Re: [Boost-users] gcc optimization and boost::any

Subject: Re: [Boost-users] gcc optimization and boost::any
From: John (john_at_[hidden])
Date: 2009-03-16 10:44:20

Just to follow up:  It appears to be a bug in gcc's -fgcse optimization (which 
is enabled by -O2). Toggling -fno-gcse on gcc 4.2.2 eliminates the symptoms. The 
code in question is simple enough, and there were enough bugs reported against 
-fgcse, that we are content to let the blame fall on -fgcse, and move on. Thanks 
for the suggestions.

Rune Lund Olesen wrote:
> For a possible fix (however quick and dirty as it may be), you could try 
> to switch to using boost::variant instead (if at all possible).
> 
> If it makes sense to use boost::variant in you context you might as well 
> be satisfied with that.
> 
> Another thing that could be checked is that the code involved with the 
> any is compiled with the same compiler version and boost version (a 
> minimal test will of course help to identify such a problem)
> 
> --
> Rune
> 
> On Sun, Mar 15, 2009 at 6:42 PM, Sohail Somani <sohail_at_[hidden] 
> <mailto:sohail_at_[hidden]>> wrote:
> 
>     John wrote:
>      > If you know of such a bug or quirk in either GCC or boost::any,
>     or of a
>      > write-up of this somewhere... or even some idle speculation... it
>     could
>      > save us a lot of time tracking this down.
> 
>     Don't know anything off-hand but valgrind may be able to pinpoint where
>     something is going wrong.
> 
>     --
>     Sohail Somani
>     http://uint32t.blogspot.com
> 
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