# llvm-toolchains

**Repository Path**: riscv-sig/llvm-toolchains

## Basic Information

- **Project Name**: llvm-toolchains
- **Description**: riscv64架构去除eflags检查的工具链
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: weekly_20230905
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 3
- **Created**: 2023-10-27
- **Last Updated**: 2025-09-09

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# llvm15-riscv64工具链介绍

## 1、工具链代码下载

```shell
repo init -u https://gitee.com/OpenHarmony/manifest.git -b master -m llvm-toolchain.xml
repo sync -c 
repo forall -c 'git lfs pull'
repo start master --all
```

## 2、环境配置

```
bash ./toolchain/llvm-project/llvm-build/env_prepare.sh
```

## 3、工具链代码修改

打开文件`toolchain/llvm-project/lld/ELF/Arch/RISCV.cpp`文件，然后将141-148行注释掉，如下所示

```shell
uint32_t RISCV::calcEFlags() const {
  // If there are only binary input files (from -b binary), use a
  // value of 0 for the ELF header flags.
  if (ctx->objectFiles.empty())
    return 0;

  uint32_t target = getEFlags(ctx->objectFiles.front());

  for (InputFile *f : ctx->objectFiles) {
    uint32_t eflags = getEFlags(f);
    if (eflags & EF_RISCV_RVC)
      target |= EF_RISCV_RVC;

    /*
    if ((eflags & EF_RISCV_FLOAT_ABI) != (target & EF_RISCV_FLOAT_ABI))
      error(toString(f) +
            ": cannot link object files with different floating-point ABI");

    if ((eflags & EF_RISCV_RVE) != (target & EF_RISCV_RVE))
      error(toString(f) +
            ": cannot link object files with different EF_RISCV_RVE");
    */
  }

  return target;
}

```

## 4、`clang15.0.4`版本不编译`windows`平台

```shell
python3 ./toolchain/llvm-project/llvm-build/build.py --no-build windows
```

## 5、获取工具链

编译生成的工具链在`out/install/linux-x86_64/clang-dev`里面