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Date: Tue, 12 Apr 2016 15:39:24 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: multiple definition of `atan2l' on the current Cygwin
Message-ID: <20160412133924.GO9870@calimero.vinschen.de>
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On Apr 12 17:11, Tatsuro MATSUOKA wrote:
> Hello
> I have updated Cygwin_x86 and Cygwin_x86-64 today.
> In building the gnuplot I have met the error of "multiple definition of `=
atan2l'".
> /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
> collect2: error: ld returned 1 exit status
> Makefile:777: recipe for target 'gnuplot.exe' failed
> This did not occur yesterday.
> Perhaps the latest change gcc-5.3.0 give this results.
> At=C2=A0the moment=C2=A0a workaroud is :
> LDFLAGS=3D'-Wl,--allow-multiple-definition' \
> at configure.

I can't reproduce this with a simple testcase:

  $ cat > m.cc <<EOF
  #include <math.h>

  int main ()
  {
    atan2l (1.0, 2.0);
  }
  EOF
  $ g++ -g -o m m.cc -lm -lstdc++ -lm -lstdc++

This builds and links fine for me.

Is there a chance that gnuplot accidentally provides its own atan2l on
Cygwin, despite Cygwin 2.5.0 now providing it per C99?  Or did you, by
any chance, try to rebuild gnuplot without reconfiguring the build?

Can you please provide a simple, self-contained testcase?


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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