From: Denis Davydov <davydden@gmail.com>
Date: Thu, 17 Sep 2015 20:33:24 +0000 (+0200)
Subject: disable PArpack if scalapack is present in Trilinos or PETSc link interface to avoid... 
X-Git-Tag: v8.4.0-rc2~396^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70d5c540b4df39918b0a7fbc6a096fbcafee640a;p=dealii.git

disable PArpack if scalapack is present in Trilinos or PETSc link interface to avoid possible symbol clash
---

diff --git a/cmake/configure/configure_arpack.cmake b/cmake/configure/configure_arpack.cmake
index 206b0cc491..fa0e4499d4 100644
--- a/cmake/configure/configure_arpack.cmake
+++ b/cmake/configure/configure_arpack.cmake
@@ -20,4 +20,4 @@
 SET(FEATURE_ARPACK_DEPENDS LAPACK)
 
 CONFIGURE_FEATURE(ARPACK)
-SET(DEAL_II_ARPACK_WITH_PARPACK ARPACK_WITH_PARPACK)
+SET(DEAL_II_ARPACK_WITH_PARPACK ${ARPACK_WITH_PARPACK})
diff --git a/cmake/modules/FindARPACK.cmake b/cmake/modules/FindARPACK.cmake
index b15a4c722a..f8e26eb1f9 100644
--- a/cmake/modules/FindARPACK.cmake
+++ b/cmake/modules/FindARPACK.cmake
@@ -52,6 +52,25 @@ ELSE()
   SET(PARPACK_LIBRARY "PARPACK_LIBRARY-NOTFOUND")
 ENDIF()
 
+IF(NOT DEAL_II_ARPACK_WITH_PARPACK)
+  #
+  # We have to avoid an unfortuante symbol clash with "libscalapack.so" -
+  # arpack happened to blindly copy a symbol name...
+  #   https://github.com/opencollab/arpack-ng/issues/18
+  #   https://github.com/opencollab/arpack-ng/pull/21
+  #
+  # Just disable parpack support if scalapack is present in Trilinos' or
+  # PETSc's link interface. This can be overridden by manually setting
+  # DEAL_II_ARPACK_WITH_PARPACK to true.
+  #
+  FOREACH(_libraries ${TRILINOS_LIBRARIES} ${PETSC_LIBRARIES})
+    IF("${_libraries}" MATCHES "scalapack")
+      SET(PARPACK_LIBRARY "PARPACK_LIBRARY-NOTFOUND")
+    ENDIF()
+  ENDFOREACH()
+ENDIF()
+
+
 IF(NOT PARPACK_LIBRARY MATCHES "-NOTFOUND")
   SET(ARPACK_WITH_PARPACK TRUE)
 ELSE()