[csw-users] GCC4 ld Warnings

[Kapoor, Nitin]

Do you know where it would come from ("/opt/csw/gcc4/lib/libstdc++.so") ? The only place where I have to pass the /opt/csw/gcc4/lib is when I configure a package. ( ./configure LDFLAGS=-R/opt/csw/gcc4/lib)

-bash-3.00$ env
TERM=xterm
SHELL=/usr/bin/bash
SSH_CLIENT=172.21.9.118 1585 22
SSH_TTY=/dev/pts/1
USER=sbsmlat
MAIL=/var/mail//sbsmlat
PATH=/usr/ccs/bin:/usr/local/bin:/usr/bin
PWD=/export/home/sbsmlat/PKGS
TZ=US/Eastern
SHLVL=1
HOME=/export/home/sbsmlat
LOGNAME=sbsmlat
SSH_CONNECTION=172.21.9.118 1585 192.168.40.25 22
_=/usr/bin/env
OLDPWD=/export/home/sbsmlat


Thanks,

Nitin.

-----Original Message-----
From: users-bounces+nkapoor=sensis.com at lists.opencsw.org [mailto:users-bounces+nkapoor=sensis.com at lists.opencsw.org] On Behalf Of Maciej Blizinski
Sent: Monday, April 11, 2011 6:35 PM
To: Questions and discussions
Subject: Re: [csw-users] GCC4 ld Warnings

2011/4/11 Kapoor, Nitin <Nitin.Kapoor at sensis.com>:
> (...) -licuuc -licudata -lnsl -lsocket -lpthread -ldl /opt/csw/gcc4/lib/libstdc++.so

I believe that the culprit is the explicit
"/opt/csw/gcc4/lib/libstdc++.so" parameter given to the linker, you
can see it up there in the output.  Here's a minimal example to
reproduce this behavior:

maciej at netra ~/src/gcc-test $ cat Makefile
PATH := /opt/csw/bin:/opt/csw/gcc4/bin:$(PATH)
LDFLAGS = -R/opt/csw/gcc4/lib -L/opt/csw/gcc4/lib $(EXTRA_LDFLAGS)
CC = gcc
CXX = g++

all: foo

foo: foo.cpp

foo.cpp: Makefile
        echo '#include <stdio.h>' > foo.cpp
        echo 'main(void) { printf("Hello world!\\n"); }' >> foo.cpp

clean:
        rm -f foo foo.o foo.cpp
maciej at netra ~/src/gcc-test $ gmake
echo '#include <stdio.h>' > foo.cpp
echo 'main(void) { printf("Hello world!\\n"); }' >> foo.cpp
g++   -R/opt/csw/gcc4/lib -L/opt/csw/gcc4/lib   foo.cpp   -o foo
maciej at netra ~/src/gcc-test $ gmake clean
rm -f foo foo.o foo.cpp
maciej at netra ~/src/gcc-test $ gmake EXTRA_LDFLAGS=/opt/csw/gcc4/lib/libstdc++.so
echo '#include <stdio.h>' > foo.cpp
echo 'main(void) { printf("Hello world!\\n"); }' >> foo.cpp
g++   -R/opt/csw/gcc4/lib -L/opt/csw/gcc4/lib
/opt/csw/gcc4/lib/libstdc++.so  foo.cpp   -o foo
ld: warning: file /opt/csw/gcc4/lib/libstdc++.so: attempted multiple
inclusion of file
maciej at netra ~/src/gcc-test $

To fix the warning in your case, you need to analyze the build system
of the software you're building, and find out why the explicit
reference to libstdc++.so appears in the linker invocation.  If you
manage to remove it, the warning should disappear.

Maciej
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