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* build-scripts/build_llvm.py: bump to llvm 18 cf. https://github.com/bytecodealliance/wasm-micro-runtime/issues/4210 why not 20? because, as of writing this, 19 is the latest released version for the xtensa fork of llvm: https://github.com/espressif/llvm-project why not 19? because of a bug in the xtensa fork of llvm: https://github.com/espressif/llvm-project/issues/112 while we can use different versions for different targets, it's nicer to use the same version everywhere when possible. * spec-test-script/runtest.py: --size-level=0 for x86-64 with the recent version of LLVM, wamrc --size-level=1 often generates R_X86_64_32S relocations which fail on load with the infamous error: "relocation truncated to fit R_X86_64_32S failed" it seems that these relocations are often for jump tables. this commit workarounds it with --size-level=0. an alternative is to disable jump tables. (although it seems that jump tables are not the only source of these relocations.) cf. https://github.com/bytecodealliance/wasm-micro-runtime/issues/3035 it might be better to do this in wamrc itself. however, currently target info is not available there in case of native compilation. related: https://github.com/bytecodealliance/wasm-micro-runtime/issues/3356 * wamr-compiler: size_level=0 for sgx mode cf. https://github.com/bytecodealliance/wasm-micro-runtime/issues/3035