From f35708d2e0ccd8890d2b3bca4b0b50a53accf847 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Sat, 10 Dec 2011 19:30:36 +0100
Subject: enforce weak linking of xerbla

---
 blas/xerbla.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'blas')

diff --git a/blas/xerbla.cpp b/blas/xerbla.cpp
index bda1d2f46..0d57710fe 100644
--- a/blas/xerbla.cpp
+++ b/blas/xerbla.cpp
@@ -1,12 +1,18 @@
 
 #include <iostream>
 
+#if (defined __GNUC__)
+#define EIGEN_WEAK_LINKING __attribute__ ((weak))
+#else
+#define EIGEN_WEAK_LINKING
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
-int xerbla_(const char * msg, int *info, int)
+EIGEN_WEAK_LINKING int xerbla_(const char * msg, int *info, int)
 {
   std::cerr << "Eigen BLAS ERROR #" << *info << ": " << msg << "\n";
   return 0;
-- 
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