multiple definition of `atan2l' on the current Cygwin

Wed Apr 13 00:09:00 GMT 2016

> From: Corinna Vinschen > To:
> Cc: 
> Date: 2016/4/12, Tue 22:39
> Subject: Re: multiple definition of `atan2l' on the current Cygwin
> 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'".
> I can't reproduce this with a simple testcase:
>   $ cat > <<EOF
>   #include <math.h>
>   int main ()
>   {
>     atan2l (1.0, 2.0);
>   }
>   EOF
>   $ g++ -g -o m -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?
Your testcase also works here.
I tried to make the test but I could not make a simple, self-contained testcase.
Instead I copy and paste full compile command and output at the link.
c++  -g -O2 -I/usr/lib/wx/include/gtk2-unicode-3.0 -I/usr/include/wx-3.0 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -DWXUSINGDLL -D__WXGTK__  -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16 -D_REENTRANT -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16  -L/usr/local/lib -lcerf  -o gnuplot.exe alloc.o axis.o breaders.o
 boundary.o color.o command.o contour.o datablock.o datafile.o dynarray.o eval.o external.o fit.o gadgets.o getcolor.o graph3d.o graphics.o help.o hidden3d.o history.o internal.o interpol.o jitter.o libcerf.o matrix.o misc.o mouse.o multiplot.o parse.o plot.o plot2d.o plot3d.o pm3d.o readline.o save.o scanner.o set.o show.o specfun.o standard.o stats.o stdfn.o tables.o tabulate.o term.o time.o unset.o util.o util3d.o variable.o version.o wxterminal/wxt_gui.o wxterminal/gp_cairo.o wxterminal/gp_cairo_helpers.o   -lz -lgd -lgd -ljpeg -lz -lpng16 -lm -lz -lfreetype -lbz2 -lz -lpng16 -lm -lz -lfontconfig -lexpat -lfreetype -lbz2 -lz -lpng16 -lm -lz -lexpat -lfreetype -lbz2 -lz -lpng16 -lm -lz -lfontconfig -lXpm -lX11 -lxcb -lXau -lXdmcp -lvpx -lm -lpthread -ltiff -llzma -ljbig -ljpeg -lz -liconv -llua -lcaca  -lwx_gtk2u_xrc-3.0 -lwx_gtk2u_webview-3.0 -lwx_gtk2u_html-3.0 -lwx_gtk2u_qa-3.0 -lwx_gtk2u_adv-3.0 -lwx_gtk2u_core-3.0 -lwx_baseu_xml-3.0
 -lwx_baseu_net-3.0 -lwx_baseu-3.0  -lpangocairo-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lintl -lcairo -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -lgio-2.0 -lXrender -lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage -lXfixes -lX11 -lXext -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lintl -lfontconfig -lfreetype  -lcaca -lcerf  -lz -lpangocairo-1.0 -lpango-1.0 -lgobject-2.0 -lcairo -lglib-2.0 -lintl
/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

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