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From: "Judd" <jbogus1 AT yahoo DOT com>
Subject: Re: Build/Linker question again (g++)
Date: Mon, 25 Oct 2004 07:33:48 -0600
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Message-ID: <clivc5$e7i$1@sea.gmane.org>
References: <clb7sb$bar$1 AT sea DOT gmane DOT org> <417ADE6A DOT 7090804 AT familiehaase DOT de>
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"Gerrit P. Haase" <gp AT familiehaase DOT de> wrote in message
news:417ADE6A DOT 7090804 AT familiehaase DOT de...
> Judd wrote:
>
> > The error I'm getting now is:
> > ----------------------------
> > /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/libgcc.a(_chkstk.o)(.text+0x0):
> > multiple definition of `__alloca'
> >
> > /usr/lib/libcygwin.a(d000085.o)(.text+0x0): first defined here
> >
> > /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/libgcc.a(_eprintf.o)(.text+0x0):
> > multiple definition of `___eprintf'
> >
> > /usr/lib/libcygwin.a(d000027.o)(.text+0x0): first defined here
> >
> > ---------------------------------
> >
> > From the build command:
> >
> > -------------------------
> >
> > g++ -shared \
>  >  -nodefaultlibs \
>  >  -o libInventor.dll \
>  >  -Wl,--out-implib=libInventor.dll.a \
> >  -Wl,--export-all-symbols \
>  >  -Wl,--enable-auto-import \
>  >  -Wl,--whole-archive \
> >  libInventor.a \
>  >  -WL,--no-whole-archive \
>  >  -L/usr/lib \
>  >  -L/usr/lib/gcc-lib/i686-pc-cygwin/3.3.3 \
>  >  -L/usr/X11R6/lib \
>  >  -L/usr/lib/w32api \
>  >  -L../libimage \
>  >  -L../libFL/src \
> >  -ljpeg.dll -limage -lFL -lX11.dll -lfltk_gl.dll -lGLU.dll \
>  > -lGL.dll -liconv.dll -lfreetype.dll -lcygwin -lstdc++ \
>  > -lasprintf -lz -lkernel32 -lgcc
>
> You don't need to add the .dll prefix, the linker should automatically
> pick up the .dll.a import lib if both, import lib and static archives
> are present.
>

Not the problem, but thanks.

>
> > -----------------------------
> >
> > I'm using nodefaultlibs because I had a problem linking before where I
was
> > getting lots of multiple definition errors from essentially the same
> > library.  Using nodefaultlibs and linking all the libs I need by hand
has
> > fixed all those, but I have those last 2 multiple definition errors.  Is
> > there any way to link libcygwin and libgcc without getting multiple
> > definitions of ___eprintf and __alloca?  It seems bizarre that those 2
would
> > conflict.  Maybe there's a command line option that I need to be using
in my
> > build command.
>
> There is no option like nodefaultlibs:
>
> $ ld --help | grep nodefaultlibs
>
> Try -nostdlib instead.

Actually, the option does exist with 3.3.3 and it does work.  It forces the
linker not to use default libraries.  I could take the argument out and get
a completely different build.  I'm more interested in somone knowing about
the errors I suppose and how to get around a multiple definition error of
eprintf and alloca between libgcc and libcygwin.






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