Limit the template instantiation depth to some user-configurable value

(default: 99). Beyond this limit, produce an error and consider the
current template instantiation a failure.

The stack we're building to track the instantiations will, eventually,
be used to produce instantiation backtraces from diagnostics within
template instantiation. However, we're not quite there yet.

This adds a new Clang driver option -ftemplate-depth=NNN, which should
eventually be generated from the GCC command-line operation
-ftemplate-depth-NNN (note the '-' rather than the '='!). I did not
make the driver changes to do this mapping.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66513 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/include/clang/Basic/LangOptions.h b/include/clang/Basic/LangOptions.h
index 0124b04aa9..fcfe0ca1e9 100644
--- a/include/clang/Basic/LangOptions.h
+++ b/include/clang/Basic/LangOptions.h
@@ -62,6 +62,7 @@ private:
                    // this enum as unsigned because MSVC insists on making enums
                    // signed.  Set/Query this value using accessors.  
 public:  
+  unsigned InstantiationDepth;    // Maximum template instantiation depth.
 
   enum GCMode { NonGC, GCOnly, HybridGC };
   
@@ -80,6 +81,8 @@ public:
     Blocks = 0;
     EmitAllDecls = 0;
     MathErrno = 1;
+
+    InstantiationDepth = 99;
   }
   
   GCMode getGCMode() const { return (GCMode) GC; }