[parthitce]

为什么提交这份PR (why to submit this PR)

With picolibc, ctime.c gives -Warray-parameter and -Wnonnull-compare warnings, so builds with --strict fail.

你的解决方案是什么 (what is your solution)

picolibc declares the buffer of asctime_r/ctime_r as char[static 26]. Use the same form only for picolibc and drop the NULL check there. Other C libraries are unchanged.

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

• BSP: bsp/qemu-vexpress-a9 (newlib, musl), bsp/stm32/stm32f407-rt-spark (newlib), RH850 qemu-rh850-u2c (picolibc)

• .config: default

• action: YTD

[CLAassistant]

All committers have signed the CLA.

[github-actions]

👋 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）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

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🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page
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• Use workflow from 保持默认分支（通常为 master）
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• 在 branch 输入框填写 PR 分支 rh850/fix-ctime-picolibc
  Enter PR branch rh850/fix-ctime-picolibc in the branch field
• 设置需排除的文件/目录（目录请以"/"结尾）
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完成后，提交将自动更新至 rh850/fix-ctime-picolibc 分支，关联的 Pull Request 也会同步更新。
Once completed, commits will be pushed to the rh850/fix-ctime-picolibc branch automatically, and the related Pull Request will be updated.

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]

📌 Code Review Assignment

🏷️ Tag: components

Reviewers: @Maihuanyi

Changed Files (Click to expand)

• components/libc/compilers/common/ctime.c

🏷️ Tag: components_libc

Reviewers: @GorrayLi @mysterywolf

Changed Files (Click to expand)

• components/libc/compilers/common/ctime.c

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📊 Current Review Status (Last Updated: 2026-11-07 04:43 CST)

• ⌛ @GorrayLi Pending Review
• ⌛ @Maihuanyi Pending Review
• ⌛ @mysterywolf Pending Review

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📝 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
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3. PR合并前需至少一位维护者确认
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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]

MemBrowse Memory Report · Explore what changed →

No memory changes detected for:

• at32f415-start
• esp32-c3
• gd32105r-start
• hc32f334
• hpmicro-hpm5100evk
• hpmicro-hpm5301evklite
• infineon-psoc6
• k230
• loongson-ls1cdev
• nordic-nrf51822
• nuvoton-m487
• nxp-lpc1114
• qemu-virt64-aarch64
• raspberry-pico-rp2040
• renesas-ra2l1
• simulator
• stm32f407-rt-spark
• stm32l475-atk-pandora-llvm
• wch-ch32v208w-r0
• x86
• xuantie-e901plus

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_{Catch memory regressions in CI with MemBrowse. Free for open source.}

[BernardXiong]

复核 head bb439460：CLA 已签署，CI 全部通过（106 pass）。picolibc 分支用 __restrict_arr __min_size(__ASCTIME_SIZE) 匹配 asctime_r / ctime_r 的原型，非 picolibc 分支保持原有 char * 签名不变；_ASCTIME_BUF_NULL() 在 picolibc 下返回 0，避免对非空指针做多余的 NULL 比较。未发现阻塞问题。

Reviewed head bb439460: CLA is signed and all checks pass (106 pass). The picolibc branch matches the asctime_r / ctime_r prototypes with __restrict_arr __min_size(__ASCTIME_SIZE), while the non-picolibc branch keeps the original char * signature. _ASCTIME_BUF_NULL() returning 0 under picolibc correctly avoids a redundant NULL comparison. No blocking issues found.