2 files changed, 65 insertions, 0 deletions
diff --git a/llvm/test/LTO/Resolution/X86/Inputs/comdat-mixed-lto.ll b/llvm/test/LTO/Resolution/X86/Inputs/comdat-mixed-lto.ll
new file mode 100644
index 00000000000..0112b89f98d
--- /dev/null
+++ b/llvm/test/LTO/Resolution/X86/Inputs/comdat-mixed-lto.ll
@@ -0,0 +1,23 @@
+; ModuleID = 'comdat-mixed-lto1.o'
+source_filename = "comdat-mixed-lto1.cpp"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%"class.Test::ptr" = type { i32 }
+
+$C = comdat any
+
+@C = linkonce_odr global %"class.Test::ptr" zeroinitializer, comdat, align 4
+@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @__cxx_global_var_init, i8* bitcast (%"class.Test::ptr"* @C to i8*) }]
+
+define void @testglobfunc() #1 section ".text.startup" comdat($C) {
+entry:
+  ret void
+}
+
+; Function Attrs: noinline uwtable
+define internal void @__cxx_global_var_init() #1 section ".text.startup" comdat($C) {
+entry:
+  store i32 0, i32* getelementptr inbounds (%"class.Test::ptr", %"class.Test::ptr"* @C, i32 0, i32 0), align 4
+  ret void
+}
diff --git a/llvm/test/LTO/Resolution/X86/comdat-mixed-lto.ll b/llvm/test/LTO/Resolution/X86/comdat-mixed-lto.ll
new file mode 100644
index 00000000000..f6ee22e4161
--- /dev/null
+++ b/llvm/test/LTO/Resolution/X86/comdat-mixed-lto.ll
@@ -0,0 +1,42 @@
+; Test of comdat handling with mixed thinlto and regular lto compilation.
+
+; This module is compiled with ThinLTO
+; RUN: opt -module-summary -o %t1.o %s
+; Input module compiled for regular LTO
+; RUN: opt -o %t2.o %p/Inputs/comdat-mixed-lto.ll
+
+; The copy of C from this module is prevailing. The copy of C from the
+; regular LTO module is not prevailing, and will be dropped to
+; available_externally.
+; RUN: llvm-lto2 run -r=%t1.o,C,pl -r=%t2.o,C,l -r=%t2.o,testglobfunc,lxp -r=%t1.o,testglobfunc,lx -o %t3 %t1.o %t2.o -save-temps
+
+; The Input module (regular LTO) is %t3.0. Check to make sure that we removed
+; __cxx_global_var_init and testglobfunc from comdat. Also check to ensure
+; that testglobfunc was dropped to available_externally. Otherwise we would
+; have linker multiply defined errors as it is no longer in a comdat and
+; would clash with the copy from this module.
+; RUN: llvm-dis %t3.0.0.preopt.bc -o - | FileCheck %s
+; CHECK: define internal void @__cxx_global_var_init() section ".text.startup" {
+; CHECK: define available_externally void @testglobfunc() section ".text.startup" {
+
+; ModuleID = 'comdat-mixed-lto.o'
+source_filename = "comdat-mixed-lto.cpp"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%"class.Test::ptr" = type { i32 }
+
+$C = comdat any
+
+@C = linkonce_odr global %"class.Test::ptr" zeroinitializer, comdat, align 4
+@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @__cxx_global_var_init, i8* bitcast (%"class.Test::ptr"* @C to i8*) }]
+define void @testglobfunc() #1 section ".text.startup" comdat($C) {
+entry:
+  ret void
+}
+
+; Function Attrs: noinline uwtable
+define internal void @__cxx_global_var_init() #1 section ".text.startup" comdat($C) {
+entry:
+  ret void
+}