Experimental Physics and
Industrial Control System

"Denison, PN \(Peter\)" <[email protected]> · Wed, 13 Jul 2005 14:53:49 +0100

On a linux-x86 target, shared libraries are built slightly differently
under R3.14.7 than under R3.14.6.

--- base-3.14.6/configure/os/CONFIG.linux-x86.linux-x86
+++ base-3.14.7/configure/os/CONFIG.linux-x86.linux-x86
@@ -19,6 +19,6 @@
 STATIC_LDLIBS_YES= -Wl,-Bdynamic
 STATIC_LDLIBS_NO=
  
-SHRLIB_LDFLAGS +=  -shared -z defs
-LOADABLE_SHRLIB_LDFLAGS = -shared
+SHRLIB_LDFLAGS +=  -shared -fPIC
+LOADABLE_SHRLIB_LDFLAGS = -shared -fPIC
  

Can anyone tell me the reasoning behind this change, and whether there
would be lots of breakage in 3.14.6 if I were to change '-z defs' to
'-fPIC'?

-z defs is safer, checking that there are no undefined symbols, at the
expense of needing all the libraries available at link time, rather than
run-time.

Peter Denison, Senior Software Engineer
Diamond Light Source Ltd., Diamond House, Chilton, Didcot, Oxon, OX11
0DE
Tel: +44 1235 778511

