add -fbounds-checking option.

When enabled, clang generates bounds checks for array and pointers dereferences. Work to follow in LLVM's backend.

OK'ed by Chad; thanks for the review.

llvm-svn: 156431

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 90a9f0cf947..1ccba755071 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -2025,6 +2025,15 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("-Wlarge-by-value-copy=64"); // default value
   }
 
+  if (Arg *A = Args.getLastArg(options::OPT_fbounds_checking,
+                               options::OPT_fbounds_checking_EQ)) {
+    if (A->getNumValues()) {
+      StringRef val = A->getValue(Args);
+      CmdArgs.push_back(Args.MakeArgString("-fbounds-checking=" + val));
+    } else
+      CmdArgs.push_back("-fbounds-checking=1");
+  }
+
   if (Args.hasArg(options::OPT__relocatable_pch))
     CmdArgs.push_back("-relocatable-pch");