[llvm-bugs] [Bug 27044] New: Corner case with linkonce and comdat still broken

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27044

            Bug ID: 27044
           Summary: Corner case with linkonce and comdat still broken
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Linker
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Running llvm-link with

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define i32 @f1() {
  ret i32 0
}

and

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
$foo = comdat any
define linkonce_odr i32 @f1() comdat($foo) {
  ret i32 1
}
define void @f2() comdat($foo) {
  ret void
}


produces

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
$foo = comdat any
define void @f2() comdat($foo) {
  ret void
}
define linkonce_odr i32 @f1() comdat($foo) {
  ret i32 1
}

Which has the incorrect @f1.

The ELF lld gets this right:

ld.lld -m elf_x86_64 -shared a.bc b.bc -o t.so -save-temps 


produces

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
$foo = comdat any
define i32 @f1() {
  ret i32 0
}
define void @f2() comdat($foo) {
  ret void
}

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