Gentoo Google Summer of Code (GSoC) for 2023

Gentoo is excited to announce that the Gentoo Google Summer of Code has accepted a group of talented contributors to participate in this year’s program. We extend our congratulations and welcome them aboard!

Google Summer of Code is a global program that provides a unique opportunity for students and young professionals to work on open-source projects under the guidance of experienced mentors.

We received a high volume of impressive applications from individuals around the world, each demonstrating their passion and skills for open-source projects. The selection process was challenging, but we are pleased to have accepted the following four contributors:

  • Alfred Persson Forsberg – IRC Handle: catcream
  • Berin Aniesh – IRC Handle: hyperedge
  • Stepan Kulikov – IRC Handle: labbrat
  • Brahmajit Das – IRC Handle: listout

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Refining ROCm Packages in Gentoo — project summary

12 weeks quickly slips away, and I’m proud to say that the packaging quality of ROCm in Gentoo does gets improved in this project.

Two sets of major deliverables are achieved: New ebuilds of ROCm-5.1.3 tool-chain that purely depends on vanilla llvm/clang, and rocm.eclass along with ROCm-5.1.3 libraries utilizing them. Each brings one great QA improvement compare to the original ROCm packaging method.

Beyond these, I also maintained rocprofiler, rocm-opencl-runtimes, bumping their version with nontrivial changes. I discovered several bugs, and talked to upstream. I also wrote ROCm wiki pages, which starts my journey on Gentoo wiki.

By writing rocm.eclass, I learnt pretty much about eclass writing — how to design, how to balance needs and QA concerns, how to write comments and examples well, etc. I’m really grateful to those Gentoo developers who pointed out my mistakes and helped me polishing my eclass.

Since I’m working on top of Gentoo repo, my work is scattered around rather than having my own repo. My major products can be seen in [0], where all my PRs to ::gentoo located. My weekly report can be found on Gentoo GSoC blogs

[0] My finished PRs for gentoo during GSoC 2022

Details are as followed:

First, it’s about ROCm on vanilla llvm/clang

Originally, ROCm has its own llvm fork, which has some modifications not upstreamed yet. In the original Gentoo ROCm packaging roadmap, sys-devel/llvm-roc is introduced as the ROCm forked llvm/clang. This is the simple way, and worked well on ROCm-only packages [1]. But it brings troubles if a large project like blender pulls in dependencies using vanilla llvm, and results in symbol collision [2].

So, when I noticed [1] in week 1, I began my journey on porting ROCm on vanilla clang. I’m very lucky, because at that time clang-14.0.5 was just released, eliminating major obstacles for porting (previous versions more or less have bugs). After some quick hack I succeeded, which is recorded in the week 1 report [3]. In that week I successfully built blender with hip cycles (GPU-accelerated render code written in HIP), and rendered some example projects on a Radeon RX 6700XT.

While I was thrilled in porting ROCm tool-chain upon vanilla clang, my mentor pointed out that I have carelessly brought some serious bugs in ::gentoo. In week 2, I managed to fix bugs I created, and set up a reproducible test ground using docker, to make test more easy and clean and avoid such bugs from happening again. Details can be found in week 2’s report [4].

After that there weren’t non-trivial progresses in porting to vanilla clang, only bug fixes and ebuild polishing, until I met MIOpen in the last week.

The story of debugging MIOpen assemblies

In week 12 rocm.eclass is almost in its final shape, so I began to land ROCm libraries [1] including sci-libs/miopen. ROCm libraries are usually written in “high level” languages like HIP, while dev-util/hip is already ported to use vanilla clang in good shape, so there is no need to worry compilation problems. However, MIOpen have various hand-written assemblies for JIT, which causes several test failures [5]. It was frustrating because I’m unfamiliar with AMDGPU assemblies, so I was close to gave up (my mentor also suggest to give up working on it in GSoC). Thus, I reported my problem to upstream in [5], attached with my debugging attempts.

Thanks to my testing system mentioned previously, I have setup not only standard environments, but also one snapshot with full llvm/clang debug symbols. I quickly located the problem and reported to upstream via issue, but I still didn’t know why the error is happening.

