[Driver] Enable SafeStack for Fuchsia targets

The runtime support is provided directly by the Fuchsia system C
library.

Patch by Roland McGrath

Differential Revision: https://reviews.llvm.org/D30238

llvm-svn: 296082

3 files changed, 13 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 533206e4061..495cc0a73b7 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -4860,6 +4860,12 @@ void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
   CmdArgs.push_back("-lunwind");
 }
 
+SanitizerMask Fuchsia::getSupportedSanitizers() const {
+  SanitizerMask Res = ToolChain::getSupportedSanitizers();
+  Res |= SanitizerKind::SafeStack;
+  return Res;
+}
+
 /// DragonFly - DragonFly tool chain which can call as(1) and ld(1) directly.
 
 DragonFly::DragonFly(const Driver &D, const llvm::Triple &Triple,
diff --git a/clang/lib/Driver/ToolChains.h b/clang/lib/Driver/ToolChains.h
index 8646efbf388..7810b76d1be 100644
--- a/clang/lib/Driver/ToolChains.h
+++ b/clang/lib/Driver/ToolChains.h
@@ -1095,6 +1095,8 @@ public:
     return llvm::DebuggerKind::GDB;
   }
 
+  SanitizerMask getSupportedSanitizers() const override;
+
   RuntimeLibType
   GetRuntimeLibType(const llvm::opt::ArgList &Args) const override;
   CXXStdlibType
diff --git a/clang/test/Driver/fuchsia.c b/clang/test/Driver/fuchsia.c
index 75172edf6b2..58c2bbe533c 100644
--- a/clang/test/Driver/fuchsia.c
+++ b/clang/test/Driver/fuchsia.c
@@ -38,3 +38,8 @@
 // CHECK-RELOCATABLE-NOT: "-pie"
 // CHECK-RELOCATABLE-NOT: "--build-id"
 // CHECK-RELOCATABLE: "-r"
+
+// RUN: %clang %s -### --target=x86_64-unknown-fuchsia \
+// RUN:     -fsanitize=safe-stack 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-SAFESTACK
+// CHECK-SAFESTACK: "-fsanitize=safe-stack"