[llvm-bugs] [Bug 32518] New: lld master error: can't create dynamic relocation R_AARCH64_PREL64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32518

            Bug ID: 32518
           Summary: lld master error: can't create dynamic relocation
                    R_AARCH64_PREL64
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: minseong.kim at linaro.org
                CC: llvm-bugs at lists.llvm.org

Created attachment 18217
  --> https://bugs.llvm.org/attachment.cgi?id=18217&action=edit
creduced object

This error occurs with lld at symbol resolution, but it works fine with bfd or
gold. I have attached 2 set of sources, normal and creduced.

  1. Noraml
    - Command: ld.lld -shared sha1-armv8.o -o sha1-armv8.lld.so
    - Output:  ld.lld: error: sha1-armv8.S:1202: can't create dynamic
relocation R_AARCH64_PREL64 against symbol 'OPENSSL_armcap_P' defined in
sha1-armv8.o
    - Original sha1-armv8.orig.S from which sha1-armv8.o is generated.

  2. Creduced 
    - Command: ld.lld -shared sha1-armv8.creduced.o -o sha1-armv8.lld.so
    - Output: ld.lld: error: sha1-armv8.creduced.o:(.text+0x0): can't create
dynamic relocation R_AARCH64_PREL64 against symbol 'a' defined in
sha1-armv8.creduced.o
    - Creduced sha1-armv8.S from which sha1-armv8.creduced.o is generated.

It seems that the root cause of this error is that the symbol,
R_AARCH64_PREL64, is evaluated as preemptible. I am not sure this is a subtle
corner case of symbol resolution or intentional.

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