[llvm-bugs] [Bug 31261] New: LLD fails to link an obj using versioned symbols

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31261

            Bug ID: 31261
           Summary: LLD fails to link an obj using versioned symbols
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: mail+llvm at tzik.jp
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

LLD fails to handle a .symver hack done in gRPC.
https://chromium.googlesource.com/external/github.com/grpc/grpc/+/master/src/core/lib/support/wrap_memcpy.c

Here is a repro case:
----
$ cat > failcase.s <<EOF
  .text
  memcpy at GLIBC_2.2.5 = memcpy

  .globl main
  .p2align 4, 0x90
  .type main, at function
main:
  callq»  memcpy
  retq
EOF
$ clang -fuse-ld=lld failcase.s
symbol memcpy at GLIBC_2.2.5 has undefined version GLIBC_2.2.5
----

Or, in C.
----
$ cat > failcase.c <<EOF
__asm__(".symver memcpy,memcpy at GLIBC_2.2.5");

void* memcpy(void* dest, const void* src, unsigned long size);

void* foo(void* dest, const void* src, unsigned long size) {
  return memcpy(dest, src, size);
}

int main(int argc, const char** argv) {
   return 0;
}
EOF
$ clang -fuse-ld=lld failcase.c
symbol memcpy at GLIBC_2.2.5 has undefined version GLIBC_2.2.5
----

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