[Driver] Support for disabling sanitizer runtime linking

This change introduces a pair of -fsanitize-link-runtime and
-fno-sanitize-link-runtime flags which can be used to control linking of
sanitizer runtimes. This is useful in certain environments like kernels
where existing runtime libraries cannot be used.

Differential Revision: https://reviews.llvm.org/D65029

llvm-svn: 367794

1 files changed, 8 insertions, 2 deletions

diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index 6b6a9feec42..baf3554b4b4 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -824,9 +824,15 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
     SafeStackRuntime = !TC.getTriple().isOSFuchsia();
   }
 
+  LinkRuntimes =
+      Args.hasFlag(options::OPT_fsanitize_link_runtime,
+                   options::OPT_fno_sanitize_link_runtime, LinkRuntimes);
+
   // Parse -link-cxx-sanitizer flag.
-  LinkCXXRuntimes =
-      Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();
+  LinkCXXRuntimes = Args.hasArg(options::OPT_fsanitize_link_cxx_runtime,
+                                options::OPT_fno_sanitize_link_cxx_runtime,
+                                LinkCXXRuntimes) ||
+                    D.CCCIsCXX();
 
   // Finally, initialize the set of available and recoverable sanitizers.
   Sanitizers.Mask |= Kinds;