[Lilypond-auto] Issue 2513 in lilypond: Patch: Build: add -fno-tree-vrp to CXXFLAGS for gcc 4.7.0

[lilypond]

Status: New
Owner: ----
Labels: Type-Enhancement Patch-new

New issue 2513 by address@hidden: Patch: Build: add -fno-tree-vrp to  
CXXFLAGS for gcc 4.7.0
http://code.google.com/p/lilypond/issues/detail?id=2513

Build: add -fno-tree-vrp to CXXFLAGS for gcc 4.7.0

That optimization breaks min() call in simultaneous-music-iterator.cc
leading to incorrect output and bogus barcheck errors.

Generalize STEPMAKE_GXXCODEGENBUG to show bug description with the flag.

GCC bug reported:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53239

http://codereview.appspot.com/6191048