Problem installing libtorrent (ld multiple defs error)

[Henry Todd]

Hi all, compiling libtorrent fails on my G5 iMac (yet it works fine on
my MBP), with a series of ld errors about "multiple definitions of
symbol", which I don't understand. I've included the full output at
the end of this mail, normally I can figure out what a build problem
is likely to be, but I've not come across this before.

I have the following versions of the dependencies:

  zlib @1.2.3_1
  pkgconfig @0.22_0
  openssl @0.9.8f_0+darwin_8
  libsigcxx2 @2.0.18_0+darwin_8

None are outdated, and I selfupdated/synced before I started. I read
in the list archives something about older versions of libtorrent
required gcc3.3, so given that it works fine on my MBP I thought I'd
check. My iMac is set to use gcc3.3 as I expected, so I set it to
gcc4.0 and tried again, but that also failed.

Can anyone shed any light on this?

Cheers,

Henry.



== Full (gcc3.3) output =============================================
henry$ sudo port install libtorrent
--->  Fetching libtorrent
--->  Verifying checksum(s) for libtorrent
--->  Extracting libtorrent
--->  Configuring libtorrent
--->  Building libtorrent with target all
Error: Target org.macports.build returned: shell command " cd
"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_net_libtorrent/work/libtorrent-0.11.7"
&& make all " returned error 2
Command output: /usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o)
private external definition of
__ZNSbIwSt11char_traitsIwESaIwEEaSERKS2_ in section (__TEXT,__text)
ld: multiple definitions of symbol __ZNSbIwSt11char_traitsIwESaIwEEaSEw
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZNSbIwSt11char_traitsIwESaIwEEaSEw
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZNSbIwSt11char_traitsIwESaIwEEaSEw in section
(__TEXT,__text)
ld: multiple definitions of symbol __ZNSbIwSt11char_traitsIwESaIwEEixEm
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZNSbIwSt11char_traitsIwESaIwEEixEm
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZNSbIwSt11char_traitsIwESaIwEEixEm in section
(__TEXT,__text)
ld: multiple definitions of symbol __ZNSbIwSt11char_traitsIwESaIwEEpLEPKw
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZNSbIwSt11char_traitsIwESaIwEEpLEPKw
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZNSbIwSt11char_traitsIwESaIwEEpLEPKw in section
(__TEXT,__text)
ld: multiple definitions of symbol __ZNSbIwSt11char_traitsIwESaIwEEpLERKS2_
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZNSbIwSt11char_traitsIwESaIwEEpLERKS2_
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZNSbIwSt11char_traitsIwESaIwEEpLERKS2_ in section
(__TEXT,__text)
ld: multiple definitions of symbol __ZNSbIwSt11char_traitsIwESaIwEEpLEw
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZNSbIwSt11char_traitsIwESaIwEEpLEw
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZNSbIwSt11char_traitsIwESaIwEEpLEw in section
(__TEXT,__text)
ld: multiple definitions of symbol
__ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_EPKS3_RKS6_
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_EPKS3_RKS6_
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_EPKS3_RKS6_
in section (__TEXT,__text)
ld: multiple definitions of symbol
__ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_ERKS6_S8_
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_ERKS6_S8_
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_ERKS6_S8_ in
section (__TEXT,__text)
ld: multiple definitions of symbol
__ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_ES3_RKS6_
/usr/lib/libstdc++.6.dylib(single module) definition of
__ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_ES3_RKS6_
/usr/lib/gcc/darwin/3.3/libstdc++.a(wstring-inst.o) private external
definition of __ZStplIwSt11char_traitsIwESaIwEESbIT_T0_T1_ES3_RKS6_ in
section (__TEXT,__text)
/usr/bin/libtool: internal link edit command failed
make[3]: *** [libtorrent.la] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Error: Status 1 encountered during processing.
== End output =======================================================