[PATCH] D153123: Fix diag for read-only target features

[Yaxun Liu via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGc8c583071591: Fix diag for read-only target features (authored by yaxunl).
Herald added a project: clang.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D153123/new/

https://reviews.llvm.org/D153123

Files:
  clang/lib/Basic/TargetInfo.cpp
  clang/lib/Basic/Targets.cpp
  clang/test/OpenMP/openmp-read-only-feature.c


Index: clang/test/OpenMP/openmp-read-only-feature.c
===================================================================
--- /dev/null
+++ clang/test/OpenMP/openmp-read-only-feature.c
@@ -0,0 +1,16 @@
+// REQUIRES: x86-registered-target
+// REQUIRES: amdgpu-registered-target
+// REQUIRES: clang-target-64-bits
+
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -target-cpu gfx1030 \
+// RUN:   -fopenmp -nogpulib -fopenmp-is-device -verify %s
+// expected-no-diagnostics
+
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -target-cpu gfx1030 \
+// RUN:   -fopenmp -nogpulib -target-feature -image-insts \
+// RUN:   -fopenmp-is-device -emit-llvm -S -o - %s 2>&1 | FileCheck %s
+// CHECK: warning: feature flag '-image-insts' is ignored since the feature is read only
+
+#pragma omp begin declare variant match(device = {arch(amdgcn)})
+void foo();
+#pragma omp end declare variant
Index: clang/lib/Basic/Targets.cpp
===================================================================
--- clang/lib/Basic/Targets.cpp
+++ clang/lib/Basic/Targets.cpp
@@ -42,6 +42,7 @@
 #include "Targets/X86.h"
 #include "Targets/XCore.h"
 #include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticFrontend.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/TargetParser/Triple.h"
 
@@ -816,6 +817,13 @@
 
   // Compute the default target features, we need the target to handle this
   // because features may have dependencies on one another.
+  llvm::erase_if(Opts->FeaturesAsWritten, [&](StringRef Name) {
+    if (Target->isReadOnlyFeature(Name.substr(1))) {
+      Diags.Report(diag::warn_fe_backend_readonly_feature_flag) << Name;
+      return true;
+    }
+    return false;
+  });
   if (!Target->initFeatureMap(Opts->FeatureMap, Diags, Opts->CPU,
                               Opts->FeaturesAsWritten))
     return nullptr;
Index: clang/lib/Basic/TargetInfo.cpp
===================================================================
--- clang/lib/Basic/TargetInfo.cpp
+++ clang/lib/Basic/TargetInfo.cpp
@@ -528,8 +528,6 @@
     // Apply the feature via the target.
     if (Name[0] != '+' && Name[0] != '-')
       Diags.Report(diag::warn_fe_backend_invalid_feature_flag) << Name;
-    else if (isReadOnlyFeature(Name.substr(1)))
-      Diags.Report(diag::warn_fe_backend_readonly_feature_flag) << Name;
     else
       setFeatureEnabled(Features, Name.substr(1), Name[0] == '+');
   }


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