[PATCH] D92245: -fstack-clash-protection: Return an actual error when used on unsupported OS

[Sylvestre Ledru via Phabricator via cfe-commits]

sylvestre.ledru created this revision.
sylvestre.ledru added a reviewer: serge-sans-paille.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
sylvestre.ledru requested review of this revision.

$ clang-12: error: -fstack-clash-protection is not supported on Windows or Mac OS X


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92245

Files:
  clang/include/clang/Basic/DiagnosticDriverKinds.td
  clang/lib/Driver/ToolChains/Clang.cpp


Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3077,12 +3077,14 @@
   }
 }
 
-static void RenderSCPOptions(const ToolChain &TC, const ArgList &Args,
+static void RenderSCPOptions(const Driver &D, const ToolChain &TC, const ArgList &Args,
                              ArgStringList &CmdArgs) {
   const llvm::Triple &EffectiveTriple = TC.getEffectiveTriple();
 
-  if (!EffectiveTriple.isOSLinux())
+  if (EffectiveTriple.isOSWindows() || EffectiveTriple.isOSDarwin()) {
+    D.Diag(diag::err_drv_stack_clash_protection_unsupported_on_toolchain);
     return;
+  }
 
   if (!EffectiveTriple.isX86() && !EffectiveTriple.isSystemZ() &&
       !EffectiveTriple.isPPC64())
@@ -5551,7 +5553,7 @@
     CmdArgs.push_back(Args.MakeArgString("-mspeculative-load-hardening"));
 
   RenderSSPOptions(D, TC, Args, CmdArgs, KernelOrKext);
-  RenderSCPOptions(TC, Args, CmdArgs);
+  RenderSCPOptions(D, TC, Args, CmdArgs);
   RenderTrivialAutoVarInitOptions(D, TC, Args, CmdArgs);
 
   // Translate -mstackrealign
Index: clang/include/clang/Basic/DiagnosticDriverKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -273,6 +273,8 @@
     : Error<"%0 is not supported with -fembed-bitcode">;
 def err_drv_bitcode_unsupported_on_toolchain : Error<
   "-fembed-bitcode is not supported on versions of iOS prior to 6.0">;
+def err_drv_stack_clash_protection_unsupported_on_toolchain : Error<
+  "-fstack-clash-protection is not supported on Windows or Mac OS X">;
 
 def err_drv_invalid_malign_branch_EQ : Error<
   "invalid argument '%0' to -malign-branch=; each element must be one of: %1">;


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