Resolving Multiple Vtables

Resolving Multiple Vtables

[Eric Lemings]

Greetings,

I'm trying to build the Apache C++ Standard Library (http:// 
incubator.apache.org/stdcxx) on Mac OS X Tiger.  I've resolved a  
number of easier porting issues but this one has me stumped.

Here's the output from a typical build:

host:~/Work/stdcxx user$ make BUILDDIR=~/Build/stdcxx  
BUILDMODE=shared,debug,pthreads
make[2]: Nothing to be done for `all'.
gcc      assert.o atomic-cxx.o bitset.o catalog.o codecvt.o collate.o  
ctype.o ctype_bits.o exception.o export.o facet.o file.o instance.o  
ios.o ios_bits.o iostore.o iostream.o iso2022.o limits.o  
limits_bits.o locale_bits.o locale_body.o locale_classic.o  
locale_combine.o locale_core.o locale_eq.o locale_global.o  
locale_name.o memattr.o memory.o messages.o num_get.o num_put.o  
punct.o random.o setlocale.o string.o strstream.o strtol.o  
ti_collate.o ti_filebuf.o ti_insert_dbl.o ti_insert_int.o  
ti_insert_ptr.o ti_ios.o ti_istream.o ti_messages.o ti_money_get.o  
ti_money_put.o ti_moneypunct.o ti_num_get.o ti_num_put.o  
ti_numpunct.o ti_ostream.o ti_streambuf.o ti_string.o ti_stringbuf.o  
ti_time_get.o ti_time_put.o ti_wcollate.o ti_wfilebuf.o  
ti_winsert_dbl.o ti_winsert_int.o ti_winsert_ptr.o ti_wios.o  
ti_wistream.o ti_wmessages.o ti_wmoney_get.o ti_wmoney_put.o  
ti_wmoneypunct.o ti_wnum_get.o ti_wnum_put.o ti_wnumpunct.o  
ti_wostream.o ti_wstreambuf.o ti_wstring.o ti_wstringbuf.o  
ti_wtime_get.o ti_wtime_put.o time_get.o time_put.o tmpbuf.o  
typeinfo.o valarray.o vecbool.o version.o wcodecvt.o wctype.o -lsupc+ 
+ -lgcc_eh -o /Users/user/Build/stdcxx/lib/libstd.so.4.2.0
/usr/bin/ld: multiple definitions of symbol vtable for  
std::bad_exception
exception.o definition of vtable for std::bad_exceptionin section  
(__DATA,__const)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libsupc++.a 
(eh_exception.o) private external definition of vtable for  
std::bad_exceptionin section (__DATA,__const)
/usr/bin/ld: multiple definitions of symbol vtable for std::bad_alloc
memory.o definition of vtable for std::bad_allocin section  
(__DATA,__const)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libsupc++.a 
(new_handler.o) private external definition of vtable for  
std::bad_allocin section (__DATA,__const)
collect2: ld returned 1 exit status
make[2]: *** [/Users/user/Build/stdcxx/lib/libstd.so] Error 1
make[1]: *** [lib] Error 2
make: *** [libstd] Error 2

Because exception.o and memory.o contain definitions of missing  
virtual functions in the std::bad_alloc and std::bad_exception  
classes, a vtable is created in the object files.  The problem is,  
these vtables are also contained in the libsupc++ library.  The GNU  
linker knows how to handle this (http://developer.apple.com/ 
documentation/DeveloperTools/gcc-4.0.1/gcc/Vague-Linkage.html#Vague- 
Linkage) but the Mac OS X linker does not, at least with the options  
given.

Are there link options specific to Mac OS X to resolve this problem?

Thanks,
Eric.