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

[lilypond]

Updates:
        Status: Started

Comment #6 on 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

-O1 are "most effective and affordable optimizations", so if -O1 -ftree-vrp  
makes bad code already, I agree that -fno-tree-vrp seems like our best bet  
at the current point of time.

LGTM.  To avoid delays, I would strongly suggest putting this on the same  
or an earlier countdown than issue #2514 and pushing issue #2513 first.  It  
would also be a prime candidate for cherry-picking into 2.16 if it that  
gets released as currently planned, and pushing it earlier than issue #2514  
will make sure that one can cherry-pick it independently from that issue.   
It certainly is more important.

Thanks for the really thorough testing you made here.  I also see that you  
reported the problem to GCC developers and that they are on track.   
Unfortunately it turns out from the discussion that the tree-vrp pass is  
not responsible in itself (and as I stated in comment #3, it has been  
around for quite a long time) but is working from bad input.

So let us hope that the bug _only_ manifests itself in the work of  
tree-vrp, or we will potentially have more fun with the effects of this bug  
in other places.

Anybody from those with project administration rights on code.google.com: I  
can't make Pavel the owner of this issue.  Can you add him to the members  
of this project?