In the second day, I decided to look at the assembly and debugging result once again. This time fortune is on my side, and I discovered the key issue is LLVM treating Y and N in metadata as boolean values, not strings (they should be kernel parameter names) [6]. I provided a fix in [7], and all tests passed on both Radeon VII and Radeon RX 6700XT. Amazing! I have also mentioned how excited I was in week 12’s report [8].

[1] For example, ROCm libraries in https://github.com/ROCmSoftwarePlatform
[2] https://bugs.gentoo.org/693200
[3] Week 1 Report for Refining ROCm Packages in Gentoo
[4] Week 4 Report for Refining ROCm Packages in Gentoo
[5] https://github.com/ROCmSoftwarePlatform/MIOpen/issues/1731
[6] https://github.com/ROCmSoftwarePlatform/MIOpen/issues/1731#issuecomment-1236913096
[7] https://github.com/littlewu2508/gentoo/commit/40eb81f151f43eb5d833dc7440b02f12dab04b89
[8] Week 12 Report for Refining ROCm Packages in Gentoo

The second deliverable is rocm.eclass

The most challenging part for me, is to write rocm.eclass. I started writing it in week 4 [9], and finished my design in week 8 [10] (including 10 days of temporary leave). In week 9-12, I posted 7 revisions of rocm.eclass in gentoo-dev mailing list [10,11], and received many helpful comments. Also, on Github PR [12], I also got lots of suggestions from Gentoo developers.

Eventually, I finished rocm.eclass, providing amdgpu_targets USE_EXPAND, ROCM_REQUIRED_USE, and ROCM_USE_DEP to control which gpu targets to compile, and coherency among dependencies. The eclass provides get_amdgpu_flags for src_configure and check_amdgpu for ensuring AMDGPU device accessibility in src_test. Finally, rocm.eclass is merged into ::gentoo in [13].

[9] Week 9 Report for Refining ROCm Packages in Gentoo
[10] https://archives.gentoo.org/gentoo-dev/threads/2022-08/
[11] https://archives.gentoo.org/gentoo-dev/threads/2022-09/
[12] https://github.com/gentoo/gentoo/pull/26784
[13] https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=cf8a6a845b68b578772f2ae0d2703f203c6dec33

Other coding products

Merged ebuilds

rocprofiler

I have bumped dev-util/rocprofiler and its dependencies to version 5.1.3, and fixed proprietary aql profiler lib loading, so ROCm stack on Gentoo stays fully open-sourced without losing most profiling functionalities [14].

[14] https://github.com/ROCm-Developer-Tools/rocprofiler/issues/38

Unmerged ebuilds

Due to limited time and long testing period, ebuilds of ROCm-5.1.3 libraries (ones using rocm.eclass) does not get merged. They can be found in this PR.
dev-libs/rocm-opencl-runtime is a critical package because it provides opencl, and many users still use opencl for GPGPU since HIP is a new stuff. I bumped it to 5.1.3 to match the vanilla clang tool-chain, and enabled its src_test, so users can make sure that vanilla clang isn’t breaking anything. The PR is located here.

Bug fixes

Existing bug fixing is also a part of my GSoC. I have created various PRs and closed corresponding bugs on Gentoo Bugzilla: #822828, #853718, #851795, #851792, #852236, #850937, #836248, #836274, #866839. Also, many bug fixing happens before new packages enter the gentoo main repo, or they are found by myself in the first place, so there is no record on Bugzilla.

Last but not least, the wiki page

I have created 3 pages [15-17], filling important information about ROCm. I also received a lot of help from the Gentoo community, mainly focused on refining my wiki to meet the standards.

[15] https://wiki.gentoo.org/wiki/ROCm
[16] https://wiki.gentoo.org/wiki/HIP
[17] https://wiki.gentoo.org/wiki/Rocprofiler

Comparison with original plan

The original plan in proposal also contained rocm.eclass. But it only allocated the last week for “investigation on vanilla clang”. In week 1, my mentor and I added “porting ROCm on vanilla clang” to the plan, and this became the new major deliverable. Due to the time limit, packaging high level frameworks like pytorch and tensorflow is abandoned. I only worked to get CuPy worked [18], showing rocm.eclass functionality on packages that depend on ROCm libraries.

I think the change of plan and deliverables better annotated the project title “Refining”, because what I did greatly improves the quality of existing ebuilds, rather than introducing more ebuilds.

