2022-10-30 14:25:15 +08:00
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#+TITLE: Gentoo LLVM_TARGETS not Working?
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#+DATE: <2022-10-29 六>
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#+OPTIONS: toc:nil
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2022-10-30 15:09:37 +08:00
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Recently, I would like to test switching from =gcc= to [[https://wiki.gentoo.org/wiki/Clang][clang]] on my Gentoo VM.
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+warning: you will be crazy to have too many packages can't be build with clang+
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2022-10-30 14:25:15 +08:00
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* problem
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First I want to make [[https://llvm.org][LLVM]] not targeting too many platform, but changing =LLVM_TARGETS= don't work
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#+BEGIN_SRC shell
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[ebuild N ] sys-devel/llvm-15.0.3:15::gentoo USE="binutils-plugin libffi
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ncurses -debug -doc -exegesis -libedit -test -verify-sig -xar -xml -z3 -zstd"
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LLVM_TARGETS="(AArch64) (AMDGPU) (ARM) (AVR) (BPF) (Hexagon) (Lanai) (MSP430)
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(Mips) (NVPTX) (PowerPC) (RISCV) (Sparc) (SystemZ) (VE) (WebAssembly) (X86)
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(XCore) (-ARC) (-CSKY) (-DirectX) (-LoongArch) (-M68k) (-SPIRV)" 241 KiB
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#+END_SRC
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* and I found [[https://forums.gentoo.org/viewtopic.php?p=8694331][[solved] LLVM_TARGETS not respected?]](Mar 2022) on gentoo forum
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It seems that global =LLVM_TARGETS= setting is not respected,
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and flags such as =llvm_targets_AArch64=, =llvm_targets_ARM=, are no longer there.
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They're now forced by default as a precaution.
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* /*solution*/
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** add something like =*/* -llvm_targets_AArch64= into =/etc/portage/profile/package.use.force=
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I excluded all targets exept for X86, but still 3 left: AMDGPU, BPF, NVPTX
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** so I also add =sys-devel/llvm -llvm_targets_AMDGPU -llvm_targets_BPF -llvm_targets_NVPTX= in =/etc/portage/package.use/=
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** and don't forget to add that three excluder to clang or other compiler that uses llvm
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* finally I got this:
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#+BEGIN_SRC shell
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[ebuild N ] sys-devel/llvm-15.0.3:15::gentoo USE="binutils-plugin libffi
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ncurses -debug -doc -exegesis -libedit -test -verify-sig -xar -xml -z3 -zstd"
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LLVM_TARGETS="(X86) -AArch64 -AMDGPU (-ARC) -ARM -AVR -BPF (-CSKY) (-DirectX)
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-Hexagon -Lanai (-LoongArch) (-M68k) -MSP430 -Mips -NVPTX -PowerPC -RISCV
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(-SPIRV) -Sparc -SystemZ -VE -WebAssembly -XCore" 241 KiB
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#+END_SRC
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