From 2110cca4313ebb902ca1f4f6ff0c389f743e60fc Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Tue, 16 Dec 2008 15:44:48 +0000
Subject: [PATCH] actually honor EIGEN_STACK_ALLOCATION. Can set it to 0 to
 disable stack alloc which guarantees that bad alloc throws exceptions if they
 are enabled.

---
 Eigen/src/Core/util/Macros.h | 4 ++++
 Eigen/src/Core/util/Memory.h | 9 +++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index c95030524..274d59057 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -116,6 +116,10 @@ using Eigen::ei_cos;
 
 #define EIGEN_RESTRICT __restrict
 
+#ifndef EIGEN_STACK_ALLOCATION_LIMIT
+#define EIGEN_STACK_ALLOCATION_LIMIT 16000000
+#endif
+
 #ifndef EIGEN_DEFAULT_IO_FORMAT
 #define EIGEN_DEFAULT_IO_FORMAT Eigen::IOFormat()
 #endif
diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index 63f9a07fc..b09e11bd4 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -143,11 +143,12 @@ inline static int ei_alignmentOffset(const Scalar* ptr, int maxOffset)
   * \endcode
   */
 #ifdef __linux__
-# define ei_alloc_stack(TYPE,SIZE) ((sizeof(TYPE)*(SIZE)>16000000) ? new TYPE[SIZE] : (TYPE*)alloca(sizeof(TYPE)*(SIZE)))
-# define ei_free_stack(PTR,TYPE,SIZE) if (sizeof(TYPE)*SIZE>16000000) delete[] PTR
+  #define ei_alloc_stack(TYPE,SIZE) ((sizeof(TYPE)*(SIZE)>EIGEN_STACK_ALLOCATION_LIMIT) ? \
+                                    new TYPE[SIZE] : (TYPE*)alloca(sizeof(TYPE)*(SIZE)))
+  #define ei_free_stack(PTR,TYPE,SIZE) if (sizeof(TYPE)*SIZE>EIGEN_STACK_ALLOCATION_LIMIT) delete[] PTR
 #else
-# define ei_alloc_stack(TYPE,SIZE) new TYPE[SIZE]
-# define ei_free_stack(PTR,TYPE,SIZE) delete[] PTR
+  #define ei_alloc_stack(TYPE,SIZE) new TYPE[SIZE]
+  #define ei_free_stack(PTR,TYPE,SIZE) delete[] PTR
 #endif
 
 /** \class WithAlignedOperatorNew