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Date: Thu, 12 Mar 2009 15:41:24 +0000
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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Subject: Re: [ANNOUNCEMENT] Updated: experimental package: gcc4-4.3.2-2
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Angelo Graziosi wrote:
> To test this new version of the compiler I have rebuild ROOT [1]. It
> builds fine, but when I try to build its tests, at least one fails in
> linking:

> d000037.o:(.idata$5+0x0): multiple definition of `__imp___ZTISt9exception'
> /usr/lib/gcc/i686-pc-cygwin/4.3.2/libstdc++.dll.a(d002074.o):(.idata$5+0x0):
> first defined here
> d000037.o:(.idata$6+0x0): multiple definition of `__nm___ZTISt9exception'
> /usr/lib/gcc/i686-pc-cygwin/4.3.2/libstdc++.dll.a(d002074.o):(.idata$6+0x0):
> first defined here
> d000073.o:(.idata$5+0x0): multiple definition of `__imp___ZTISt9exception'
> /usr/lib/gcc/i686-pc-cygwin/4.3.2/libstdc++.dll.a(d002074.o):(.idata$5+0x0):
> first defined here
> d000073.o:(.idata$6+0x0): multiple definition of `__nm___ZTISt9exception'
> /usr/lib/gcc/i686-pc-cygwin/4.3.2/libstdc++.dll.a(d002074.o):(.idata$6+0x0):
> first defined here

  Ok, for some reason it appears that libCore.dll.a exports symbols from libstdc++:

DKAdmin AT ubik /work/root/test
$ nm /work/root/lib/libCore.dll.a  |grep St9exception
71d6b958 d .rdata$_ZTISt9exception
71d6ff40 d .rdata$_ZTSSt9exception
71d6b958 D __ZTISt9exception
71d6ff40 D __ZTSSt9exception


  Looks like the DLL got linked against static libstdc++, while the app links
against shared libstdc++?  That certainly wouldn't be expected to work.  I'll take
a little look at how ROOT builds its DLLs, hopefully we just need to tweak an
LDFLAGS or similar somewhere.

    cheers,
      DaveK

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