[18] https://github.com/littlewu2508/gentoo/commit/3d142fa4b4ada560c053c2fd3c8c1501c82aace2

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Week 12 Report for Refining ROCm Packages in Gentoo

Although this is the final week, I would like to say that it is as exciting as the first week.

I kept polishing rocm.eclass with the help of Michał and my mentor, and it is now in good shape [1]. I must admit that the time to write an eclass for a beginner like me is much more than what I expected. In my proposal, I leave 4 weeks to finish it, 2-week implementation and 2-week polishing. In reality, I implemented within 2 weeks, but polished it for 4 weeks. I made a lot of QA issues and was not aware, which increases the number of review-modify cycles. During this process, I leant a lot:

1. Always re-read the eclass, especially comments and examples thoroughly after modification. Many times I forgot there is an example far from the change that should be updated because one functions changes its behavior.

2. Read the bash manual carefully, because properly usage of features like bash array can greatly simplify code.

3. Consider the maintenance difficulty of the eclass. I wrote a oddly specific `src_test`, which can cover all the cases of ROCm packages. But it’s not worth it, because specialized code should be placed into ebuilds, not one eclass. So instead, I remain the most common part, `check_amdgpu`, and get rid of phase functions, which made the eclass much cleaner.

I also find some bugs and their solutions. As I mentioned in week 10’s report, I observed many test failures in sci-libs/miopen based on vanilla clang. In this week, I figured out that they have 3 different reasons, and I’ve provided the two fixes for two failures ([2, 3]). The third issue, I’ve found it’s root cause [4]. I believe there would be a simple solution to this.

For gcc-12 issues, I also come to a brutal workaround [5]: undef the __noinline__ macro before including stdc++ headers and def it afterwards. I also observed that clang-15 does not fix this issue as expected, and provided a MWE at [6].

I’m also writing wiki pages, filling installation and developing guide.

In this 12-week project, I proposed to deliver rocm.eclass, and packages like pytorch, tensorflow with rocm enabled. Instead, I delivered rocm.eclass as proposed, but migrated the ROCm toolchain to vanilla clang. I thought porting ROCm toolchain to vanilla clang is closer to my project title “Refining ROCm Packages” 🙂

[1] https://github.com/gentoo/gentoo/pull/26784
[2] https://github.com/littlewu2508/gentoo/commit/2bfae2e26a23d78b634a87ef4a0b3f0cc242dbc4
[3] https://github.com/littlewu2508/gentoo/commit/cd11b542aec825338ec396bce5c63bbced534e27
[4] https://github.com/ROCmSoftwarePlatform/MIOpen/issues/1731
[5] https://github.com/littlewu2508/gentoo/commit/2a49b4db336b075f2ac1fdfbc907f828105ea7e1
[6] https://github.com/llvm/llvm-project/issues/57544

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Week 11 Report for Refining ROCm Packages in Gentoo

My progress this week is mainly writing wiki and refining rocm.eclass.

Although the current eclass can work with my new ebuilds [1], Michał Górny has pointed out various flaws on the Github PR [2]. He also pointed out the necessity about rocm.eclass, because it seems like a combination of two eclasses. In my opinion, rocm.eclass has its value, mainly for handling USE_EXPANDS and common phase functions. The ugly part is mainly in rocm_src_test: due to the inconsistency of test methods of packages in [3], I have to detect which method is using and do it accordingly. So my plan is to split the one-size-fits-all rocm_src_test into two functions, corresponding to two scenarios (cmake test or standalone binary), and let each ebuild decide which to use. This can avoid detailed detection code that make rocm_src_test bloated.

Wiki writing: I think the main part of ROCm wiki[1] and HIP[2] is nearly finished. But due to the delay of rocm.eclass, the related information is not appended (ROCm#Developing guide). There is also a section a reserved: ROCm#Installation guide. I have little clue on how to write this part, because ROCm is a wide collection of packages. Maybe a meta package (there are users working on this) would be helpful.

To be honest I’m a bit anxious, because there is only one week left, but there are still a lot to be determined and tested on rocm.eclass along with the sci-libs/roc* ebuilds. I hope I can resolve these core issues in the last week.

