# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE.txt
# or copy at https://www.bfgroup.xyz/b2/LICENSE.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) : 12.0 ] { std = 2b ; }
    else if [ version-ge $(version) : 10.0 ] { std = 20 ; }
    else if [ version-ge $(version) : 6.0 ] { std = 2a ; }
    else if [ version-ge $(version) : 5.0 ] { std = 17 ; }
    else 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) ;
}

local rule init-flags-cross ( toolset : condition * : architecture + : address-model + : target-os )
{
    local vendor = unknown ;
    local sys = unknown ;
    switch $(target-os)
    {
        case darwin : vendor = apple ; sys = darwin ;
        case linux : vendor = pc ; sys = linux ;
    }
    local vendor-sys = $(vendor)-$(sys) ;
    for local _architecture_ in $(architecture)
    {
        for local _address-model_ in $(address-model)
        {
            local arch = unknown ;
            switch $(_architecture_)-$(_address-model_)
            {
                case arm-64 : arch = arm64 ;
                case arm-32 : arch = arm ;
                case x86-64 : arch = x86_64 ;
                case x86-32 : arch = i386 ;
            }

            toolset.flags $(toolset)
                OPTIONS $(condition)/<target-os>$(target-os)/<architecture>$(_architecture_)/<address-model>$(_address-model_)
                : "--target=$(arch)-$(vendor-sys)"
                : unchecked ;
        }
    }
}

rule init-flags ( toolset : condition * : version )
{
    init-cxxstd-flags $(toolset) : $(condition) : $(version) ;

    init-flags-cross $(toolset) : $(condition) : arm x86 : 64 : darwin ;
    init-flags-cross $(toolset) : $(condition) : arm x86 : 64 32 : linux ;

    # This is a temporary solution for doing combined architecture builds on macOS.
    toolset.flags $(toolset)
        OPTIONS $(condition)/<target-os>darwin/<architecture>arm+x86/<address-model>64
        : "-arch arm64" "-arch x86_64"
        : unchecked ;
}