[Boost-build] selecting library based on <address-model> ?

Subject: [Boost-build] selecting library based on <address-model> ?
From: John Maddock (boost.regex_at_[hidden])
Date: 2010-11-22 04:38:35

I'm having trouble getting Boost.Regex to select the correct ICU library 
options: I need to select different options based on whether 
<address-model>64 is set, so I have:

      lib icuuc : :                                 <search>$(ICU_PATH)/lib 
<link>shared <runtime-link>shared ;
      lib icuuc : : <address-model>64 <search>$(ICU_PATH)/lib64 <link>shared 
<runtime-link>shared ;
      lib icuuc : :                                 <toolset>msvc 
<variant>debug <name>icuucd <search>$(ICU_PATH)/lib   <link>shared 
<runtime-link>shared ;
      lib icuuc : : <address-model>64 <toolset>msvc <variant>debug 
<name>icuucd <search>$(ICU_PATH)/lib64 <link>shared <runtime-link>shared ;
      lib icuuc : : <name>this_is_an_invalid_library_name ;

But that leads to:

error: No best alternative for ./icuuc
    next alternative: required properties: <link>shared <runtime-link>shared
        matched
    next alternative: required properties: <address-model>64 <link>shared 
<runtime-link>shared
        matched
    next alternative: required properties: <link>shared <runtime-link>shared 
<toolset>msvc <variant>debug
        matched

Note that the variant that *should* match - the forth one above doesn't get 
listed.

The strange thing is I'm sure I had this working at one point, then I tidied 
up the Jamfile formatting, and now it's broken :(

Any idea?

Many thanks, John.