--- /dev/null
+; RUN: llvm-as -function-summary %s -o %t.o
+; RUN: llvm-as -function-summary %p/Inputs/thinlto_linkonceresolution.ll -o %t2.o
+
+; Ensure the plugin ensures that for ThinLTO the prevailing copy of a
+; linkonce symbol is changed to weak to ensure it is not eliminated.
+; Note that gold picks the first copy of f() as the prevailing one,
+; so listing %t2.o first is sufficient to ensure that this copy is
+; preempted. Also, set the import-instr-limit to 0 to prevent f() from
+; being imported from %t2.o which hides the problem.
+; RUN: %gold -plugin %llvmshlibdir/LLVMgold.so \
+; RUN: --plugin-opt=thinlto \
+; RUN: --plugin-opt=-import-instr-limit=0 \
+; RUN: --plugin-opt=save-temps \
+; RUN: -o %t3.o %t2.o %t.o
+; RUN: llvm-nm %t3.o | FileCheck %s
+; RUN: llvm-dis %t.o.opt.bc -o - | FileCheck --check-prefix=OPT %s
+; RUN: llvm-dis %t2.o.opt.bc -o - | FileCheck --check-prefix=OPT2 %s
+
+; Ensure that f() is defined in resulting object file, and also
+; confirm the weak linkage directly in the saved opt bitcode files.
+; CHECK-NOT: U f
+; OPT: declare extern_weak hidden void @f()
+; OPT2: define weak_odr hidden void @f()
+
+target triple = "x86_64-unknown-linux-gnu"
+define i32 @g() {
+ call void @f()
+ ret i32 0
+}
+define linkonce_odr hidden void @f() {
+ ret void
+}
if (Resolution == LDPR_PREVAILING_DEF_IRONLY_EXP && !Res.IsLinkonceOdr)
Resolution = LDPR_PREVAILING_DEF;
+ // In ThinLTO mode change all prevailing resolutions to LDPR_PREVAILING_DEF.
+ // For ThinLTO the IR files are compiled through the backend independently,
+ // so we need to ensure that any prevailing linkonce copy will be emitted
+ // into the object file by making it weak. Additionally, we can skip the
+ // IRONLY handling for internalization, which isn't performed in ThinLTO
+ // mode currently anyway.
+ if (options::thinlto && (Resolution == LDPR_PREVAILING_DEF_IRONLY_EXP ||
+ Resolution == LDPR_PREVAILING_DEF_IRONLY))
+ Resolution = LDPR_PREVAILING_DEF;
+
GV->setUnnamedAddr(Res.UnnamedAddr);
GV->setVisibility(Res.Visibility);