py-cffi: set LDSHARED env so that rpath is set

py-cffi's .so was being built without the rpath being set.  distutils
looks at the LDSHARED for which compiler to use to build the final .so.
Since it was not set, distutils fell back to the system provided
compiler.  Setting it forces the shared library to be compiled with the
spack compiler (meaning that the rpath is set correctly).

1 files changed, 10 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/py-cffi/package.py b/var/spack/repos/builtin/packages/py-cffi/package.py
index 3c1044783f..7c08e51de8 100644
--- a/var/spack/repos/builtin/packages/py-cffi/package.py
+++ b/var/spack/repos/builtin/packages/py-cffi/package.py
@@ -22,6 +22,8 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
+import os
+
 from spack import *
 
 
@@ -39,4 +41,12 @@ class PyCffi(Package):
     depends_on('libffi')
 
     def install(self, spec, prefix):
+        # This sets the compiler (and flags) that distutils will use
+        # to create the final shared library.  It will use the
+        # compiler specified by the environment variable 'CC' for all
+        # other compilation.  We are setting the 'LDSHARED" to the
+        # spack compiler wrapper plus a few extra flags necessary for
+        # building the shared library.
+        os.environ['LDSHARED'] = "{0} -shared -pthread".format(spack_cc)
+
         python('setup.py', 'install', '--prefix=%s' % prefix)