#!/usr/bin/env python

# encoding: utf-8

# Thomas Nagy 2009-2018 (ita)

# DragoonX6 2018

"""

Detect the Clang++ C++ compiler

This version is an attempt at supporting the -target and -sysroot flag of Clang++.

"""

from waflib.Tools import ccroot, ar, gxx

from waflib.Configure import conf

import waflib.extras.clang_cross_common

def options(opt):

	"""

	Target triplet for clang++::

			$ waf configure --clangxx-target-triple=x86_64-pc-linux-gnu

	"""

	cxx_compiler_opts = opt.add_option_group('Configuration options')

	cxx_compiler_opts.add_option('--clangxx-target-triple', default=None,

		help='Target triple for clang++',

		dest='clangxx_target_triple')

	cxx_compiler_opts.add_option('--clangxx-sysroot', default=None,

		help='Sysroot for clang++',

		dest='clangxx_sysroot')

@conf

def find_clangxx(conf):

	"""

	Finds the program clang++, and executes it to ensure it really is clang++

	"""

	import os

	cxx = conf.find_program('clang++', var='CXX')

	if conf.options.clangxx_target_triple != None:

		conf.env.append_value('CXX', ['-target', conf.options.clangxx_target_triple])

	if conf.options.clangxx_sysroot != None:

		sysroot = str()

		if os.path.isabs(conf.options.clangxx_sysroot):

			sysroot = conf.options.clangxx_sysroot

		else:

			sysroot = os.path.normpath(os.path.join(os.getcwd(), conf.options.clangxx_sysroot))

		conf.env.append_value('CXX', ['--sysroot', sysroot])

	conf.get_cc_version(cxx, clang=True)

	conf.env.CXX_NAME = 'clang'

@conf

def clangxx_modifier_x86_64_w64_mingw32(conf):

	conf.gcc_modifier_win32()

@conf

def clangxx_modifier_i386_w64_mingw32(conf):

	conf.gcc_modifier_win32()

@conf

def clangxx_modifier_msvc(conf):

	v = conf.env

	v.cxxprogram_PATTERN = v.cprogram_PATTERN

	v.cxxshlib_PATTERN   = v.cshlib_PATTERN

	v.CXXFLAGS_cxxshlib  = []

	v.LINKFLAGS_cxxshlib = v.LINKFLAGS_cshlib

	v.cxxstlib_PATTERN   = v.cstlib_PATTERN

	v.LINK_CXX           = v.CXX + ['-fuse-ld=lld', '-nostdlib']

	v.CXXLNK_TGT_F       = v.CCLNK_TGT_F

@conf

def clangxx_modifier_x86_64_windows_msvc(conf):

	conf.clang_modifier_msvc()

	conf.clangxx_modifier_msvc()

	# Allow the user to override any flags if they so desire.

	clang_modifier_user_func = getattr(conf, 'clangxx_modifier_x86_64_windows_msvc_user', None)

	if clang_modifier_user_func:

		clang_modifier_user_func()

@conf

def clangxx_modifier_i386_windows_msvc(conf):

	conf.clang_modifier_msvc()

	conf.clangxx_modifier_msvc()

	# Allow the user to override any flags if they so desire.

	clang_modifier_user_func = getattr(conf, 'clangxx_modifier_i386_windows_msvc_user', None)

	if clang_modifier_user_func:

		clang_modifier_user_func()

def configure(conf):

	conf.find_clangxx()

	conf.find_program(['llvm-ar', 'ar'], var='AR')

	conf.find_ar()

	conf.gxx_common_flags()

	# Allow the user to provide flags for the target platform.

	conf.gxx_modifier_platform()

	# And allow more fine grained control based on the compiler's triplet.

	conf.clang_modifier_target_triple(cpp=True)

	conf.cxx_load_tools()

	conf.cxx_add_flags()

	conf.link_add_flags()