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Blind_Sniper
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 Posted: Wed Dec 18, 2024 12:05 pm Post subject: How do I get rid of LLVM? |
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Hi.
Finally llvm-related software became the most bloated part of the system (apart from qt). As far as I understand llvm is just a kind of frontend to compilers, so I wondering, is it possible to get rid of this bloatware?
If there is useful info about it, please share
Thanks
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Hu
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| Posted: Wed Dec 18, 2024 12:13 pm Post subject: |
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You can remove it just like anything else: emerge --ask --verbose --depclean sys-devel/llvm. If it is on your system, this will probably fail with a message about some package that needs it. Add that package to the depclean list and retry. Keep growing the list until either you find a package you're not willing to remove, or you get a successful run. In some cases, packages conditionally need it based on a USE flag. If that is your situation, disabling the USE flag (and rebuilding the affected package) may let you remove LLVM without removing the consuming package. This depends on whether the USE flag controls a feature you are not willing to remove.
My guess is that you will fail, as most modern graphical desktops want Mesa, and Mesa wants LLVM, at least in the common configurations. However, some less common configurations, and anything that can remove Mesa, may not be blocked here. |
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Blind_Sniper
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| Posted: Wed Dec 18, 2024 1:43 pm Post subject: |
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Thanks ofr reply!
| Code: | emerge --ask --verbose --depclean llvm
Calculating dependencies... done!
llvm-core/llvm-18.1.8-r1 pulled in by:
dev-util/intel_clc-24.2.8 requires llvm-core/llvm:18/18.1=, llvm-core/llvm:18=
dev-util/spirv-llvm-translator-18.1.4 requires llvm-core/llvm:18/18.1=[abi_x86_64(-)], llvm-core/llvm:18=[abi_x86_64(-)]
llvm-core/clang-18.1.8 requires ~llvm-core/llvm-18.1.8[llvm_targets_AMDGPU], ~llvm-core/llvm-18.1.8[llvm_targets_LoongArch], ~llvm-core/llvm-18.1.8[llvm_targets_Lanai], ~llvm-core/llvm-18.1.8[llvm_targets_MSP430], ~llvm-core/llvm-18.1.8[llvm_targets_ARM], ~llvm-core/llvm-18.1.8[llvm_targets_AVR], ~llvm-core/llvm-18.1.8[llvm_targets_WebAssembly], ~llvm-core/llvm-18.1.8[llvm_targets_Sparc], ~llvm-core/llvm-18.1.8[llvm_targets_Mips], ~llvm-core/llvm-18.1.8[llvm_targets_XCore], ~llvm-core/llvm-18.1.8[llvm_targets_NVPTX], ~llvm-core/llvm-18.1.8[llvm_targets_SystemZ], ~llvm-core/llvm-18.1.8[llvm_targets_AArch64], ~llvm-core/llvm-18.1.8:18/18.1=[-debug,abi_x86_64(-)], ~llvm-core/llvm-18.1.8[llvm_targets_PowerPC], ~llvm-core/llvm-18.1.8[llvm_targets_Hexagon], ~llvm-core/llvm-18.1.8[llvm_targets_X86], ~llvm-core/llvm-18.1.8[llvm_targets_RISCV], ~llvm-core/llvm-18.1.8[llvm_targets_BPF], ~llvm-core/llvm-18.1.8[llvm_targets_VE]
llvm-core/llvm-toolchain-symlinks-18-r1 requires llvm-core/llvm:18
llvm-core/llvmgold-18 requires llvm-core/llvm:18[binutils-plugin]
media-libs/mesa-24.2.8 requires llvm-core/llvm:18[llvm_targets_AMDGPU(+),abi_x86_64(-)] |
| Code: | emerge --ask --verbose --depclean dev-util/intel_clc
Calculating dependencies... done!
dev-util/intel_clc-24.2.8 pulled in by:
media-libs/mesa-24.2.8 requires ~dev-util/intel_clc-24.2.8 |
It seems only mesa depends on llvm . I removed mesa (built from sources) and installed it from binhost, and the same for intel_clc, but emerge --depclean still says that llvm is still required by mesa/intel_clc. Why binary packages requires compilers?
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Hu
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| Posted: Wed Dec 18, 2024 2:24 pm Post subject: |
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| LLVM is not just a compiler. Look at the list of libraries it installs. Even if it were only a compiler, if your depclean has --with-bdeps=y, then Portage would retain packages that you would need if you chose to rebuild Mesa from source. |
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Blind_Sniper
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| Posted: Wed Dec 18, 2024 4:17 pm Post subject: |
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At least switching to binary mesa prevented two new huge packages from being pulled in: llvm-runtimes/compiler-rt and llvm-runtimes/compiler-rt-sanitizers.
Not bad.
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Anon-E-moose
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| Posted: Wed Dec 18, 2024 4:22 pm Post subject: |
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a whole 57 meg ... impressive.
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Blind_Sniper
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| Posted: Wed Dec 18, 2024 4:58 pm Post subject: |
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| Anon-E-moose wrote: | | a whole 57 meg ... impressive. |
137 Mb, and a lot of time...
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Anon-E-moose
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| Posted: Wed Dec 18, 2024 5:19 pm Post subject: |
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Not to argue, but are you sure we're talking about the same packages?
| Code: | equery s compiler-rt-sanitizers
* llvm-runtimes/compiler-rt-sanitizers-17.0.6
Total files : 109
Total size : 30.22 MiB
equery s compiler-rt
* llvm-runtimes/compiler-rt-17.0.6
Total files : 13
Total size : 239.07 KiB
genlop -t compiler-rt-sanitizers |tail -3
Wed Dec 18 05:22:57 2024 >>> llvm-runtimes/compiler-rt-sanitizers-17.0.6
merge time: 39 seconds.
genlop -t compiler-rt |tail -3
Wed Dec 18 05:22:18 2024 >>> llvm-runtimes/compiler-rt-17.0.6
merge time: 15 seconds. |
Maybe llvm 19* version is larger, but I wouldn't think it would be that much larger.
