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How to use pre-installed llvm? #941

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yurivict opened this issue Apr 8, 2021 · 1 comment
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How to use pre-installed llvm? #941

yurivict opened this issue Apr 8, 2021 · 1 comment
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C-llvm Q-question

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@yurivict
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yurivict commented Apr 8, 2021

retdec behins to download llvm (https://github.com/avast/llvm/archive/2a1f3d8a97241c6e91710be8f84cf3cf80c03390.zip) when I have llvm10-10.0.1_5 installed.

How to instruct build to use pre-installed llvm?
@s3rvac
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s3rvac commented Apr 8, 2021

Hi. RetDec requires a custom version of LLVM with downstream changes that are needed for the decompiler to work properly. Other LLVM versions (e.g. system wide) cannot be used because (1) they do not contain the necessary changes and (2) they might be incompatible (e.g. LLVM 10 is not compatible with LLVM 8, which is what RetDec is currently using).

There is a ticket for adding support for system-wide libraries into RetDec (#356). For some libraries, this has been already done, but not for LLVM. However, frankly, I do not think that it will ever happen for LLVM because of the two reasons above.

@s3rvac s3rvac closed this as completed Apr 8, 2021
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