[1] https://github.com/littlewu2508/gentoo/tree/rocm-5.1.3-scilibs
[2] https://github.com/gentoo/gentoo/pull/26784
[3] https://github.com/ROCmSoftwarePlatform
[4] https://wiki.gentoo.org/wiki/ROCm
[5] https://wiki.gentoo.org/wiki/HIP

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Week 10 Report for Refining ROCm Packages in Gentoo

This week I have leant a lot from Ulrich’s comments on rocm.eclass. I polished the eclass to v3 and send to gentoo-dev mailing list. However, I observed another error introduced in v3, and I’ll include a fix for it in the v4 in the following days.

Another half of my time is spent on testing sci-libs/roc-* packages on various platforms, utilizing rocm.eclass. I can say that rocm.eclass did its job as expected, so I believe after v4 it can be merged.

With src_test enabled, I have found various test failures. rocBLAS-5.1.3 fails 3 tests on Radeon RX 6700XT, slightly exceeding tolerance, which seems not a big issue; rocFFT-5.1.3 fails 16 suites on Radeon VII [1], which is serious and confirmed by upstream, so I suggest masking <code>amdgpu_targets_gfx906</code> USE flag for rocFFT-5.1.3; just today I observe MIOpen is failing many tests, probably due to vanilla clang. I’ll open issues and report those test failures to upstream. Running tests suite takes a lot of time, and often drain the GPU. It may takes more than 15 hours testing rocBLAS, even on performant CPU like Ryzen 5950X. If I use the GPU to render graphics (run a desktop environment) and do test simultaneously, it often result in amdgpu driver failure. I hope one day we can have a testing farm for ROCm packages, but that would be expensive because there are a lot of GPU architectures, and the compilation takes a lot of time.

I planned to finish the draft of wiki pages [2,3], but turns out I’m running out of time. I’ll catch up in week 11. My mentor is also busy in week 10, so my PR about rocm-opencl-runtime is still pending for review. Now we are working on solving the dependency issue of ROCm packages — gcc-12 and gcc-11.3.0 incompatibilities. Due to two bugs, the current stable gcc, gcc-11.3.0 cannot compile some ROCm packages [4], and the current unstable gcc, gcc-12, is unable to compile nearly all ROCm packages [5].

I’ll continue to do what’s postponed in week 10 — landing rocm.eclass and sci-libs packages, preparing cupy, fixing bugs, and writing the wiki pages. I’ll investigate MIOpen’s situation as well.

[1] https://github.com/ROCmSoftwarePlatform/rocFFT/issues/369
[2] https://wiki.gentoo.org/wiki/ROCm
[3] https://wiki.gentoo.org/wiki/HIP
[4] https://bugs.gentoo.org/842405
[5] https://bugs.gentoo.org/857660

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Week 9 Report for Refining ROCm Packages in Gentoo

This week I mainly focused on dev-libs/rocm-opencl-runtime.

I bumped dev-libs/rocm-opencl-runtime to 5.1.3. That’s relatively easy. The difficult part is enabling its tests. I came across a major problem, which is oclgl test requiring X server. I compiled using debug options and use gdb to dive into the code, but found there is no simple solution. Currently the test needs a X server where OpenGL vender is AMD. Xvfb only provides llvmpipe, not meeting the requirements. I consulted some friends, they said NVIDIA recommends using EGL when there is no X [1], but apparently ROCm can only get OpenGL from X [2]. So my workaround is to let user passing an X display into the ebuild, by reading the environment variable OCLGL_DISPLAY (DISPLAY variable will be wiped when calling emerge, while this can survive). If no display is detected, or glxinfo shows the OpenGL vendor is not AMD, then src_test dies, throwing indications about running an X server using amdgpu driver.

I was also trapped by CRLF problem in src_test of dev-libs/rocm-opencl-runtime. Tests in oclperf.exclude should be skipped for oclperf test, but it did not. After numerous trials, I finally found that this file is using CRLF, not LF, which causes the exclusion failed 🙁

Nevertheless, rocm-opencl-runtime tests passed on Radeon RX 6700XT! A good thing, because I know many user in Gentoo rely on this package to provide opencl in their computation, and the correctness is vital. Before we does not have src_test enabled. The PR is now in [6].

Other works including starting wiki writing [3,4], refine rocm.eclass according to feedback (not much, see gentoo-dev mailing list), and found a bug of dev-util/hipFindHIP.cmake module is not in the correct place. Fix can be found in [5] but I need to further polish the patch before PR.

