LINKER_USE_RPATH=ORIGIN

Use Linux specific linker trick to allow relocation
of built tree.

relative rpath

use $ORIGIN to reference libraries in other modules
by relative path.

fix rel. RPATH

src/tools/makeRPath.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+
+import sys
+import os
+
+from argparse import ArgumentParser
+
+if os.environ.get('EPICS_DEBUG_RPATH','')=='YES':
+    sys.stderr.write('%s'%sys.argv)
+
+P = ArgumentParser()
+P.add_argument('-F','--final',default=os.getcwd(), help='Final install location for ELF file')
+P.add_argument('-R','--root',default='/')
+P.add_argument('-O', '--origin', default='$ORIGIN')
+P.add_argument('path', nargs='*')
+args = P.parse_args()
+
+fdir = os.path.abspath(args.final)
+
+output = []
+for path in args.path:
+    path = os.path.abspath(path)
+
+    if args.root and os.path.relpath(path, args.root).startswith('../'):
+        pass # absolute rpath
+    else:
+        path = os.path.relpath(path, fdir)
+
+    output.append('-Wl,-rpath,'+os.path.join(args.origin, path))
+
+print(' '.join(output))