OSDT Weekly 第107期

近期活动

• 上周日的 OSDT Meetup 视频回放已经公开了，欢迎收藏和观看： https://www.bilibili.com/video/BV1154y1E7CN

• 更新了：《零基础入门 RISC-V GCC 编译器开发 暨 编译技术入门与实战第四季》更新了第二课：GCC中的抽象语法树生成 https://www.bilibili.com/video/BV1kU4y137Ba?p=2

编译社区的八卦信息

GCC

• FYI/RFC: strub: machine-independent stack scrubbing https://gcc.gnu.org/pipermail/gcc/2021-July/236780.html

• [PATCH 2/2][RFC] Add loop masking support for x86 https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575291.html

• [PATCH v2 0/6] rs6000: Add SSE4.1 "blend", "ceil", "floor" https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575445.html

• Question about PIC code and GOT https://gcc.gnu.org/pipermail/gcc/2021-July/236833.html

• [PATCH 0/2] Allow means for targets to opt out of CTF/BTF https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575510.html

• [RFC/PATCH] Use range-based for loops for traversing loops https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575536.html

• [Questions] Is there any bit in gimple/rtl to indicate this IR support fast-math or not? https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575148.html

• [PATCH] Rewrite memset expanders with vec_duplicate https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575129.html

Binutils/GDB

• [PATCH v2 0/3] RISC-V: The series to supporting mapping symbols https://sourceware.org/pipermail/binutils/2021-July/117313.html

• GDB: [PATCH 0/1] Improve CSKY arch support https://sourceware.org/pipermail/gdb-patches/2021-July/180963.html

• GDB 11.1 release prep update (2021-07-17) https://sourceware.org/pipermail/gdb-patches/2021-July/181004.html

• [PATCH 0/2] Fix detach with target remote (PR gdb/28080) https://sourceware.org/pipermail/gdb-patches/2021-July/180847.html

• [PATCH v3 0/2] Fix gdb.base/sigstep.exp for riscv64-linux https://sourceware.org/pipermail/gdb-patches/2021-July/180740.html

GLIBC

• glibc 2.34 - Hard ABI freeze effective immediately. https://sourceware.org/pipermail/libc-alpha/2021-July/129201.html

• [PATCH] Add optional _Float16 support https://sourceware.org/pipermail/libc-alpha/2021-July/128335.html

• Buildbot improvements https://sourceware.org/pipermail/libc-alpha/2021-July/129008.html

• [PATCH v2 0/6] Some rtld-audit fixes https://sourceware.org/pipermail/libc-alpha/2021-July/129239.html

• [PATCH v10 00/11] malloc hooks removal https://sourceware.org/pipermail/libc-alpha/2021-July/129271.html

• [PATCH] c++: implement C++17 hardware interference size https://sourceware.org/pipermail/libc-alpha/2021-July/129156.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第394期， Alex Bradbury 大哥持续稳定输出。

• Amir Aupov posted an update on the BOLT framework, which has now been rebased on top of a much more recent LLVM. The post gives a detailed list of next steps and patches that are in the process of being upstreamed.

• The RegAlloc interface was modified to allow targets to split register allocation between different register classes (controlled by a callback function). The initial motivation is to allow AMDGPU to split allocation for SGPRs and VGPRs. eebe841.

• Register definitions and initial MC layer support support was added for the Armv9-A Scalable Matrix Extension. c08dabb, dfa7693, 99eb96f.

• The language reference was updated to clarify semantics of inttoptr/ptrtoint for non-integral types. f74bb95.

• The Arm backend gained new MVESEXT and MVEZEXT nodes that larger-than-legal sext and zext are lowered to when MVE is enabled. ca78151.

RISC-V in China

• 第一节 RISC-V 中国峰会的主会演讲视频已经上传到了B站： https://space.bilibili.com/1121469705

RT-Thread 社区

• 睿赛德科技产学合作协同育人项目开始申报啦

• 【AI简报20210716期】上海张江又一款AI芯发布、寒武纪切入自动驾驶芯片

• RT-Thread的课程教学内容梳理及资源介绍分享交流会 (https://mp.weixin.qq.com/s/O_C8sST-lLFYCcL6JixU8A)，特别邀请到了苏州大学王宜怀教授分享实时操作系统课程教学脉络 、教学重点及难点介绍以及实践操作演示

• 解决at_socket在极限情况下内存泄漏问题 https://github.com/RT-Thread/rt-thread/pull/4868

本周工具链岗位

往期社招及实习生招聘长期有效。

• PLCT实验室为你新开放了一个技术岗位：来一起变得更强吧！
• 【实习生招聘】开源RISC-V软件，超朴素的招募文章
• 笑死，一个实习生都没有就敢开始做 openEuler RISC-V 的移植

本周推荐阅读

本周推荐：《关键改变》

推荐人：小编1号

这本书是跟《关键冲突》、《关键对话》是同一个作者团队。在理论框架上是采用了同样的【动机x能力】x【个人、环境、结构】的模型；在具体做法上又跟《掌控习惯（Atomic Habits）》有类似的指导过程。总体而言，书看多了之后，能够看到共同的模型出来。

当一个人真的想去改变什么，以达到自己的目标的时候，《关键改变》这本书中的方法是有用的，在各个细节的地方确保了周围都在把你往前推，而不是往后拉。小编1号有着类似的改进的经验和自我总结，跟《关键改变》中总结的技巧有大量相似的地方（所谓的「著书长恨古人多」）。总体而言，是靠谱的。相比起来，《掌控习惯》更多的依赖于个人的自我暗示和自律，对于社会网络和他人的帮助并没有《关键改变》说得清晰和明确。可以两本书重叠起来看和执行。

当然，你依然需要一个强烈的动机才可以开始。