--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lld/test/COFF/thinlto-index-only.ll	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,63 @@
+; REQUIRES: x86
+
+; Basic ThinLTO tests.
+; RUN: opt -thinlto-bc %s -o %t1.obj
+; RUN: opt -thinlto-bc %p/Inputs/thinlto.ll -o %t2.obj
+; RUN: opt -thinlto-bc %p/Inputs/thinlto-empty.ll -o %t3.obj
+
+; Ensure lld generates an index and not a binary if requested.
+; RUN: rm -f %t4.exe
+; RUN: lld-link -thinlto-index-only -entry:main %t1.obj %t2.obj -out:%t4.exe
+; RUN: llvm-bcanalyzer -dump %t1.obj.thinlto.bc | FileCheck %s --check-prefix=BACKEND1
+; RUN: llvm-bcanalyzer -dump %t2.obj.thinlto.bc | FileCheck %s --check-prefix=BACKEND2
+; RUN: not test -e %t4.exe
+
+; The backend index for this module contains summaries from itself and
+; Inputs/thinlto.ll, as it imports from the latter.
+; BACKEND1: <MODULE_STRTAB_BLOCK
+; BACKEND1-NEXT: <ENTRY {{.*}} record string = '{{.*}}thinlto-index-only.ll.tmp{{.*}}.obj'
+; BACKEND1: <ENTRY {{.*}} record string = '{{.*}}thinlto-index-only.ll.tmp{{.*}}.obj'
+; BACKEND1-NOT: <ENTRY
+; BACKEND1: </MODULE_STRTAB_BLOCK
+; BACKEND1: <GLOBALVAL_SUMMARY_BLOCK
+; BACKEND1: <VERSION
+; BACKEND1: <FLAGS
+; BACKEND1: <VALUE_GUID op0={{1|2}} op1={{-5300342847281564238|-2624081020897602054}}
+; BACKEND1: <VALUE_GUID op0={{1|2}} op1={{-5300342847281564238|-2624081020897602054}}
+; BACKEND1: <COMBINED
+; BACKEND1: <COMBINED
+; BACKEND1: </GLOBALVAL_SUMMARY_BLOCK
+
+; The backend index for Input/thinlto.ll contains summaries from itself only,
+; as it does not import anything.
+; BACKEND2: <MODULE_STRTAB_BLOCK
+; BACKEND2-NEXT: <ENTRY {{.*}} record string = '{{.*}}thinlto-index-only.ll.tmp2.obj'
+; BACKEND2-NOT: <ENTRY
+; BACKEND2: </MODULE_STRTAB_BLOCK
+; BACKEND2-NEXT: <GLOBALVAL_SUMMARY_BLOCK
+; BACKEND2-NEXT: <VERSION
+; BACKEND2-NEXT: <FLAGS
+; BACKEND2-NEXT: <VALUE_GUID op0=1 op1=-5300342847281564238
+; BACKEND2-NEXT: <COMBINED
+; BACKEND2-NEXT: </GLOBALVAL_SUMMARY_BLOCK
+
+; Thin archive tests. Check that the module paths point to the original files.
+; RUN: rm -rf %t
+; RUN: mkdir %t
+; RUN: opt -thinlto-bc -o %t/foo.obj < %s
+; RUN: opt -thinlto-bc -o %t/bar.obj < %p/Inputs/thinlto.ll
+; RUN: llvm-ar rcsT %t5.lib %t/bar.obj %t3.obj
+; RUN: lld-link -thinlto-index-only -entry:main %t/foo.obj %t5.lib
+; RUN: llvm-dis -o - %t/foo.obj.thinlto.bc | FileCheck %s --check-prefix=THINARCHIVE
+; THINARCHIVE: ^0 = module: (path: "{{.*}}foo.obj",
+; THINARCHIVE: ^1 = module: (path: "{{.*}}bar.obj",
+
+target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc19.0.24215"
+
+declare void @g(...)
+
+define void @main() {
+  call void (...) @g()
+  ret void
+}