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Subject:	Re: multiple definition of `atan2l' on the current Cygwin
To:	cygwin AT cygwin DOT com
References:	<888012 DOT 8502 DOT qm AT web101106 DOT mail DOT kks DOT yahoo DOT co DOT jp> <20160412133924 DOT GO9870 AT calimero DOT vinschen DOT de> <58477 DOT 93886 DOT qm AT web101112 DOT mail DOT kks DOT yahoo DOT co DOT jp> <neltp4$c89$1 AT ger DOT gmane DOT org>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<570E813C.6060307@gmail.com>
Date:	Wed, 13 Apr 2016 19:26:20 +0200
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On 13/04/2016 18:55, René Berber wrote:
> On 4/12/2016 7:08 PM, Tatsuro MATSUOKA wrote:
>
> [snip]
>> /usr/lib/gcc/x86_64-pc-cygwin/5.3.0/libstdc++.dll.a(d005836.o):(.text+0x0):
>> multiple definition of `atan2l'
>> ******************************************
>> /usr/lib/../lib/libm.a(t-d000195.o):fake:(.text+0x0): first defined
>> here
>
> Those lines point to the double definition very clearly.
>
> In Linux, libstdc++ doesn't include atan2l, only libm has it.  The
> question then is: why is libstdc++ different?
>

likely because it was built before that libm had it.
Only latest cygwin 2.5.0 has it.

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