asavonic added a comment. @nickdesaulniers, thanks a lot for reporting this! Unfortunately it is not easy to keep compatibility with GCC in this case. GCC has this diagnostic very late in the pipeline, and trivial uses of `long double` type (e.g. unused variables, constant expressions) can be optimized away before that. We cannot do the same with LLVM, because there is no way to emit a nice source-level diagnostic from the codegen. I suggest to fix the kernel, because it looks like the `long double` literal is not intentional and can be replaced with just `double`.
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