# Copyright Vladimir Prus 2004.
# Copyright Noel Belcourt 2007.
# Copyright Nikita Kniazev 2020.
# 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)

import clang ;
import feature : feature ;
import os ;
import toolset ;
import toolset : flags ;
import gcc ;
import common ;
import errors ;
import generators ;

feature.extend-subfeature toolset clang : platform : darwin ;

toolset.inherit-generators clang-darwin
  <toolset>clang <toolset-clang:platform>darwin
  : gcc
  : gcc.mingw.link gcc.mingw.link.dll
  ;

generators.override clang-darwin.prebuilt : builtin.lib-generator ;
generators.override clang-darwin.prebuilt : builtin.prebuilt ;
generators.override clang-darwin.searched-lib-generator : searched-lib-generator ;

# Override default do-nothing generators.
generators.override clang-darwin.compile.c.pch   : pch.default-c-pch-generator   ;
generators.override clang-darwin.compile.c++.pch : pch.default-cpp-pch-generator ;

generators.register-c-compiler clang-darwin.compile.m : OBJECTIVE_C : OBJ : <toolset>clang <toolset-clang:platform>darwin ;
generators.register-c-compiler clang-darwin.compile.mm : OBJECTIVE_CPP : OBJ : <toolset>clang <toolset-clang:platform>darwin ;

toolset.inherit-rules clang-darwin : gcc ;
toolset.inherit-flags clang-darwin : gcc
        : <inlining>full
          <architecture>x86/<address-model>32
          <architecture>x86/<address-model>64
          <lto>on/<lto-mode>full
          <lto>on/<lto-mode>fat
        ;

if [ MATCH (--debug-configuration) : [ modules.peek : ARGV ] ]
{
    .debug-configuration = true ;
}

# Initializes the clang-darwin toolset
#   version in optional
#   name (default clang++) is used to invoke the specified clang compiler
#   compile and link options allow you to specify addition command line options for each version
rule init ( version ? :  command * : options * )
{
    command = [ common.get-invocation-command clang-darwin : clang++
        : $(command) : /usr/bin /usr/local/bin ] ;

    # Determine the version
    local command-string = $(command:J=" ") ;
    if $(command)
    {
        version ?= [ MATCH "version ([0-9]+[.][0-9]+)"
            : [ SHELL "$(command-string) --version" ] ] ;
    }

    local condition = [ common.check-init-parameters clang
        : version $(version) ] ;

    common.handle-options clang-darwin : $(condition) : $(command) : $(options) ;
    clang.init-cxxstd-flags clang-darwin : $(condition) : $(version) ;

    # - Ranlib.
    local ranlib = [ feature.get-values <ranlib> : $(options) ] ;
    toolset.flags clang-darwin.archive .RANLIB $(condition) : $(ranlib[1]) ;

    # - Archive builder.
    local archiver = [ feature.get-values <archiver> : $(options) ] ;
    toolset.flags clang-darwin.archive .AR $(condition) : $(archiver[1]) ;
}

SPACE = " " ;

toolset.flags clang-darwin.compile.m OPTIONS <mflags> ;
toolset.flags clang-darwin.compile.mm OPTIONS <mflags> ;
toolset.flags clang-darwin.compile.mm OPTIONS <mmflags> ;

# Declare flags and action for compilation.

# For clang, 'on' and 'full' are identical
toolset.flags clang-darwin.compile OPTIONS <inlining>full : -Wno-inline ;

# SJW 12/2017: Support for <flags> is widely inconsistent.
# shouldn't this be handled by the common gcc?
toolset.flags clang-darwin.compile OPTIONS <flags> ;

# LTO
toolset.flags clang-darwin.compile OPTIONS <lto>on/<lto-mode>thin : -flto=thin ;
toolset.flags clang-darwin.link OPTIONS <lto>on/<lto-mode>thin : -flto=thin ;

toolset.flags clang-darwin.compile OPTIONS <lto>on/<lto-mode>full : -flto=full ;
toolset.flags clang-darwin.link OPTIONS <lto>on/<lto-mode>full : -flto=full ;