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Blind_Sniper
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| Posted: Wed Dec 18, 2024 5:59 pm Post subject: |
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| Code: | emerge -s compiler-rt-sanitizers
[ Results for search key : compiler-rt-sanitizers ]
Searching...
* llvm-runtimes/compiler-rt-sanitizers
Latest version available: 19.1.4
Latest version installed: [ Not Installed ]
Size of files: 137945 KiB
Homepage: https://llvm.org/
Description: Compiler runtime libraries for clang (sanitizers & xray)
License: Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )
[ Applications found : 1 ] |
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logrusx
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| Posted: Wed Dec 18, 2024 8:17 pm Post subject: |
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| Blind_Sniper wrote: | As far as I understand llvm is just a kind of frontend to compilers, so I wondering, is it possible to get rid of this bloatware?
Thanks |
Are you seriously calling a compiler frontend bloatware?
| Compiler#Frontend wrote: | | The front end analyzes the source code to build an internal representation of the program, called the intermediate representation (IR). |
In other words it translates a high level language like C++ into IR:
| LLVM wrote: | | LLVM is designed around a language-independent intermediate representation (IR) that serves as a portable, high-level assembly language that can be optimized with a variety of transformations over multiple passes. |
Which is then processed by a frontend resulting in optimized, architecture specific byte code:
| Compiler#Backend wrote: | The back end is responsible for the CPU architecture specific optimizations and for code generation[56].
The main phases of the back end include the following:
- Machine dependent optimizations: optimizations that depend on the details of the CPU architecture that the compiler targets.[57] A prominent example is peephole optimizations, which rewrites short sequences of assembler instructions into more efficient instructions.
- Code generation: the transformed intermediate language is translated into the output language, usually the native machine language of the system. This involves resource and storage decisions, such as deciding which variables to fit into registers and memory and the selection and scheduling of appropriate machine instructions along with their associated addressing modes (see also Sethi–Ullman algorithm). Debug data may also need to be generated to facilitate debugging.
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| Blind_Sniper wrote: | | Code: | emerge -s compiler-rt-sanitizers
[ Results for search key : compiler-rt-sanitizers ]
Searching...
* llvm-runtimes/compiler-rt-sanitizers
Latest version available: 19.1.4
Latest version installed: [ Not Installed ]
Size of files: 137945 KiB
Homepage: https://llvm.org/
Description: Compiler runtime libraries for clang (sanitizers & xray)
License: Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )
[ Applications found : 1 ] |
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This is the size of the source package(s) to be downloaded. Although significantly bigger packages are expected to produce bigger binaries, that's not necessarily the case. You can't compare packages by the size of their source code. There might be correlation but not in an proportional.
Here's the binary size with the consideration that gcc is a monolith and say an LLVM C++ based compiler need several components:
| Code: | # equery s gcc
* sys-devel/gcc-13.3.1_p20241115
Total files : 1861
Total size : 264.79 MiB
* sys-devel/gcc-14.2.1_p20241116
Total files : 1936
Total size : 311.73 MiB |
| Code: | # equery s llvm-core/*
* llvm-core/clang-19.1.4
Total files : 1694
Total size : 186.86 MiB
* llvm-core/clang-common-19.1.4
Total files : 45
Total size : 101.56 KiB
* llvm-core/clang-runtime-19.1.4
Total files : 0
Total size : 0 bytes
* llvm-core/clang-toolchain-symlinks-19
Total files : 11
Total size : 72.04 KiB
* llvm-core/lld-19.1.4
Total files : 50
Total size : 6.22 MiB
* llvm-core/lld-toolchain-symlinks-19
Total files : 7
Total size : 72.01 KiB
* llvm-core/llvm-19.1.4
Total files : 2385
Total size : 246.01 MiB
* llvm-core/llvm-common-19.1.4
Total files : 24
Total size : 129.38 KiB
* llvm-core/llvm-toolchain-symlinks-18-r1
Total files : 31
Total size : 72.27 KiB
* llvm-core/llvm-toolchain-symlinks-19
Total files : 31
Total size : 72.27 KiB
* llvm-core/llvmgold-19
Total files : 6
Total size : 20.04 KiB |
| Code: | # equery s llvm-runtimes/*
* llvm-runtimes/compiler-rt-19.1.4
Total files : 16
Total size : 595.33 KiB
* llvm-runtimes/compiler-rt-sanitizers-19.1.4
Total files : 138
Total size : 40.96 MiB
* llvm-runtimes/openmp-19.1.4
Total files : 18
Total size : 3.05 MiB |
It seems LLVM can also be used independently. At least that seem to be the case with firefox, because I have llvm-18 because of it(stripped from the above output for clarity), but no 18 version of the other components. Unless it's using the newer ones.
One thing to note is the difference between GCC 13 and 14. Programming languages standards evolve and become more complex. Indeed this is the case with C++. This also contributes to increase in source and binary size. So you're calling the development of languages bloatware?
Best Regards,
Georgi |
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