[Bug middle-end/28831] [4.6/4.7/4.8 Regression] Aggregate copy not elided when using a return value as a pass-by-value parameter

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28831

--- Comment #20 from H.J. Lu <hjl.tools at gmail dot com> 2012-08-18 16:10:43 
UTC ---
With -maccumulate-outgoing-args, GCC 3.4 will also make
a copy.