Static/import library suffix problem

For the Embarcadero toolset on Windows the static library and import 
library suffix for the bcc64 64-bit compiler is '.a' and not '.lib'. 
However if the library is a system library such as the Windows system 
library advapi, the suffix is naturally '.lib'. In embarcadero.jam I have:

type.set-generated-target-suffix STATIC_LIB : <toolset>embarcadero 
<target-os>windows <address-model>64 : a ;
type.set-generated-target-suffix IMPORT_LIB : <toolset>embarcadero 
<target-os>windows <address-model>64 : a ;

but this means, for example, that advapi.a, which of course does not 
exist, is added to the linker command rather than the correct advapi.lib 
when advapi is specified in some jam file. How can I fix this ?

Is advapi a SEARCHED_LIB, and should specifying:

type.set-generated-target-suffix SEARCHED_LIB : <toolset>embarcadero 
<target-os>windows <address-model>64 : lib ;

solve this problem, or must I do something else to distinguish 
static/import libraries which are system libraries from other libraries 
produced by the bcc64 compiler in Boost Build ?








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