There is an updated pull request by q66 against master on the void-packages repository

https://github.com/void-ppc/void-packages llvm10
https://github.com/void-linux/void-packages/pull/21756

LLVM/Clang 10
# needs rebuilding (unticked still needs testing)

- [x] libclc-git
- [x] mesa
- [x] llvm9
- [x] bpftrace
- [x] gnome-builder
- [x] juCi++
- [x] kdevelop
- [x] qt5
- [x] qtcreator
- [x] rtags
- [x] shiboken2
- [x] rdedup
- [x] codelite
- [x] bcc
- [x] ccls
- [x] clazy
- [x] afl (x86 only, need help)
- [ ] beignet (x86 only, need hlep)
- [ ] ispc (x86 only, need help)
- [x] llvm-libunwind
- [x] libcxx
- [x] libcxxabi
- [x] include-what-you-use

# no bump but test build anyway

- [x] hfsprogs
- [ ] godot
- [ ] firefox
- [ ] firefox-esr
- [ ] thunderbird
- [x] bat
- [ ] blender
- [ ] ardour
- [ ] pijul
- [ ] qv4l2
- [ ] yosys


A patch file from https://github.com/void-linux/void-packages/pull/21756.patch is attached