https://bugs.llvm.org/show_bug.cgi?id=45243
Bug ID: 45243
Summary: llvm-objcopy produces corrupted .debug_str for
elf32-x86-64 (X32 ABI) emulation (Z_DATA_ERROR)
Product: tools
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: llvm-objcopy/strip
Assignee: unassignedb...@nondot.org
Reporter: ndesaulni...@google.com
CC: alexander.v.shaposhni...@gmail.com,
jake.h.ehrl...@gmail.com,
jh7370.2...@my.bristol.ac.uk,
llvm-bugs@lists.llvm.org, mask...@google.com,
ruppre...@google.com, srhi...@google.com
Blocks: 4068
via: https://github.com/ClangBuiltLinux/linux/issues/514
$ wget
https://github.com/ClangBuiltLinux/linux/files/4351404/cbl-514-out.x86_64.tar.gz
$ gunzip cbl-514-out.x86_64.tar.gz
$ tar xf cbl-514-out.x86_64.tar
$ cd out.x86_64
$ llvm-objcopy -O elf32-x86-64 arch/x86/entry/vdso/vgetcpu.o foo.o
$ llvm-dwarfdump foo.o
error: failed to decompress '.debug_loc', zlib error: Z_DATA_ERROR
error: failed to decompress '.debug_abbrev', zlib error: Z_DATA_ERROR
error: failed to decompress '.debug_info', zlib error: Z_DATA_ERROR
error: failed to decompress '.debug_str', zlib error: Z_DATA_ERROR
error: failed to decompress '.debug_line', zlib error: Z_DATA_ERROR
...
$ objcopy -O elf32-x86-64 arch/x86/entry/vdso/vgetcpu.o foo.o
$ llvm-dwarfdump foo.o
(different issues)
It seems the compressed debug info is corrupted; lld chokes on this eventually
when passed these objects, but looks like the error actually comes from
llvm-objcopy.
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=4068
[Bug 4068] [Meta] Compiling the Linux kernel with clang
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