If no further suggestions on rocm.eclass, I’ll land rocm.eclass in ::gentoo next week, and start bumping the sci-libs version already done locally.

[1] https://developer.nvidia.com/blog/egl-eye-opengl-visualization-without-x-server/
[2] https://github.com/RadeonOpenCompute/ROCm-OpenCL-Runtime/blob/bbdc87e08b322d349f82bdd7575c8ce94d31d276/tests/ocltst/module/common/OCLGLCommonLinux.cpp
[3] https://wiki.gentoo.org/wiki/ROCm
[4] https://wiki.gentoo.org/wiki/HIP
[5] https://github.com/littlewu2508/gentoo/tree/hip-correct-cmake
[6] https://github.com/gentoo/gentoo/pull/26870

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Week 8 Report for Refining ROCm Packages in Gentoo

This week there are two major progress: dev-util/rocprofiler and rocm.eclass.

I have implemented all the functions I think necessary for rocm.eclass. It was just send to rocm.eclass draft to gentoo-dev mailing list (also with a Github PR at [1]), please have a review. In the following weeks, I will collect feedbacks and continue to polish it.

In summary, I have implemented those functions which is listed in my proposal:
USE_EXPNAD of amdgpu_targets_, and ROCM_USEDEP to make the use flag coherent among dependencies;
rocm_src_configure contains common arguments in src_prepare;
rocm_src_test which checks the permission on /dev/kfd and /dev/dri/render*

There are also something listed in proposal but I decided not to implement now:
rocm_src_prepare: although there are some similarities among ebuilds, src_prepare are highly customized to each ROCm components. Unifying would take extra work.
SRC_URI: currently all SRC_URI is already specified in each ebuilds. It does not hurt to keep the status quo.

Moreover, during implementation I found another feature necessary
rocm_src_test: correctly handles different scenarios. ROCm packages may have cmake test, which can be run using cmake_src_test, or only compiled some testing binaries which requires execution from command-line. I made rocm_src_test automatically detect the method, so ROCm packages just have to call this function directly without doing anything.

Actually I have never imagined rocm.eclass could be in this shape eventually. Initially I just thought it would provide some utilities, mainly src_test and USE_EXPAND. But when implementing I found all these feature requires careful treatment. The comments (mainly examples) also takes half of the length. It ends up in 278 lines, which is a middle-sized among current eclasses. Maybe it can be further trimmed down after polishing, because there could be awkward implementations or re-inventions in it.

Based on my draft rocm.eclass, I have prepared sci-libs/roc*=5.1.3, sci-lib/hip-*-5.1.3 and dev-python/cupy making use of it. It feels great to simplify the ebuilds, and portage can handles the USE_EXPAND and dependencies just as expected. Once the rocm.eclass get in tree, I’ll push those ROCm-5.1.3 ebuilds.

Anther thing to mention is that ROCm-5.1.3 toolchains finally get merged [5], with the fixed dev-util/rocprofiler-{4.3.0,5.0.2,5.1.3}. rocprofiler is actually buggy before, because I thought I committed the patch which stripped the libhsa-amd-aqlprofile.so loading (I even claimed it in the commit message), but it was not committed and lost in history. So I reproduced the patch. Also, I did some research about this proprietary lib. By default, not loading it means tracing hsa/hip is not possible — you only get basic information like name and time of each GPU kernel execution, but do not know the pipeline of kernel execution (which one has spawned which kernel). AQL should be HSA architected queuing language (HSA AQL), where https://llvm.org/docs/AMDGPUUsage.html#hsa-aql-queue documented. It did sound related to the pipeline of kernel dispatching. By the description, libhsa-amd-aqlprofile.so is an extension API of AQL Profile. But actually, patching the source code to let rocprofiler not loading libhsa-amd-aqlprofile.so does not breaks the tracing of hsa/hip. So, I’m not sure why libhsa-amd-aqlprofile.so is needed, and raised a question at [2]. So I complete the fix in [3,4].

According to the renewed proposal (I have been leaving for two weeks, so there are changes in plan), I should collect feedback and refine rocm.eclass, and prepare dev-python/cupy and sci-libs/rocWMMA. I’ll investigate ROCgdb, too. Also, rocm-device-libs is a major package because many users relies on it to provide opencl. I’ll work on bumping its version, too. What’s more, with hip-5.1.3 against vanilla clang, rocm for blender can land in ::gentoo.

