https://bugs.llvm.org/show_bug.cgi?id=42343
Bug ID: 42343
Summary: llvm::object::MachOUniversalBinary does not handle
executables with hidden ARM64
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Keywords: missing-feature
Severity: enhancement
Priority: P
Component: Object
Assignee: unassignedb...@nondot.org
Reporter: anusha.bas...@gmail.com
CC: llvm-bugs@lists.llvm.org
Cctool lipo has a flag -hideARM64:
-hideARM64
When creating a universal binary including both 32-bit and 64-bit ARM
files, this option will ask lipo to add the 64-bit files at the end and not
include them in the count of architectures present in the file. The files
must be executable files (Mach-O filetype MH_EXECUTE). This option has no
effect if neither 32-bit ARM nor 64-bit ARM files are present, and no other
files may be hidden in this way. This option only works with the -create,
-remove, and -replace, commands, and is only intended for tools and workflows
testing a workaround on older systems.
This bug is relevant for the implementation of llvm-lipo -thin flag, where a
thin output file is created given a universal binary and a specified
architecture type.
The hidden ARM64 slice is not included in the header,
MachOUniversalBinary::ObjectForArch::ObjectForArch(const MachOUniversalBinary
*Parent, uint32_t Index) will not work for an index that is "out of range"
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