#!/usr/bin/env python3
# encoding: utf-8
# Thomas Nagy, 2006-2018 (ita)
# Ralf Habacker, 2006 (rh)
# Yinon Ehrlich, 2009

"""
gcc/llvm detection.
"""

from waflib.Tools import ccroot, ar
from waflib.Configure import conf

@conf
def find_gcc(conf):
	"""
	Find the program gcc, and if present, try to detect its version number
	"""
	cc = conf.find_program(['gcc', 'cc'], var='CC')
	conf.get_cc_version(cc, gcc=True)
	conf.env.CC_NAME = 'gcc'

@conf
def gcc_common_flags(conf):
	"""
	Common flags for gcc on nearly all platforms
	"""
	v = conf.env

	v.CC_SRC_F            = []
	v.CC_TGT_F            = ['-c', '-o']

	if not v.LINK_CC:
		v.LINK_CC = v.CC

	v.CCLNK_SRC_F         = []
	v.CCLNK_TGT_F         = ['-o']
	v.CPPPATH_ST          = '-I%s'
	v.DEFINES_ST          = '-D%s'

	v.LIB_ST              = '-l%s' # template for adding libs
	v.LIBPATH_ST          = '-L%s' # template for adding libpaths
	v.STLIB_ST            = '-l%s'
	v.STLIBPATH_ST        = '-L%s'
	v.RPATH_ST            = '-Wl,-rpath,%s'

	v.SONAME_ST           = '-Wl,-h,%s'
	v.SHLIB_MARKER        = '-Wl,-Bdynamic'
	v.STLIB_MARKER        = '-Wl,-Bstatic'

	v.cprogram_PATTERN    = '%s'

	v.CFLAGS_cshlib       = ['-fPIC']
	v.LINKFLAGS_cshlib    = ['-shared']
	v.cshlib_PATTERN      = 'lib%s.so'

	v.LINKFLAGS_cstlib    = ['-Wl,-Bstatic']
	v.cstlib_PATTERN      = 'lib%s.a'

	v.LINKFLAGS_MACBUNDLE = ['-bundle', '-undefined', 'dynamic_lookup']
	v.CFLAGS_MACBUNDLE    = ['-fPIC']
	v.macbundle_PATTERN   = '%s.bundle'

@conf
def gcc_modifier_win32(conf):
	"""Configuration flags for executing gcc on Windows"""
	v = conf.env
	v.cprogram_PATTERN    = '%s.exe'

	v.cshlib_PATTERN      = '%s.dll'
	v.implib_PATTERN      = '%s.dll.a'
	v.IMPLIB_ST           = '-Wl,--out-implib,%s'

	v.CFLAGS_cshlib       = []

	# Auto-import is enabled by default even without this option,
	# but enabling it explicitly has the nice effect of suppressing the rather boring, debug-level messages
	# that the linker emits otherwise.
	v.append_value('LINKFLAGS', ['-Wl,--enable-auto-import'])

@conf
def gcc_modifier_cygwin(conf):
	"""Configuration flags for executing gcc on Cygwin"""
	gcc_modifier_win32(conf)
	v = conf.env
	v.cshlib_PATTERN = 'cyg%s.dll'
	v.append_value('LINKFLAGS_cshlib', ['-Wl,--enable-auto-image-base'])
	v.CFLAGS_cshlib = []

@conf
def gcc_modifier_darwin(conf):
	"""Configuration flags for executing gcc on MacOS"""
	v = conf.env
	v.CFLAGS_cshlib       = ['-fPIC']
	v.LINKFLAGS_cshlib    = ['-dynamiclib']
	v.cshlib_PATTERN      = 'lib%s.dylib'
	v.FRAMEWORKPATH_ST    = '-F%s'
	v.FRAMEWORK_ST        = ['-framework']
	v.ARCH_ST             = ['-arch']

	v.LINKFLAGS_cstlib    = []

	v.SHLIB_MARKER        = []
	v.STLIB_MARKER        = []
	v.SONAME_ST           = []

@conf
def gcc_modifier_aix(conf):
	"""Configuration flags for executing gcc on AIX"""
	v = conf.env
	v.LINKFLAGS_cprogram  = ['-Wl,-brtl']
	v.LINKFLAGS_cshlib    = ['-shared','-Wl,-brtl,-bexpfull']
	v.SHLIB_MARKER        = []

@conf
def gcc_modifier_hpux(conf):
	v = conf.env
	v.SHLIB_MARKER        = []
	v.STLIB_MARKER        = []
	v.CFLAGS_cshlib       = ['-fPIC','-DPIC']
	v.cshlib_PATTERN      = 'lib%s.sl'

@conf
def gcc_modifier_openbsd(conf):
	conf.env.SONAME_ST = []

@conf
def gcc_modifier_osf1V(conf):
	v = conf.env
	v.SHLIB_MARKER        = []
	v.STLIB_MARKER        = []
	v.SONAME_ST           = []

@conf
def gcc_modifier_platform(conf):
	"""Execute platform-specific functions based on *gcc_modifier_+NAME*"""
	# * set configurations specific for a platform.
	# * the destination platform is detected automatically by looking at the macros the compiler predefines,
	#   and if it's not recognised, it fallbacks to sys.platform.
	gcc_modifier_func = getattr(conf, 'gcc_modifier_' + conf.env.DEST_OS, None)
	if gcc_modifier_func:
		gcc_modifier_func()

def configure(conf):
	"""
	Configuration for gcc
	"""
	conf.find_gcc()
	conf.find_ar()
	conf.gcc_common_flags()
	conf.gcc_modifier_platform()
	conf.cc_load_tools()
	conf.cc_add_flags()
	conf.link_add_flags()
	conf.check_gcc_o_space()

