diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -243,6 +243,7 @@
 LANGOPT(OpenMPCUDAReductionBufNum , 32, 1024, "Number of the reduction records in the intermediate reduction buffer used for the teams reductions.")
 LANGOPT(OpenMPTargetNewRuntime , 1, 0, "Use the new bitcode library for OpenMP offloading")
 LANGOPT(OpenMPOptimisticCollapse  , 1, 0, "Use at most 32 bits to represent the collapsed loop nest counter.")
+LANGOPT(OpenMPSkipDeferredDiags,  1, 0, "Do not generate deferred diagnostics for function host/device availability.")
 LANGOPT(RenderScript      , 1, 0, "RenderScript")
 
 LANGOPT(CUDAIsDevice      , 1, 0, "compiling for CUDA device")
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -5799,6 +5799,8 @@
   HelpText<"Generate code only for an OpenMP target device.">;
 def fopenmp_host_ir_file_path : Separate<["-"], "fopenmp-host-ir-file-path">,
   HelpText<"Path to the IR file produced by the frontend for the host.">;
+def fopenmp_skip_deferred_diags : Flag<["-"], "fopenmp-skip-deferred-diags">,
+  HelpText<"Do not generate deferred diagnostics for function host/device availability. Use this flag only when no offloading or omp target directive is used.">;
 
 //===----------------------------------------------------------------------===//
 // SYCL Options
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -3489,6 +3489,9 @@
   if (Opts.OpenMPCUDAForceFullRuntime)
     GenerateArg(Args, OPT_fopenmp_cuda_force_full_runtime, SA);
 
+  if (Opts.OpenMPSkipDeferredDiags)
+    GenerateArg(Args, OPT_fopenmp_skip_deferred_diags, SA);
+
   // The arguments used to set Optimize, OptimizeSize and NoInlineDefine are
   // generated from CodeGenOptions.
 
@@ -3928,6 +3931,10 @@
       Opts.OpenMPIsDevice && (T.isNVPTX() || T.isAMDGCN()) &&
       Args.hasArg(options::OPT_fopenmp_cuda_force_full_runtime);
 
+  Opts.OpenMPSkipDeferredDiags =
+      Opts.OpenMP && !Opts.OpenMPSimd && !IsTargetSpecified &&
+      Args.hasArg(options::OPT_fopenmp_skip_deferred_diags);
+
   // FIXME: Eliminate this dependency.
   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
        OptSize = getOptimizationLevelSize(Args);
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -12609,7 +12609,8 @@
     VDecl->setInitStyle(VarDecl::ListInit);
   }
 
-  if (LangOpts.OpenMP && VDecl->isFileVarDecl())
+  if (LangOpts.OpenMP && !LangOpts.OpenMPSkipDeferredDiags &&
+      VDecl->isFileVarDecl())
     DeclsToCheckForDeferredDiags.insert(VDecl);
   CheckCompleteVariableDeclaration(VDecl);
 }
@@ -14839,7 +14840,8 @@
     DiscardCleanupsInEvaluationContext();
   }
 
-  if (FD && (LangOpts.OpenMP || LangOpts.CUDA || LangOpts.SYCLIsDevice)) {
+  if (FD && ((LangOpts.OpenMP && !LangOpts.OpenMPSkipDeferredDiags) ||
+             LangOpts.CUDA || LangOpts.SYCLIsDevice)) {
     auto ES = getEmissionStatus(FD);
     if (ES == Sema::FunctionEmissionStatus::Emitted ||
         ES == Sema::FunctionEmissionStatus::Unknown)
diff --git a/clang/test/OpenMP/declare_target_messages.cpp b/clang/test/OpenMP/declare_target_messages.cpp
--- a/clang/test/OpenMP/declare_target_messages.cpp
+++ b/clang/test/OpenMP/declare_target_messages.cpp
@@ -6,6 +6,9 @@
 // RUN: %clang_cc1 -triple x86_64-apple-macos10.7.0 -verify=expected,omp5,host5 -fopenmp-simd -fopenmp-is-device -fnoopenmp-use-tls -ferror-limit 100 -o - %s
 // RUN: %clang_cc1 -triple x86_64-apple-macos10.7.0 -verify=expected,omp45 -fopenmp-version=45 -fopenmp-simd -fnoopenmp-use-tls -ferror-limit 100 -o - %s
 
+// RUN: %clang_cc1 -triple x86_64-apple-macos10.7.0 -verify=expected,omp5,dev5 -fopenmp -fopenmp-is-device -fopenmp-targets=x86_64-apple-macos10.7.0 -aux-triple x86_64-apple-macos10.7.0 -fnoopenmp-use-tls -fopenmp-skip-deferred-diags -ferror-limit 100 -o - %s
+// RUN: %clang_cc1 -triple x86_64-apple-macos10.7.0 -verify=expected,omp5,host5 -fopenmp-simd -fopenmp-is-device -fnoopenmp-use-tls -fopenmp-skip-deferred-diags -ferror-limit 100 -o - %s
+// RUN: %clang_cc1 -triple x86_64-apple-macos10.7.0 -verify=expected,omp5 -fopenmp -fnoopenmp-use-tls -fopenmp-skip-deferred-diags -ferror-limit 100 -o - %s
 #pragma omp end declare target // expected-error {{unexpected OpenMP directive '#pragma omp end declare target'}}
 
 int a, b, z; // omp5-error {{variable captured in declare target region must appear in a to clause}}