Building 64-bit C++ shared libraries

[Albert Chin]

[resending as this garnered no response]

libtool 1.5 has the following to pass the -m64 GCC flag through to the
command building a C++ library:
      # gcc -m* arguments should be passed to the linker via $compiler_flags
      # in order to pass architecture information to the linker
      # (e.g. 32 vs 64-bit).  This may also be accomplished via -Wl,-mfoo
      # but this is not reliable with gcc because gcc may use -mfoo to
      # select a different linker, different libraries, etc, while
      # -Wl,-mfoo simply passes -mfoo to the linker.
      -m*)

This doesn't do anything for building 64-bit C++ libraries with the
vendor C++ compiler. Do we need to do something similar? Or is it
easier for us to say that if $LD == $CC for a tag, any unrecognized
options are passed to $compiler_flags?

-- 
albert chin (address@hidden)