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# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt
# or copy at http://www.boost.org/LICENSE_1_0.txt)

# This is a generic 'clang' toolset. Depending on the current system, it
# forwards either to 'clang-linux' or 'clang-darwin' modules.

import feature ;
import os ;
import toolset ;
import sequence ;
import regex ;
import set ;

feature.extend toolset : clang ;
feature.subfeature toolset clang : platform : : propagated link-incompatible ;

rule init ( * : * )
{
    if $(1) = win
    {
        toolset.using clang-win :
          $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
    }
    else if [ os.name ] = MACOSX
    {
        toolset.using clang-darwin : 
          $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
    }
    else
    {
        toolset.using clang-linux : 
          $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
    }
}


local rule cxxstd-flags ( toolset : condition * : options * )
{
    toolset.flags $(toolset).compile.c++ OPTIONS $(condition) : $(options) : unchecked ;
    toolset.flags $(toolset).link OPTIONS $(condition) : $(options) : unchecked ;
}

local rule version-ge ( lhs : rhs )
{
    lhs = [ regex.split $(lhs) "[.]" ] ;
    rhs = [ regex.split $(rhs) "[.]" ] ;
    return [ sequence.compare $(rhs) : $(lhs) : numbers.less ] ;
}

# Version specific flags
rule init-cxxstd-flags ( toolset : condition * : version )
{
    local cxxstd = [ feature.values <cxxstd> ] ;
    local dialects = [ feature.values <cxxstd-dialect> ] ;
    dialects = [ set.difference $(dialects) : gnu iso ] ;
    local std ;
    if [ version-ge $(version) : 3.5 ] { std = 1z ; }
    else if [ version-ge $(version) : 3.4 ] { std = 14 ; }
    else if [ version-ge $(version) : 3.3 ] { std = 11 ; }
    else { std = 03 ; }
    cxxstd-flags $(toolset) : $(condition)/<cxxstd>latest/<cxxstd-dialect>iso : -std=c++$(std) ;
    cxxstd-flags $(toolset) : $(condition)/<cxxstd>latest/<cxxstd-dialect>gnu : -std=gnu++$(std) ;
    cxxstd-flags $(toolset) : $(condition)/<cxxstd>latest/<cxxstd-dialect>$(dialects) : -std=c++$(std) ;
}