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[components][libc] cplusplus_system_init 补上 .init_array 的构造函数 - #11856

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[components][libc] cplusplus_system_init 补上 .init_array 的构造函数#11856
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@cms19859230182-lang cms19859230182-lang commented Oct 8, 2026 •
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拉取/合并请求描述：(PR description)

为什么提交这份PR (why to submit this PR)

Newer GCC puts C++ global constructors into .init_array instead of the
__ctors_start__/__ctors_end__ range, so cplusplus_system_init() missed
them on ports whose linker script does not merge .init_array into the ctors
range. Fixes #11778

你的解决方案是什么 (what is your solution)

Walk __init_array_start/__init_array_end as well. Both ranges are declared
weak, and each .init_array entry that already lies inside the ctors range is
skipped, so full or partial overlap never runs a constructor twice.

Add the Kconfig option RT_USING_CPP_CRT_INIT for ports whose startup
runtime already calls constructors (default on for the simulator, where glibc
runs .init_array before main).

请提供验证的bsp和config (provide the config and bsp)

  • BSP: bsp/simulator

  • .config: CONFIG_RT_USING_CPLUSPLUS=y, CONFIG_RT_USING_CPP_CRT_INIT=y

    A global constructor runs exactly once. A host test also covers the ctors
    and init_array range combinations.

  • action: CI link will be added once checks finish.

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

  • 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
  • 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

  • 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
  • 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
  • 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
  • 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
  • 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
  • 代码是高质量的 Code in this PR is of high quality
  • 已经使用clang-format 源码格式化工具确保格式符合RT-Thread代码规范 This PR has been formatted with clang-format and complies with RT-Thread code specification
  • 如果是新增bsp, 已经添加ci检查到.github/ALL_BSP_COMPILE.json 详细请参考链接BSP自查

@github-actions

github-actions Bot commented Oct 8, 2026

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👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
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  • 在 branch 输入框填写 PR 分支 fix-11778-init-array
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完成后，提交将自动更新至 fix-11778-init-array 分支，关联的 Pull Request 也会同步更新。
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如有问题欢迎联系我们，再次感谢您的贡献！💐
If you have any questions, feel free to reach out. Thanks again for your contribution!

@github-actions

github-actions Bot commented Oct 8, 2026 •
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📌 Code Review Assignment

🏷️ Tag: components

Reviewers: @Maihuanyi

Changed Files (Click to expand)
  • components/libc/cplusplus/Kconfig
  • components/libc/cplusplus/cxx_crt_init.c

🏷️ Tag: components_libc

Reviewers: @GorrayLi @mysterywolf

Changed Files (Click to expand)
  • components/libc/cplusplus/Kconfig
  • components/libc/cplusplus/cxx_crt_init.c

📊 Current Review Status (Last Updated: 2026-10-09 23:13 CST)

📝 Review Instructions

  1. 维护者可以通过单击此处来刷新审查状态: 🔄 刷新状态
    Maintainers can refresh the review status by clicking here: 🔄 Refresh Status

  2. 确认审核通过后评论 LGTM/lgtm
    Comment LGTM/lgtm after confirming approval

  3. PR合并前需至少一位维护者确认
    PR must be confirmed by at least one maintainer before merging

ℹ️ 刷新CI状态操作需要具备仓库写入权限。
ℹ️ Refresh CI status operation requires repository Write permission.

@github-actions

github-actions Bot commented Oct 8, 2026 •
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MemBrowse Memory Report

No memory changes detected for:

@cms19859230182-lang
[components][libc] run .init_array constructors in cplusplus_system_init
5dd7cfa 
Newer GCC emits C++ global constructors into .init_array, which many
linker scripts keep outside [__ctors_start__, __ctors_end__), so they
never ran. Walk __init_array_start/__init_array_end (weak) as well,
skipping entries already covered by the ctors range.

Add RT_USING_CPP_CRT_INIT for ports whose startup runtime already runs
constructors, default on for the simulator, to avoid running them twice.

Fixes RT-Thread#11778

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@mysterywolf mysterywolf Awaiting requested review from mysterywolf mysterywolf is a code owner

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[Bug] 很多bsp对c++的自动构造函数支持有问题

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