Comment #4 on issue 2513 by [email protected]: Patch: Build: add -fno-tree-vrp to CXXFLAGS for gcc 4.7.0
http://code.google.com/p/lilypond/issues/detail?id=2513
"-O1 -ftree-vrp" makes the bad code."-O0 -ftree-vrp" doesn't. The assembly output for "-O0" and "-O0 -ftree-vrp" is the same (apart from the option listing), so "-ftree-vrp" simply has no effect.
