Add a -fuse-init-array option to cc1 and map to the UseInitArray target

option. On the driver, check if we are using libraries from gcc 4.7 or newer
and if so pass -fuse-init-array to the frontend.
The crtbegin*.o files in gcc 4.7 no longer call the constructors listed in
.ctors, so we have to use .init_array.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158694 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/include/clang/Frontend/CodeGenOptions.h b/include/clang/Frontend/CodeGenOptions.h
index be7f03fe13..6c77e424e7 100644
--- a/include/clang/Frontend/CodeGenOptions.h
+++ b/include/clang/Frontend/CodeGenOptions.h
@@ -118,6 +118,8 @@ public:
 
   unsigned StackRealignment  : 1; ///< Control whether to permit stack
                                   ///< realignment.
+  unsigned UseInitArray      : 1; ///< Control whether to use .init_array or
+                                  ///< .ctors.
   unsigned StackAlignment;        ///< Overrides default stack alignment,
                                   ///< if not 0.
 
@@ -228,6 +230,7 @@ public:
     StackRealignment = 0;
     StackAlignment = 0;
     BoundsChecking = 0;
+    UseInitArray = 0;
 
     DebugInfo = NoDebugInfo;
     Inlining = NoInlining;