From f410e6f21d7c4bfc71f4491abbe6b61ab35983d5 Mon Sep 17 00:00:00 2001
From: maier <maier@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Mon, 1 Apr 2013 08:26:59 +0000
Subject: [PATCH] CMake: *sigh*

git-svn-id: https://svn.dealii.org/trunk@29133 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/cmake/configure/configure_1_lapack.cmake | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/deal.II/cmake/configure/configure_1_lapack.cmake b/deal.II/cmake/configure/configure_1_lapack.cmake
index 9f42e5da40..6edae73c7e 100644
--- a/deal.II/cmake/configure/configure_1_lapack.cmake
+++ b/deal.II/cmake/configure/configure_1_lapack.cmake
@@ -48,6 +48,15 @@ SET(DEAL_II_LAPACK_FUNCTIONS
 
 MACRO(CHECK_FOR_LAPACK_FUNCTIONS)
   SET(CMAKE_REQUIRED_LIBRARIES ${LAPACK_LIBRARIES})
+  #
+  # For some static lapack versions it is necessary to link with -lm.
+  # So link with it as well if -lm is already present in our link
+  # interface:
+  #
+  IF(NOT m_lib MATCHES "-NOTFOUND")
+    LIST(APPEND CMAKE_REQUIRED_LIBRARIES ${m_lib})
+  ENDIF()
+
   ADD_FLAGS(CMAKE_REQUIRED_FLAGS "${LAPACK_LINKER_FLAGS}")
 
   FOREACH(_func ${DEAL_II_LAPACK_FUNCTIONS})
-- 
2.39.5