Hi, I tested crystal 1.18.2+dfsg-1 with the build dependencies switched from lld-19 and llvm-19-dev to lld-21 and llvm-21-dev. The full sbuild completed successfully on amd64 unstable using the unshare backend.
The build selected LLVM 21 as expected: Using /usr/bin/llvm-config-21 [version=21.1.8] All three test suites passed: compiler_spec: 13307 examples, 0 failures, 0 errors, 18 pending std_spec: 17563 examples, 0 failures, 0 errors, 33 pending primitives_spec: 717 examples, 0 failures, 0 errors, 0 pending The compiler suite has one more example than the LLVM 19 build because LLVM 21 enables its conditional 128-bit enumerator test. The resulting crystal package depends on libllvm21, and readelf shows that the compiler itself links against libLLVM.so.21.1. The only issue after the build was that lintian could not be installed due to a temporary Perl dependency mismatch in unstable. This happened after all binary packages had been built; sbuild reported the package build itself as successful. I have attached the two-line dependency update. It is independent of the test fix in #1137045, so the two changes can also be applied together. -- Best regards Cheng Li
1124047-llvm21.patch
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