From 010d00be01b7b46e8575148d32e5e13cae792c2a Mon Sep 17 00:00:00 2001
From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Mon, 6 Feb 2012 11:04:20 +0000
Subject: [PATCH] Work around a problem on Bluegene systems.

git-svn-id: https://svn.dealii.org/trunk@24994 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/configure          |  7 +++++++
 deal.II/configure.in       | 11 +++++++++++
 deal.II/doc/news/changes.h |  6 ++++++
 3 files changed, 24 insertions(+)

diff --git a/deal.II/configure b/deal.II/configure
index 7ea06b6a69..0e30175592 100755
--- a/deal.II/configure
+++ b/deal.II/configure
@@ -10012,6 +10012,13 @@ $as_echo "#define DEAL_II_HAVE_DARWIN_DYNACAST_BUG 1" >>confdefs.h
     ibm_xlc* )
            SHLIBFLAGS="-qmkshrobj"
 	   ;;
+
+    gcc*)
+                                                       case "$target" in
+             *powerpc* )
+                  SHLIBFLAGS="$SHLIBFLAGS -Wl,--relax"
+                  ;;
+           ;;
   esac
 
 
diff --git a/deal.II/configure.in b/deal.II/configure.in
index e3ae8efc96..b277bb00a6 100644
--- a/deal.II/configure.in
+++ b/deal.II/configure.in
@@ -360,6 +360,17 @@ if test "x$enableshared" = "xyes" ; then
     ibm_xlc* )
            SHLIBFLAGS="-qmkshrobj"
 	   ;;
+
+    gcc*)
+           dnl When using GCC on PowerPC (e.g. on BlueGene systems) we
+           dnl get errors from the linker about relocations that have be
+           dnl truncated to fit. Passing --relax to the linker helps in
+           dnl these cases.
+           case "$target" in
+             *powerpc* )
+                  SHLIBFLAGS="$SHLIBFLAGS -Wl,--relax"
+                  ;;
+           ;;
   esac
 
   dnl See if we can use -Wl,-soname,... for linking
diff --git a/deal.II/doc/news/changes.h b/deal.II/doc/news/changes.h
index b63d73834a..06441b12dc 100644
--- a/deal.II/doc/news/changes.h
+++ b/deal.II/doc/news/changes.h
@@ -34,6 +34,12 @@ inconvenience this causes.
 <h3>General</h3>
 
 <ol>
+<li> Fixed: Linking shared libraries on PowerPC systems (e.g. on
+BlueGene systems) failed due to a miscommunication between compiler
+and linker. This is now worked around.
+<br>
+(Aron Ahmedia, Wolfgang Bangerth, 2012/02/06)
+
 <li> New: There is now a distributed deal.II vector class
 parallel::distributed::Vector<Number> that can be used with MPI. The
 vector is based on a contiguous locally owned range and allows easy
-- 
2.39.5