[OPENMP]Fix PR43355: DO not emit target calls if only -fopenmp-targets

is not provided.

We should not emit any target-dependent code if only -fopenmp flag is
used and device targets are not provided to prevent compiler crash.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@372623 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGOpenMPRuntime.cpp

@@ -2815,6 +2815,8 @@ llvm::Function *CGOpenMPRuntime::emitThreadPrivateVarDefinition(
 bool CGOpenMPRuntime::emitDeclareTargetVarDefinition(const VarDecl *VD,
                                                      llvm::GlobalVariable *Addr,
                                                      bool PerformInit) {
+  if (CGM.getLangOpts().OMPTargetTriples.empty())
+    return false;
   Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
       OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
   if (!Res || *Res == OMPDeclareTargetDeclAttr::MT_Link ||
@@ -9718,6 +9720,8 @@ CGOpenMPRuntime::registerTargetFirstprivateCopy(CodeGenFunction &CGF,
 
 void CGOpenMPRuntime::registerTargetGlobalVariable(const VarDecl *VD,
                                                    llvm::Constant *Addr) {
+  if (CGM.getLangOpts().OMPTargetTriples.empty())
+    return;
   llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
       OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
   if (!Res) {

test/OpenMP/declare_target_codegen.cpp

@@ -7,6 +7,15 @@
 // RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm-bc %s -o %t-ppc-host.bc -fopenmp-version=50 -DOMP5
 // RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - -fopenmp-version=50 -DOMP5 | FileCheck %s --check-prefix DEV5
 
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -o - -fopenmp-version=50 -DOMP5 | FileCheck %s --check-prefix KMPC-ONLY
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm-bc %s -o %t-ppc-host.bc -fopenmp-version=50 -DOMP5
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - -fopenmp-version=50 -DOMP5 | FileCheck %s --check-prefix KMPC-ONLY
+
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm-bc %s -o %t-ppc-host.bc
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o -| FileCheck %s --check-prefix KMPC-ONLY
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -emit-pch -o %t
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -include-pch %t -verify -o - | FileCheck %s --check-prefix KMPC-ONLY
+
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm %s -o - -fopenmp-version=50 -DOMP5 | FileCheck %s --check-prefix SIMD-ONLY
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm-bc %s -o %t-ppc-host.bc -fopenmp-version=50 -DOMP5
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - -fopenmp-version=50 -DOMP5 | FileCheck %s --check-prefix SIMD-ONLY
@@ -19,6 +28,7 @@
 // expected-no-diagnostics
 
 // SIMD-ONLY-NOT: {{__kmpc|__tgt}}
+// KMPC-ONLY-NOT: __tgt
 
 // CHECK-NOT: define {{.*}}{{baz1|baz4|maini1|Base|virtual_}}
 // CHECK-DAG: Bake