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<h1 class="title">Gentoo LLVM_TARGETS not Working?</h1>
<p>
Recently, I would like to test switching from <code>gcc</code> to <code>clang</code> on my Gentoo VM.<br />
Because if so, I can install <code>Rust</code> and <code>Zig</code> from source<br />
without worrying about adding the HUGE <code>clang</code> dependency that won't be used by other packages.<br />
Later I will remove <code>gcc</code> :)<br />
</p>
<div class="outline-2">
<h2><span class="section-number-2">1.</span> problem</h2>
<div class="outline-text-2" id="text-1">
<p>
First I want to make <a href="https://llvm.org">LLVM</a> not targeting too many platform, but changing <code>LLVM_TARGETS</code> don't work<br />
</p>
<div class="org-src-container">
<pre class="src src-shell">[ebuild N ] sys-devel/llvm-15.0.3:15::gentoo <span style="font-weight: bold; font-style: italic;">USE</span>=<span style="font-style: italic;">"binutils-plugin libffi</span>
<span style="font-style: italic;">ncurses -debug -doc -exegesis -libedit -test -verify-sig -xar -xml -z3 -zstd"</span>
<span style="font-weight: bold; font-style: italic;">LLVM_TARGETS</span>=<span style="font-style: italic;">"(AArch64) (AMDGPU) (ARM) (AVR) (BPF) (Hexagon) (Lanai) (MSP430)</span>
<span style="font-style: italic;">(Mips) (NVPTX) (PowerPC) (RISCV) (Sparc) (SystemZ) (VE) (WebAssembly) (X86)</span>
<span style="font-style: italic;">(XCore) (-ARC) (-CSKY) (-DirectX) (-LoongArch) (-M68k) (-SPIRV)"</span> 241 KiB
</pre>
</div>
</div>
</div>
<div class="outline-2">
<h2><span class="section-number-2">2.</span> and I found <a href="https://forums.gentoo.org/viewtopic.php?p=8694331">[solved] LLVM_TARGETS not respected?</a>(Mar 2022) on gentoo forum</h2>
<div class="outline-text-2" id="text-2">
<p>
It seems that global <code>LLVM_TARGETS</code> setting is not respected,<br />
and flags such as <code>llvm_targets_AArch64</code>, <code>llvm_targets_ARM</code>, are no longer there.<br />
They're now forced by default as a precaution.<br />
</p>
</div>
</div>
<div class="outline-2">
<h2><span class="section-number-2">3.</span> <i><b>solution</b></i></h2>
<div class="outline-text-2" id="text-3">
</div>
<div class="outline-3">
<h3><span class="section-number-3">3.1.</span> add something like <code>*/* -llvm_targets_AArch64</code> into <code>/etc/portage/profile/package.use.force</code></h3>
<div class="outline-text-3" id="text-3-1">
<p>
I excluded all targets exept for X86, but still 3 left: AMDGPU, BPF, NVPTX<br />
</p>
</div>
</div>
<div class="outline-3">
<h3><span class="section-number-3">3.2.</span> so I also add <code>sys-devel/llvm -llvm_targets_AMDGPU -llvm_targets_BPF -llvm_targets_NVPTX</code> in <code>/etc/portage/package.use/</code></h3>
</div>
<div class="outline-3">
<h3><span class="section-number-3">3.3.</span> and don't forget to add that three excluder to clang or other compiler that uses llvm</h3>
</div>
</div>
<div class="outline-2">
<h2><span class="section-number-2">4.</span> finally I got this:</h2>
<div class="outline-text-2" id="text-4">
<div class="org-src-container">
<pre class="src src-shell">[ebuild N ] sys-devel/llvm-15.0.3:15::gentoo <span style="font-weight: bold; font-style: italic;">USE</span>=<span style="font-style: italic;">"binutils-plugin libffi</span>
<span style="font-style: italic;">ncurses -debug -doc -exegesis -libedit -test -verify-sig -xar -xml -z3 -zstd"</span>
<span style="font-weight: bold; font-style: italic;">LLVM_TARGETS</span>=<span style="font-style: italic;">"(X86) -AArch64 -AMDGPU (-ARC) -ARM -AVR -BPF (-CSKY) (-DirectX)</span>
<span style="font-style: italic;">-Hexagon -Lanai (-LoongArch) (-M68k) -MSP430 -Mips -NVPTX -PowerPC -RISCV</span>
<span style="font-style: italic;">(-SPIRV) -Sparc -SystemZ -VE -WebAssembly -XCore"</span> 241 KiB
</pre>
</div>
<p>
in the end, <a href="https://wiki.gentoo.org/wiki/Gentoo_Cheat_Sheet">Gentoo cheatsheet</a> and <a href="https://wiki.gentoo.org/wiki/Clang">Gentoo Wiki: Clang</a> could be useful.<br />
</p>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="date">Date: 2022-10-29 六 00:00</p>
<p class="author">Author: dongdigua</p>
<p class="date">Created: 2022-10-30 日 14:16</p>
</div>
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_____ _ _ o
/ ___/__ __ _ (_)__ (_) /\--)
/ (_ / -_) ' \/ / _ \/ / /\ gem
\___/\__/_/_/_/_/_//_/_/
# Gopher/Gemini collections # Gopher/Gemini collections
A quiet place in the internet other than HyperText Machine Learning A quiet place in the internet other than HyperText Machine Learning