# stdlib selection
toolset.flags clang-darwin.compile OPTIONS <stdlib>gnu <stdlib>gnu11 : -stdlib=libstdc++ ;
toolset.flags clang-darwin.link OPTIONS <stdlib>gnu <stdlib>gnu11 : -stdlib=libstdc++ ;

toolset.flags clang-darwin.compile OPTIONS <stdlib>libc++ : -stdlib=libc++ ;
toolset.flags clang-darwin.link OPTIONS <stdlib>libc++ : -stdlib=libc++ ;

rule compile.c ( targets * : sources * : properties * )
{
    DEPENDS $(<) : [ on $(<) return $(PCH_FILE) ] ;
}

rule compile.c++ ( targets * : sources * : properties * )
{
    DEPENDS $(<) : [ on $(<) return $(PCH_FILE) ] ;
}

.include-pch = "-include-pch " ;

actions compile.c bind PCH_FILE
{
    "$(CONFIG_COMMAND)" -x c $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" $(.include-pch)"$(PCH_FILE)" -c -o "$(<)" "$(>)"
}

actions compile.c++ bind PCH_FILE
{
    "$(CONFIG_COMMAND)" -x c++ $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" $(.include-pch)"$(PCH_FILE)" -c -o "$(<)" "$(>)"
}

actions compile.c.pch
{
    "$(CONFIG_COMMAND)" -x c-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -o "$(<)" "$(>)"
}

actions compile.c++.pch
{
    "$(CONFIG_COMMAND)" -c -x c++-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -o "$(<)" "$(>)"
}

actions compile.m
{
    "$(CONFIG_COMMAND)" -x objective-c $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
}

actions compile.mm
{
    "$(CONFIG_COMMAND)" -x objective-c++ $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
}

# Default value. Mostly for the sake of clang-linux
# that inherits from gcc, but does not has the same
# logic to set the .AR variable. We can put the same
# logic in clang-linux, but that's hardly worth the trouble
# as on Linux, 'ar' is always available.
.AR = ar ;
.RANLIB = ranlib -cs ;

rule archive ( targets * : sources * : properties * )
{
  # Always remove archive and start again. Here's rationale from
  # Andre Hentz:
  #
  # I had a file, say a1.c, that was included into liba.a.
  # I moved a1.c to a2.c, updated my Jamfiles and rebuilt.
  # My program was crashing with absurd errors.
  # After some debugging I traced it back to the fact that a1.o was *still*
  # in liba.a
  #
  # Rene Rivera:
  #
  # Originally removing the archive was done by splicing an RM
  # onto the archive action. That makes archives fail to build on NT
  # when they have many files because it will no longer execute the
  # action directly and blow the line length limit. Instead we
  # remove the file in a different action, just before the building
  # of the archive.
  #
  local clean.a = $(targets[1])(clean) ;
  TEMPORARY $(clean.a) ;
  NOCARE $(clean.a) ;
  LOCATE on $(clean.a) = [ on $(targets[1]) return $(LOCATE) ] ;
  DEPENDS $(clean.a) : $(sources) ;
  DEPENDS $(targets) : $(clean.a) ;
  common.RmTemps $(clean.a) : $(targets) ;
}

actions piecemeal archive
{
  "$(.AR)" $(AROPTIONS) rc "$(<)" "$(>)"
  "$(.RANLIB)" "$(<)"
}

# Declare actions for linking
rule link ( targets * : sources * : properties * )
{
  SPACE on $(targets) = " " ;
}

actions link bind LIBRARIES
{
    "$(CONFIG_COMMAND)" $(USER_OPTIONS) -L"$(LINKPATH)" -o "$(<)" "$(>)" "$(LIBRARIES)" $(START-GROUP) $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS)
}

actions link.dll bind LIBRARIES
{
    "$(CONFIG_COMMAND)" $(USER_OPTIONS) -L"$(LINKPATH)" -o "$(<)" -single_module -dynamiclib -install_name "@rpath/$(<[1]:D=)" "$(>)"  "$(LIBRARIES)" $(START-GROUP) $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS)
}
