[Driver] Consider -fno-sanitize=... state when filtering out -fsanitize-coverage=...

petrhosek · petrhosek · commit eb4127ffb5c4 · 2017-07-21T01:17:49.000Z
The driver ignores -fsanitize-coverage=... flags when also given -fsanitize=... flags for sanitizer flavors that don't support the coverage runtime. This logic failed to account for subsequent -fno-sanitize=... flags that disable the sanitizer flavors that conflict with -fsanitize-coverage=... flags. Patch by Roland McGrath Differential Revision: https://reviews.llvm.org/D35603 llvm-svn: 308707
diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
@@ -504,7 +504,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
 
       // Disable coverage and not claim the flags if there is at least one
       // non-supporting sanitizer.
-      if (!(AllAddedKinds & ~setGroupBits(SupportsCoverage))) {
+      if (!(AllAddedKinds & ~AllRemove & ~setGroupBits(SupportsCoverage))) {
         Arg->claim();
       } else {
         CoverageFeatures = 0;
diff --git a/clang/test/Driver/fsanitize-coverage.c b/clang/test/Driver/fsanitize-coverage.c
@@ -95,3 +95,15 @@
 // CLANG-CL-COVERAGE-NOT: unknown argument
 // CLANG-CL-COVERAGE: -fsanitize-coverage-type=1
 // CLANG-CL-COVERAGE: -fsanitize=address
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=safe-stack -fsanitize-coverage=trace-pc-guard %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-VS-SAFESTACK
+// CHECK-VS-SAFESTACK: -fsanitize=safe-stack
+// CHECK-VS-SAFESTACK-NOT: -fsanitize-coverage-trace-pc-guard
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=safe-stack -fsanitize-coverage=trace-pc-guard -fno-sanitize=safe-stack %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-NO-SAFESTACK
+// CHECK-NO-SAFESTACK-NOT: error:
+// CHECK-NO-SAFESTACK-NOT: warning:
+// CHECK-NO-SAFESTACK-NOT: argument unused
+// CHECK-NO-SAFESTACK-NOT: unknown argument
+// CHECK-NO-SAFESTACK-NOT: -fsanitize=safe-stack
+// CHECK-NO-SAFESTACK: -fsanitize-coverage-trace-pc-guard
