Index: clang/lib/Parse/ParseOpenMP.cpp
===================================================================
--- clang/lib/Parse/ParseOpenMP.cpp
+++ clang/lib/Parse/ParseOpenMP.cpp
@@ -2708,7 +2708,8 @@
     return nullptr;
   SmallVector<Sema::UsesAllocatorsData, 4> Data;
   do {
-    ExprResult Allocator = ParseCXXIdExpression();
+    ExprResult Allocator =
+        getLangOpts().CPlusPlus ? ParseCXXIdExpression() : ParseExpression();
     if (Allocator.isInvalid()) {
       SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
                 StopBeforeMatch);
@@ -2720,7 +2721,8 @@
       BalancedDelimiterTracker T(*this, tok::l_paren,
                                  tok::annot_pragma_openmp_end);
       T.consumeOpen();
-      ExprResult AllocatorTraits = ParseCXXIdExpression();
+      ExprResult AllocatorTraits =
+          getLangOpts().CPlusPlus ? ParseCXXIdExpression() : ParseExpression();
       T.consumeClose();
       if (AllocatorTraits.isInvalid()) {
         SkipUntil(tok::comma, tok::r_paren, tok::annot_pragma_openmp_end,
Index: clang/test/OpenMP/target_uses_allocators.c
===================================================================
--- /dev/null
+++ clang/test/OpenMP/target_uses_allocators.c
@@ -0,0 +1,44 @@
+// Test host codegen.
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=50  -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix CHECK --check-prefix CHECK-64
+// RUN: %clang_cc1 -fopenmp -fopenmp-version=50 -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-pch -o %t %s
+// RUN: %clang_cc1 -fopenmp -fopenmp-version=50 -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu
+
+// expected-no-diagnostics
+#ifndef HEADER
+#define HEADER
+
+enum omp_allocator_handle_t {
+  omp_null_allocator = 0,
+  omp_default_mem_alloc = 1,
+  omp_large_cap_mem_alloc = 2,
+  omp_const_mem_alloc = 3,
+  omp_high_bw_mem_alloc = 4,
+  omp_low_lat_mem_alloc = 5,
+  omp_cgroup_mem_alloc = 6,
+  omp_pteam_mem_alloc = 7,
+  omp_thread_mem_alloc = 8,
+  KMP_ALLOCATOR_MAX_HANDLE = __UINTPTR_MAX__
+};
+
+// CHECK: define {{.*}}[[FIE:@.+]]()
+void fie() {
+  int x;
+  #pragma omp target uses_allocators(omp_null_allocator) allocate(omp_null_allocator: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_default_mem_alloc) allocate(omp_default_mem_alloc: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_large_cap_mem_alloc) allocate(omp_large_cap_mem_alloc: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_const_mem_alloc) allocate(omp_const_mem_alloc: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_high_bw_mem_alloc) allocate(omp_high_bw_mem_alloc: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_low_lat_mem_alloc) allocate(omp_low_lat_mem_alloc: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_cgroup_mem_alloc) allocate(omp_cgroup_mem_alloc: x) firstprivate(x)
+  {}
+  #pragma omp target uses_allocators(omp_pteam_mem_alloc) allocate(omp_pteam_mem_alloc: x) firstprivate(x)
+  {}
+}
+
+#endif