[1] https://github.com/gentoo/gentoo/pull/26784
[2] https://github.com/RadeonOpenCompute/ROCm/issues/1781
[3] https://github.com/gentoo/gentoo/pull/26755
[4] https://github.com/gentoo/gentoo/pull/26771
[5] https://github.com/gentoo/gentoo/pull/26441

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Week 12 Report for RISC-V Support for Gentoo Prefix

Hello all,
Hope you all are doing good, this is my report for 12th week of my Google Summer of Code project.

I got documentation on Porting Prefix reviewed and I have added the suggested changes.

My GSoC delieverables have been completed, so I played around with the compatibility layer and ansible. Synced the latest changes to the bootstrap script from upstream and used it for installing prefix. Working on updating the main.yml[1] accordingly. The process has been smooth so far, within next few weeks we might have a working compatibility layer for RISC-V.

Will start working on the final report and update the blogs on Gentoo Blog site. Although the official period is over I will continue working on compatibility layer and there are also few other things like pkgcraft in my bucket list which I will get my hands on.

The 12 weeks of GSoC have been super fun, thanks to mentors and the community.

[1] https://github.com/EESSI/compatibility-layer/blob/main/ansible/playbooks/roles/compatibility_layer/defaults/main.yml

Regards,
wiredhikari

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Gentoo musl Support Expansion for Qt/KDE Week 12

This week has been mostly been spent on writing documentation and fixing up some left over things.

I started with looking over the *-standalone libraries. It turns out that tree.h is provided by libbsd and because libbsd works just fine on musl I removed the standalone. The second thing I did was removing error.h because it caused issues with some builds, and we suspect it works on Void Linux because they build packages inside a clean chroot (without error.h). The only one left is now cdefs.h. This header is an internal glibc header, and using it is basically a bug, so upstreaming fixes should be very easy. Therefore I feel like this doesn’t need to be added either, so I closed the pull request for now.

Next I rewrote Sam’s musl porting notes, moving it from his personal page to a “real” wiki page (https://wiki.gentoo.org/wiki/Musl_porting_notes). It’s now more like a wiki page and less like a list of errors with attached fixes. I’ve also added several things myself into it.

Another wiki I’ve added stuff to is Chroot (https://wiki.gentoo.org/wiki/Chroot#Sound_and_graphics). In my GSoC planning I wanted to write documentation about using Gentoo musl. There I wanted information about how to work around using glibc programs that do not work on musl, ex proprietary programs. Instead of doing that I wrote documentation about how running graphical applications with sound into the Chroot documentation, as it helps every Gentoo user. I don’t think Gentoo musl users should have any issues finding the Chroot wikipage. 🙂

I have also tested gettext-tiny on Gentoo musl. This is a smaller implementation of gettext with some functionality stubbed out. gettext-tiny is built for musl, and it makes use of the libintl provided by musl. For users that only want English this makes a lot of sense because it is much smaller than gettext but still allows most packages to be built. When replacing gettext Portage complained about two packages using uninstalled libraries from GNU gettext, those being bison and poxml. When reemerging bison it errored out and I was sure it was because of gettext, but after debugging bison I found out it was caused by error-standalone. After unmerging error-standalone bison detected that the library was not installed and it compiled correctly. Poxml on the other hand hard depends on libgettextpo, a library not provided by gettext-tiny. Running “equery d -a poxml” however we can see that nothing important actually depends on poxml, so gettext-tiny should for the most part be fine.

$ equery d -a poxml
* These packages depend on poxml:
kde-apps/kdesdk-meta-22.04.3-r1 (>=kde-apps/poxml-22.04.3:5)
kde-apps/kdesdk-meta-22.08.0 (>=kde-apps/poxml-22.08.0:5)

Next week I will write my final evaluation and then I am done with GSoC! I will however continue working with some things like ebuildshell and crossdev when I have time.

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Gentoo musl Support Expansion for Qt/KDE Week 11

This week has mostly been dedicated to fixing old, and harder problems that I had previously put off. I spent a whole lot of time learning about the AccountsService codebase and setting up systems with LDAP authentication, but it turned out it didn’t need a rewrite after reading a couple of issues on the GitLab page, more on that later.
Continue reading

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