHE ==
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# == SAVE TO CACHE ==
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44
Toolchain/BuildMold.sh
Executable file
44
Toolchain/BuildMold.sh
Executable file
@ -0,0 +1,44 @@
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#!/usr/bin/env bash
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# This script builds the mold linker that can optionally be used for linking
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# the SerenityOS userland.
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set -e
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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NPROC="nproc"
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SYSTEM_NAME="$(uname -s)"
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if [ "$SYSTEM_NAME" = "OpenBSD" ]; then
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NPROC="sysctl -n hw.ncpuonline"
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elif [ "$SYSTEM_NAME" = "FreeBSD" ]; then
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NPROC="sysctl -n hw.ncpu"
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elif [ "$SYSTEM_NAME" = "Darwin" ]; then
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NPROC="sysctl -n hw.ncpu"
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fi
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[ -z "$MAKEJOBS" ] && MAKEJOBS=$($NPROC)
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mkdir -p "$DIR"/Tarballs
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pushd "$DIR"/Tarballs
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if [ "$1" = "--git" ]; then
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[ ! -d mold ] && git clone https://github.com/rui314/mold.git
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cd mold
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git pull
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else
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VERSION=1.0.2
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[ ! -e mold-$VERSION.tar.gz ] && curl -L "https://github.com/rui314/mold/archive/refs/tags/v$VERSION.tar.gz" -o mold-$VERSION.tar.gz
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[ ! -e mold-$VERSION ] && tar -xzf mold-$VERSION.tar.gz
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cd mold-$VERSION
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fi
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make clean
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export DESTDIR="$DIR"/Local/mold
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export PREFIX=
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make -j "$MAKEJOBS"
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make install
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popd
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