Undefined symbols for architecture x86_64

[macports@…]

Compiling coreutils on Mac OS X (Lion) fails with the infamous "Undefined symbols for architecture x86_64" error, see #32123, #33407. Unfortunately forcing a different compiler (as suggested in the tickets and in the ​documentation did not help here.

$ port clean coreutils
$ port install apple-gcc42
$ port install coreutils configure.compiler=apple-gcc-4.2 configure.cxx=g++-apple-4.2

From the main.log:

[...]
:info:build   CC     su.o
:info:build   AR     libver.a
:info:build   CCLD   chroot
:info:build ld: warning: ignoring file libver.a, file was built for archive which is not the architecture being linked (x86_64)
:info:build ld: warning: ignoring file ../lib/libcoreutils.a, file was built for archive which is not the architecture being linked (x86_64)
:info:build Undefined symbols for architecture x86_64:
:info:build   "_xstrdup", referenced from:
:info:build       _set_additional_groups in chroot.o

Setting configure.compiler to "llvm-gcc-4.2" or "gcc-4.2" did not help, although one could see in the buildlog that the setting was honored and llvm-gcc-4.2 resp. gcc-4.2 (resp. apple-gcc42) was used.

$ sw_vers 
ProductName:    Mac OS X
ProductVersion: 10.7.3
BuildVersion:   11D50

$ port version
Version: 2.0.4

$ xcodebuild -version
Xcode 4.1
Build version 4B110

[macports@…]

port install coreutils configure.compiler=apple-gcc-4.2 configure.cxx=g++-apple-4.2

[macports@…]

port install coreutils configure.compiler=clang

[macports@…]

port install coreutils