编译LoongArch的llvm交叉工具链

OS:Ubuntu 22.04 x86_64

1. 下载llvm 源码

从https://github.com/llvm/llvm-project 下最新的release 版本，这里下载的是llvm17.0.0-rc4

2.编译

解压源码后，在源码目录执行编译脚本 build.sh

$ cat build.sh

#!/bin/bash
set -e
set -x

CONFIG_AND_BUILD=true

INSTALL_DIR="$PWD/llvm_install"

while $CONFIG_AND_BUILD ; do
  rm -rf _build
  mkdir _build
  break
done

cd _build

while $CONFIG_AND_BUILD; do

  #cmake --log-level=VERBOSE --debug-output \
  cmake \
    -DCMAKE_VERBOSE_MAKEFILE=ON \
    -DCMAKE_BUILD_TYPE="Release" \
    -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR" \
    \
       ../llvm -G Ninja \
    \
    -DLLVM_TARGETS_TO_BUILD="all" \
    -DLLVM_ENABLE_PROJECTS="clang;lld;compiler-rt" \
    -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
    \
    -DLLVM_INSTALL_UTILS=ON \
    -DLLVM_INSTALL_TOOLCHAIN_ONLY=OFF \
    -DBUILD_SHARED_LIBS=OFF \
    \
    -DLLVM_INCLUDE_TOOLS=ON \
    -DLLVM_BUILD_TOOLS=ON \
    \
    -DLLVM_INCLUDE_UTILS=ON \
    -DLLVM_BUILD_UTILS=ON \
    \
    -DLLVM_INCLUDE_RUNTIMES=ON \
    -DLLVM_BUILD_RUNTIME=ON \
    \
    -DLLVM_INCLUDE_EXAMPLES=ON \
    -DLLVM_BUILD_EXAMPLES=OFF \
    \
    -DLLVM_INCLUDE_TESTS=ON \
    -DLLVM_BUILD_TESTS=OFF \
    \
    -DLLVM_INCLUDE_DOCS=ON \
    -DLLVM_BUILD_DOCS=OFF \
    -DLLVM_ENABLE_DOXYGEN=OFF \
    -DLLVM_ENABLE_SPHINX=OFF \
    -DLLVM_ENABLE_OCAMLDOC=OFF \
    -DLLVM_ENABLE_BINDINGS=OFF \
    \
    -DLLVM_BUILD_LLVM_DYLIB=ON \
    -DLLVM_LINK_LLVM_DYLIB=ON \
    \
    -DLLVM_ENABLE_LIBCXX=OFF \
    -DLLVM_ENABLE_ZLIB=ON \
    -DLLVM_ENABLE_FFI=ON \
    -DLLVM_ENABLE_RTTI=ON \
    -DCOMPILER_RT_BUILD_LIBRUZZER=OFF

  break
done

ninja -v -j6

ninja -v install

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2.1 交叉编译

下载gcc交叉工具链https://github.com/sunhaiyong1978/CLFS-for-LoongArch/releases/download/8.1/CLFS-loongarch64-8.1.1-x86_64-cross-tools-gcc-libc.tar.xz，并解压到/opt

执行交叉编译脚本 cross_build.sh

$ cat cross_build.sh

#!/bin/bash
set -e
set -x

CONFIG_AND_BUILD=true
#CONFIG_AND_BUILD=false

CONFIG_DIR="$PWD/llvm_install/bin"
LA_TOOLCHAIN=/opt/cross-tools/loongarch64-unknown-linux-gnu
LA_FLAGS="-B$LA_TOOLCHAIN"

while $CONFIG_AND_BUILD ; do
  rm -rf _build_cross
  mkdir _build_cross
  break
done

cd _build_cross

while $CONFIG_AND_BUILD; do

  cmake \
    -DCMAKE_CROSSCOMPILING=True \
    -DLLVM_CONFIG_PATH=$CONFIG_DIR/llvm-config \
    -DCMAKE_C_COMPILER=/opt/cross-tools/bin/loongarch64-unknown-linux-gnu-gcc \
    -DCMAKE_CXX_COMPILER=/opt/cross-tools/bin/loongarch64-unknown-linux-gnu-g++ \
    -DCMAKE_SYSROOT="/opt/cross-tools/target"  \
    -DCMAKE_VERBOSE_MAKEFILE=ON \
    -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \
    -DCMAKE_C_COMPILER_TARGET="loongarch64" \
    -DCMAKE_CXX_COMPILER_TARGET="loongarch64" \
    -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
    -DCMAKE_C_FLAGS="$LA_FLAGS" \
    -DCMAKE_BUILD_TYPE="Release" \
    -DCMAKE_INSTALL_PREFIX="`$CONFIG_DIR/clang -print-resource-dir`" \
    \
       ../compiler-rt -G Ninja

  break
done

ninja -v -j6

ninja -v install

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编译完成之后会安装到当前目录下的 llvm_install 目录。

$ cd llvm_install/bin
$ ./llc -version
LLVM (http://llvm.org/):
  LLVM version 17.0.0rc
  Optimized build.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: haswell

  Registered Targets:
    aarch64     - AArch64 (little endian)
    aarch64_32  - AArch64 (little endian ILP32)
    aarch64_be  - AArch64 (big endian)
    amdgcn      - AMD GCN GPUs
    arm         - ARM
    arm64       - ARM64 (little endian)
    arm64_32    - ARM64 (little endian ILP32)
    armeb       - ARM (big endian)
    avr         - Atmel AVR Microcontroller
    bpf         - BPF (host endian)
    bpfeb       - BPF (big endian)
    bpfel       - BPF (little endian)
    hexagon     - Hexagon
    lanai       - Lanai
    loongarch32 - 32-bit LoongArch
    loongarch64 - 64-bit LoongArch
    mips        - MIPS (32-bit big endian)
    mips64      - MIPS (64-bit big endian)
    mips64el    - MIPS (64-bit little endian)
    mipsel      - MIPS (32-bit little endian)
    msp430      - MSP430 [experimental]
    nvptx       - NVIDIA PTX 32-bit
    nvptx64     - NVIDIA PTX 64-bit
    ppc32       - PowerPC 32
    ppc32le     - PowerPC 32 LE
    ppc64       - PowerPC 64
    ppc64le     - PowerPC 64 LE
    r600        - AMD GPUs HD2XXX-HD6XXX
    riscv32     - 32-bit RISC-V
    riscv64     - 64-bit RISC-V
    sparc       - Sparc
    sparcel     - Sparc LE
    sparcv9     - Sparc V9
    systemz     - SystemZ
    thumb       - Thumb
    thumbeb     - Thumb (big endian)
    ve          - VE
    wasm32      - WebAssembly 32-bit
    wasm64      - WebAssembly 64-bit
    x86         - 32-bit X86: Pentium-Pro and above
    x86-64      - 64-bit X86: EM64T and AMD64
    xcore       - XCore
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