[Bug c++/55319] Using -fwhole-program inhibits optimization

[m101010a at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55319

--- Comment #2 from m101010a at gmail dot com 2012-11-18 22:13:23 UTC ---
Actually, it does depend on IO; the optimizations aren't performed in either
case if I declare but don't define putchar, and if do something simple like
assigning to a volatile int in putchar then the optimizations are performed in
both cases.  If I assert(false) in putchar, gcc optimizes the fwhole-program
version to a failed assert, but doesn't without fwhole-program, which is the
opposite of what it does with IO.