Jamshared

#
# Extend the Jambase to build shared libraries.
#

SUFDLL ?= .so ;

rule SharedLibrary
{
    SharedLibraryFromObjects $(<) : $(>:S=$(SUFOBJ)) ;
    Objects $(>) ;
}

rule SharedLibraryFromObjects
{
    local _i _l _s ;

    # Add grist to file names

    _s = [ FGristFiles $(>) ] ;
    _l = $(<:S=$(SUFDLL)) ;

    # library depends on its member objects

    Depends obj : $(_s) ;

    # Set LOCATE for the library and its contents.  The bound
    # value shows up as $(NEEDLIBS) on the Link actions.
    # For compatibility, we only do this if the library doesn't
    # already have a path.

    if ! $(_l:D)
    {
        MakeLocate $(_l) $(_l)($(_s:BS)) : $(LOCATE_TARGET) ;
    }

    # make the library depend directly on the on-disk object files.  

    Depends $(_l) : $(_s) ;

    Clean clean : $(_l) ;

    SharedLink $(_l) : $(_s) ;
}

rule SharedLinkLibraries
{
    # make library dependencies of target
    # set NEEDLIBS variable used by 'actions Main'

    local _t = [ FAppendSuffix $(<) : $(SUFEXE) ] ;

    Depends $(_t) : $(>:S=$(SUFDLL)) ;
    NEEDLIBS on $(_t) += $(>:S=$(SUFDLL)) ;
}

rule LinkLibrariesOnSharedLibrary
{
    # make library dependencies of target
    # set NEEDLIBS variable used by 'actions Main'

    local _t = [ FAppendSuffix $(<) : $(SUFDLL) ] ;

    Depends $(_t) : $(>:S=$(SUFLIB)) ;
    NEEDLIBS on $(_t) += $(>:S=$(SUFLIB)) ;
}

rule SharedLinkLibrariesOnSharedLibrary
{
    # make library dependencies of target
    # set NEEDLIBS variable used by 'actions Main'

    local _t = [ FAppendSuffix $(<) : $(SUFDLL) ] ;

    Depends $(_t) : $(>:S=$(SUFDLL)) ;
    NEEDLIBS on $(_t) += $(>:S=$(SUFDLL)) ;
}

if $(OS) = MACOSX
{
    actions together SharedLink bind NEEDLIBS
    {
        $(LINK) -headerpad_max_install_names $(FRAMEWORKS) $(MAINARCH) $(ALTARCH) -dynamiclib $(SHRLINKFLAGS) -install_name @executable_path/$(<:D=) -o $(<) $(>) $(NEEDLIBS) $(SHRLINKLIBS)
    }
}
else
{
    actions together SharedLink bind NEEDLIBS
    {
        $(LINK) -shared $(SHRLINKFLAGS) -Wl,-soname,$(<:D=) -o $(<) $(>) $(NEEDLIBS) $(SHRLINKLIBS)
    }
}