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2022-10-30 15:09:37 +08:00
< a accesskey = "h" href = "./../posts" > UP < / a >
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< h1 class = "title" > Gentoo LLVM_TARGETS not Working?< / h1 >
< p >
2022-10-30 15:09:37 +08:00
Recently, I would like to test switching from < code > gcc< / code > to < a href = "https://wiki.gentoo.org/wiki/Clang" > clang< / a > on my Gentoo VM.< br / >
< del > warning: you will be crazy to have too many packages can't be build with clang< / del > < br / >
2022-10-30 14:25:15 +08:00
< / 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 >
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< 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
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< 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 >
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< h2 > < span class = "section-number-2" > 3.< / span > < i > < b > solution< / b > < / i > < / h2 >
< div class = "outline-text-2" id = "text-3" >
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< 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 >
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< / div >
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< 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 >
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< 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 >
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< h2 > < span class = "section-number-2" > 4.< / span > finally I got this:< / h2 >
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< 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 >
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2022-11-18 13:14:16 +08:00
2022-10-30 14:25:15 +08:00
< p class = "author" > Author: dongdigua< / p >
2022-11-18 13:14:16 +08:00
< p class = "date" > Date: 2022-10-29 六 00:00< / p >
< p class = "date" > Build: 2022-11-18 五 13:58< / p >
2022-10-30 14:25:15 +08:00
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