llvm-13-dev - 1:13.0.1-6~deb11u1 main

LLVM is a collection of libraries and tools that make it easy to build
compilers, optimizers, just-in-time code generators, and many other
compiler-related programs.
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LLVM uses a single, language-independent virtual instruction set both
as an offline code representation (to communicate code between
compiler phases and to run-time systems) and as the compiler internal
representation (to analyze and transform programs). This persistent
code representation allows a common set of sophisticated compiler
techniques to be applied at compile-time, link-time, install-time,
run-time, or "idle-time" (between program runs).
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This package provides the libraries and headers to develop applications
using llvm.