setup-build-env: fixup LLVM installation script for recent Debians #213
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TL;DR Don't use llvm.sh on Debian.
There are a couple of issues with using official llvm.sh installation
script on recent debians. The first one is this:
61.12 W: OpenPGP signature verification failed:
https://apt.llvm.org/unstable llvm-toolchain-21 InRelease: Sub-process
/usr/bin/sqv returned an error code (1), error message is: Signing key
on 6084F3CF814B57C1CF12EFD515CF4D18AF4F7421 is not bound:
No binding signature at time 2025-12-21T23:13:57Z because: Policy
rejected non-revocation signature (PositiveCertification) requiring
second pre-image resistance because: SHA1 is not considered secure
since 2026-02-01T00:00:00Z
Which requires updates on LLVM distribution side.
The second is that debian removed software-properties-common package
due to a bug [1].
All this is unimportant on Debian though, because LLVM 21 is available
in default debian PPAs. So simply install llvm packages directly, if
we are on Debian.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038747
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TL;DR Don't use llvm.sh on Debian.
There are a couple of issues with using official llvm.sh installation script on recent debians. The first one is this:
Which requires updates on LLVM distribution side.
The second is that debian removed software-properties-common package due to a bug [1].
All this is unimportant on Debian though, because LLVM 21 is available in default debian PPAs. So simply install llvm packages directly, if we are on Debian.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038747