Re: [Boost-build] Q: custom-linking-generator generated-targets: How to call DEPENDS?

From: Mark Evans (evans_mark_at_[hidden])
Date: 2006-02-14 23:30:05

Experts - I figured out "a way" to do what I want.  I couldn't  figure out in how to get a handle on the target corresponding to the  sources passed to generated-targets.  So I gave up on doing  DEPENDS inside of generated-targets and just pass the sources list  unchanged to unix-linking-generator.generated-targets.  Later in  the link actions rule, I discriminate the include-whole archive sources  based on the presence of <include-library-whole> or whatever I  called it entries in the properties list.  

  Thus I end up with a command line like:
  
  link -include_whole path/libfoo.a  ...
  
  instead of
  
  link -include_whole path/libfoo.a  path/libfoo.a ...
  
  FWIW - the generated-targets code now looks as follows:
  
  class hptns-linking-generator : unix-linking-generator
  {
      # Provides special handling for <hptns-include-whole> archives
      rule generated-targets ( sources + : property-set : project name ? )
      {
          local properties2 = [ $(property-set).raw ] ;
          for local s in $(sources)
          {
              if [ type.is-derived [ $(s).type ] STATIC_LIB ]
              {
                  local a = [ $(s).action ] ;
                  local ps ;
                  local psraw ;
                  if $(a)
                  {
                       ps = [ $(a).properties ] ;
                      if $(ps)
                      {
                           psraw = [ $(ps).raw ] ;
                      }
                  }
                   if <hptns-include-whole>yes in $(psraw)
                  {
                       local actual-name = [ $(s).actual-name ] ; # Gristed name
                       properties2 += <hptns-include-whole-arch>$(actual-name) ;
                  }
              }
          }
          local spawn = [ unix-linking-generator.generated-targets $(sources) 
                           : [ property-set.create $(properties2) ] : $(project) $(name) ] ;
          return $(spawn) ;
      }
  }
  
  # Helper rule for rule link is where I remove include-whole archives
  # from normal library list.
  
  rule handle-libraries ( targets * : sources * : properties * )
  {
    local sources2 ;
    local whole-archs ;
    for local p in $(properties)
    {
      if $(p:G) = <hptns-include-whole-arch>
      {
        whole-archs += $(p:G=) ;
      }
    }
    for local s in $(sources)
    {
      local suffix = $(s:S) ;
      
      # Discriminate LIB types from OBJ types via well-known suffixes (Ugh)
      if $(suffix) = .so || $(suffix) = .srl || $(suffix) = .a  
      {
        if ! $(s) in $(whole-archs)
        {
          LIBS on $(targets) += $(s) ;
        }
        # else omit $(s) from LIBS list - the archive will get
        # included via flags binding for <hptns-include-whole-arch>
      }
      else
      {    
        sources2 += $(s) ;
      }
    }
    OBJS on $(targets) += $(sources2) ;
  }
  
  FWIW (2c) - Mark