------- Comment #2 from Daniel dot Davies at xerox dot com 2010-06-21 23:42
-------
Excellent! Here's where I must have gotten confused.
http://gcc.gnu.org/install/configure.html says
--enable-gold
Enable support for using gold as the linker. If gold support is enabled
together with --enable-lto, an additional directory lto-plugin will be built.
The code in this directory is a plugin for gold that allows the link-time
optimizer to extract object files with LTO information out of library archives.
See -flto and -fwhopr for details.
Since I have object files in library archive, I assumed that gold was required.
Two other hints: attempting to apply LTO to my large 32-bit application has
absolutely no effect on performance; and attempting to link a 64-bit version of
the same large application results in an error because the linker tries to link
in the 32-bit lto-plugin.so. I'm hoping that actually having gold available
will help, but perhaps that's just another mistake.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44621