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(github "<a href=https://github.com/dongdigua>@dongdigua</a>") (github "<a href=https://github.com/dongdigua>@dongdigua</a>")
(bilibili "<a href=https://space.bilibili.com/489732092>董地瓜</a>") (bilibili "<a href=https://space.bilibili.com/489732092>董地瓜</a>")
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#+TITLE: Gentoo LLVM_TARGETS not Working?
#+DATE: <2022-10-29 六>
#+OPTIONS: toc:nil
Recently, I would like to test switching from =gcc= to =clang= on my Gentoo VM.
Because if so, I can install =Rust= and =Zig= from source
without worrying about adding the HUGE =clang= dependency that won't be used by other packages.
Later I will remove =gcc= :)
* problem
First I want to make [[https://llvm.org][LLVM]] not targeting too many platform, but changing =LLVM_TARGETS= don't work
#+BEGIN_SRC shell
[ebuild N ] sys-devel/llvm-15.0.3:15::gentoo USE="binutils-plugin libffi
ncurses -debug -doc -exegesis -libedit -test -verify-sig -xar -xml -z3 -zstd"
LLVM_TARGETS="(AArch64) (AMDGPU) (ARM) (AVR) (BPF) (Hexagon) (Lanai) (MSP430)
(Mips) (NVPTX) (PowerPC) (RISCV) (Sparc) (SystemZ) (VE) (WebAssembly) (X86)
(XCore) (-ARC) (-CSKY) (-DirectX) (-LoongArch) (-M68k) (-SPIRV)" 241 KiB
#+END_SRC
* and I found [[https://forums.gentoo.org/viewtopic.php?p=8694331][[solved] LLVM_TARGETS not respected?]](Mar 2022) on gentoo forum
It seems that global =LLVM_TARGETS= setting is not respected,
and flags such as =llvm_targets_AArch64=, =llvm_targets_ARM=, are no longer there.
They're now forced by default as a precaution.
* /*solution*/
** add something like =*/* -llvm_targets_AArch64= into =/etc/portage/profile/package.use.force=
I excluded all targets exept for X86, but still 3 left: AMDGPU, BPF, NVPTX
** so I also add =sys-devel/llvm -llvm_targets_AMDGPU -llvm_targets_BPF -llvm_targets_NVPTX= in =/etc/portage/package.use/=
** and don't forget to add that three excluder to clang or other compiler that uses llvm
* finally I got this:
#+BEGIN_SRC shell
[ebuild N ] sys-devel/llvm-15.0.3:15::gentoo USE="binutils-plugin libffi
ncurses -debug -doc -exegesis -libedit -test -verify-sig -xar -xml -z3 -zstd"
LLVM_TARGETS="(X86) -AArch64 -AMDGPU (-ARC) -ARM -AVR -BPF (-CSKY) (-DirectX)
-Hexagon -Lanai (-LoongArch) (-M68k) -MSP430 -Mips -NVPTX -PowerPC -RISCV
(-SPIRV) -Sparc -SystemZ -VE -WebAssembly -XCore" 241 KiB
#+END_SRC
in the end, [[https://wiki.gentoo.org/wiki/Gentoo_Cheat_Sheet][Gentoo cheatsheet]] and [[https://wiki.gentoo.org/wiki/Clang][Gentoo Wiki: Clang]] could be useful.

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"feed.xml" "feed.xml"
"./../" "./../"
"https://dongdigua.github.io" "https://dongdigua.github.io"
(delete "index.html" (directory-files "./../" nil ".*\.html$")) (delete "xmr.html" (delete "index.html" (directory-files "./../" nil ".*\.html$")))
:title "dongdigua's blog" :title "dongdigua's blog"
:description "Blog!" :description "Blog!"
:builder 'webfeeder-make-rss) :builder 'webfeeder-make-rss)

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## Table of Contents ## Table of Contents
### Posts (sorted by time) ### Posts (sorted by time)
[Gentoo LLVM\_TARGETS not Working?](gentoo_llvm_targets)<br>
[CentOS/Fedora 不同的配置默认都安装了什么软件](anaconda_kickstarts)<br> [CentOS/Fedora 不同的配置默认都安装了什么软件](anaconda_kickstarts)<br>
[build a nixos live image](nixos)<br> [build a nixos live image](nixos)<br>
[moonboos, 懂的都懂](moonboos)<br> [moonboos, 懂的都懂](moonboos)<br>

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<center><img src="./images/monero_request.png"/></center>
<center>47LjRRyNYWKf1W5NPmfgZXdZGnGXv4QZRjEnZJbrRRJkAbgikXJGecCNJiP2rny6SR3SSizTVYKJKFdhdKEf5scVMc9Zk1R</center>

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