Enable additonal features in NetBSD

[krytarowski]

Summary

Enable for x86_64:

• ESan,
• KASan,
• MSan.

Enable for x86_64 and i386:

• Scudo.

These features are under active development and in various level of completeness.

Sponsored by <The NetBSD Foundation>

[dvyukov]

Evgenii, do you know what's the policy for enabling these flags?

[krytarowski]

In D40456#935139, @dvyukov wrote:

Evgenii, do you know what's the policy for enabling these flags?

In GCC they seem to be enabled always.

[eugenis]

In my opinion, they should be enabled always, but AFAIR people disagreed with me on this in the past.

[krytarowski]

D40464 related.

lib/Driver/ToolChains/NetBSD.cpp

SanitizerMask NetBSD::getSupportedSanitizers() const {
   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
   SanitizerMask Res = ToolChain::getSupportedSanitizers();
   if (IsX86 || IsX86_64) {
     Res |= SanitizerKind::Address;
     Res |= SanitizerKind::Function;
     Res |= SanitizerKind::Leak;
     Res |= SanitizerKind::SafeStack;
+    Res |= SanitizerKind::Scudo;
     Res |= SanitizerKind::Vptr;
   }
   if (IsX86_64) {
+    Res |= SanitizerKind::Efficiency;
     Res |= SanitizerKind::Fuzzer;
     Res |= SanitizerKind::FuzzerNoLink;
+    Res |= SanitizerKind::KernelAddress;
+    Res |= SanitizerKind::Memory;
     Res |= SanitizerKind::Thread;
   }
   return Res;
 }