REQUIRES: x86
RUN: split-file %s %t.dir && cd %t.dir

RUN: llvm-mc -filetype=obj -triple=x86_64-windows test.s -o test.obj
RUN: llvm-mc -filetype=obj -triple=x86_64-windows sym2.s -o sym2.obj
RUN: llvm-mc -filetype=obj -triple=x86_64-windows def.s -o def.obj

RUN: not lld-link -machine:amd64 -dll -noentry -out:test.dll test.obj sym2.obj 2>&1 | FileCheck -check-prefix=ERR %s

ERR:      error: undefined symbol: testsym
ERR-NEXT: >>> referenced by test.obj
ERR-EMPTY:
ERR-NEXT: error: undefined symbol: sym1
ERR-NEXT: >>> referenced by test.obj
ERR-NEXT: >>> referenced by sym2.obj
ERR-EMPTY:
ERR-NEXT: error: undefined symbol: sym2
ERR-NEXT: >>> referenced by test.obj
ERR-NEXT: >>> referenced by sym2.obj

Depending on symbol processing order, we may have temporary weak reference cycles:

RUN: lld-link -machine:amd64 -dll -noentry -out:test.dll test.obj sym2.obj def.obj
RUN: lld-link -machine:amd64 -dll -noentry -out:test.dll test.obj def.obj sym2.obj
RUN: lld-link -machine:amd64 -dll -noentry -out:test.dll def.obj test.obj sym2.obj

#--- test.s
    .weak testsym
.set testsym, sym1
    .weak sym1
.set sym1, sym2

#--- sym2.s
    .weak sym2
.set sym2, sym1

#--- def.s
    .globl sym1
    .data
sym1:
    .word 0