test/Linker/comdat-refer-to-discarded.ll

; RUN: rm -rf %t && split-file %s %t
; RUN: llvm-link -S %t/1.ll %t/1-aux.ll -o - | FileCheck %s

;--- 1.ll
; In 1-aux.ll a function not in the $foo comdat (zed) references an
; internal function in the comdat $foo.
; The IR would be ilegal on ELF ("relocation refers to discarded section"),
; but COFF linkers seem to just duplicate the comdat.

$foo = comdat any
@foo = internal global i8 0, comdat
define ptr @bar() {
       ret ptr @foo
}

; CHECK: $foo = comdat any

; CHECK: @foo = internal global i8 0, comdat
; CHECK: @foo.1 = internal global i8 1, comdat($foo)

; CHECK:      define ptr @bar() {
; CHECK-NEXT:   ret ptr @foo
; CHECK-NEXT: }

; CHECK:      define ptr @zed() {
; CHECK-NEXT:   call void @bax()
; CHECK-NEXT:   ret ptr @foo.1
; CHECK-NEXT: }

; CHECK:      define internal void @bax() comdat($foo) {
; CHECK-NEXT:   ret void
; CHECK-NEXT: }

;--- 1-aux.ll
$foo = comdat any
@foo = internal global i8 1, comdat
define ptr @zed() {
  call void @bax()
  ret ptr @foo
}
define internal void @bax() comdat($foo) {
  ret void
}