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Description
(This issue is mostly a continuation of ziglang/zig#23520.)
This started happening after Zig updated their LLVM to version 20, and we believe this issue is caused by changes in LLVM 20.x. Whenever I target arm(eb)-linux-(musl/gnu)eabihf, the errors below occur (and sorry I don't have vanilla Clang error output):
[3395/4933] Building CXX object lib/Target/X86/Disassembler/CMakeFiles/LLVMX86Disassembler.dir/X86Disassembler.cpp.o
FAILED: lib/Target/X86/Disassembler/CMakeFiles/LLVMX86Disassembler.dir/X86Disassembler.cpp.o
/home/runner/work/android-ndk-custom/android-ndk-custom/zig-as-llvm/bin/c++ -DGTEST_HAS_RTTI=0 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/runner/work/android-ndk-custom/android-ndk-custom/build/armeb-linux-musleabihf/lib/Target/X86/Disassembler -I/home/runner/work/android-ndk-custom/android-ndk-custom/llvm/lib/Target/X86/Disassembler -I/home/runner/work/android-ndk-custom/android-ndk-custom/llvm/lib/Target/X86 -I/home/runner/work/android-ndk-custom/android-ndk-custom/build/armeb-linux-musleabihf/lib/Target/X86 -I/home/runner/work/android-ndk-custom/android-ndk-custom/build/armeb-linux-musleabihf/include -I/home/runner/work/android-ndk-custom/android-ndk-custom/llvm/include -isystem /home/runner/work/android-ndk-custom/android-ndk-custom/output/armeb-linux-musleabihf/include -fsanitize=undefined -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Os -DNDEBUG -std=c++17 -fvisibility=hidden -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -MD -MT lib/Target/X86/Disassembler/CMakeFiles/LLVMX86Disassembler.dir/X86Disassembler.cpp.o -MF lib/Target/X86/Disassembler/CMakeFiles/LLVMX86Disassembler.dir/X86Disassembler.cpp.o.d -o lib/Target/X86/Disassembler/CMakeFiles/LLVMX86Disassembler.dir/X86Disassembler.cpp.o -c /home/runner/work/android-ndk-custom/android-ndk-custom/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
fatal error: error in backend: Constant Island pass failed to converge!
zig: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 20.1.2 (https://github.com/ziglang/zig-bootstrap 8ea7838cc51bec700319d7f7c4017554ac22f819)
Target: armebv7a-unknown-linux4.19.0-musleabihf
Thread model: posix
InstalledDir: /opt/hostedtoolcache/zig/0.15.0-dev.263/x64
zig: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
zig: note: diagnostic msg: /tmp/X86Disassembler-953851.cpp
zig: note: diagnostic msg: /tmp/X86Disassembler-953851.sh
zig: note: diagnostic msg:
********************
and reminding that host LLVM and target LLVM is NOT same version.
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