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Date: Thu, 08 Sep 2011 07:42:08 -0400
From: Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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Subject: Re: [ANNOUNCEMENT] Updated: stable compiler package gcc4-4.5.3-2
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On 08/09/2011 1:32 AM, Frédéric Bron wrote:
> I have recompiled the code I am working on with i686-pc-cygwin-g++ 4.5.3.
>
> I get many of the following messages from the linker:
> /usr/lib/gcc/i686-pc-cygwin/4.5.3/../../../../i686-pc-cygwin/bin/ld:
> gcc-release/obj/BTest/Test.o: warning: duplicate section
> `.rdata$_ZTISs[typeinfo for std::basic_string<char,
> std::char_traits<char>, std::allocator<char>  >]' has different size
>
> I do not get this error cross-compiling the same code with
> i686-pc-mingw32-g++ 4.5.2.
>
> Any chance that this comes from the new version?
In my experience, these sorts of errors arise when there really is 
something wrong with the code, usually involving sizes of integers (e.g. 
'long' in struct's definition and 'int' in another, on a 64-bit 
machine). However, the linker is poorly-equipped to detect such errors 
unless the resulting objects have different sizes.

So, while I wouldn't rule out miscompilation, I would first check for 
silently conflicting definitions in different compilation units.

At least one list discussion for another project reported a similar 
gcc-whines-mingw-silent issue, and the resulting mingw binary didn't run 
properly (which supports the silent conflict hypothesis).

BTW, a STC would have been extremely helpful here -- all we can do is 
speculate without it

Ryan


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