#
# Set the ARCH environment variable for uClibc compilation.
# Return value must match one of the architectures known to uClibc:
# libc/sysdeps/*/*
#

valid_archs = "\
alpha \
arm \
avr32 \
bfin \
c6x \
cris \
e1 \
frv \
h8300 \
hppa \
i386 \
i960 \
ia64 \
m68k \
microblaze \
mips \
nios \
nios2 \
powerpc \
sh \
sh64 \
sparc \
v850 \
vax \
x86_64 \
xtensa \
"
def map_uclibc_arch(a, d):
    """Return the uClibc architecture for the given TARGET_ARCH."""
    import re

    valid_archs = d.getVar('valid_archs', True).split()

    if re.match('^(arm|sa110).*', a):
        return 'arm'
    elif re.match('^(i.86|athlon)$', a):
        return 'i386'
    elif re.match('^mips.*', a):
        return 'mips'
    elif re.match('^parisc.*', a):
        return 'hppa'
    elif re.match('^ppc.*', a):
        return 'powerpc'
    elif re.match('^s390.*', a):
        return 's390'
    elif re.match('^sh.*', a):
        return 'sh'
    elif re.match('^(sun|sparc).*', a):
        return 'sparc'
    elif re.match('^xtensa.*', a):
        return 'xtensa'
    elif a in valid_archs:
        return a
    else:
        bb.error("cannot map '%s' to a uClibc architecture" % a)

export UCLIBC_ARCH = "${@map_uclibc_arch(d.getVar('TARGET_ARCH', True), d)}"

def map_uclibc_abi(o, d):
    """Return the uClibc ABI for the given TARGET_OS."""
    import re

    arch = d.getVar('TARGET_ARCH', True)
    if map_uclibc_arch(d.getVar('TARGET_ARCH', True), d) == "arm":
        if re.match('.*eabi$', o):
            return 'ARM_EABI'
        else:
            return 'ARM_OABI'
    # FIXME: This is inaccurate! Handle o32, n32, n64
    elif re.match('^mips.*64$', arch):
        return 'MIPS_N64_ABI'
    elif re.match('^mips.*', arch):
        return 'MIPS_O32_ABI'
    return ""

export UCLIBC_ABI = "${@map_uclibc_abi(d.getVar('TARGET_OS', True), d)}"

def map_uclibc_endian(a, d):
    """Return the uClibc endianess for the given TARGET_ARCH."""
    import re

    # Always BE
    if re.match('^(avr32|e1|frv|(parisc|hppa)|m68k|microblaze|powerpc.*|(sparc|sun).*)$', a):
        return 'BIG'
    # Possibly BE
    elif re.match('^(((arm|sa110).*eb)|h8300.*eb|(parisc|hppa).*eb|mips|mips64|sh.*eb|xtensa.*eb)$', a):
        return 'BIG'
    return 'LITTLE'

export UCLIBC_ENDIAN = "${@map_uclibc_endian(d.getVar('TARGET_ARCH', True), d)}"

# internal helper
def uclibc_cfg(feature, features, tokens, cnf, rem):
    if type(tokens) == type(""):
        tokens = [tokens]
    rem.extend(['/^[# ]*' + token + '[ =]/d' for token in tokens])
    if type(features) == type([]) and feature in features:
        cnf.extend([token + '=y' for token in tokens])
    else:
        cnf.extend(['# ' + token + ' is not set' for token in tokens])

# Map distro features to config settings
def features_to_uclibc_settings(d):
    cnf, rem = ([], [])
    distro_features = d.getVar('DISTRO_FEATURES', True).split()
    uclibc_cfg('ipv4',      distro_features, 'UCLIBC_HAS_IPV4', cnf, rem)
    uclibc_cfg('ipv6',      distro_features, 'UCLIBC_HAS_IPV6', cnf, rem)
    uclibc_cfg('largefile', distro_features, 'UCLIBC_HAS_LFS', cnf, rem)
    uclibc_cfg('nls',       distro_features, 'UCLIBC_HAS_LOCALE', cnf, rem)
    uclibc_cfg('thumb-interwork', distro_features,'USE_BX', cnf, rem)
    uclibc_cfg('xattr',     distro_features, 'UCLIBC_HAS_XATTR', cnf, rem)
    uclibc_cfg('ssp',       distro_features, 'UCLIBC_HAS_SSP', cnf, rem)
    uclibc_cfg('argp',       distro_features, 'UCLIBC_HAS_ARGP', cnf, rem)
    uclibc_cfg('libc-posix-clang-wchar',  distro_features,'UCLIBC_HAS_WCHAR', cnf, rem)
    return "\n".join(cnf), "\n".join(rem)
# X, Y = ${@features_to_uclibc_settings(d)}
# unfortunately doesn't seem to work with bitbake, workaround:
def features_to_uclibc_conf(d):
    cnf, rem = features_to_uclibc_settings(d)
    return cnf
def features_to_uclibc_del(d):
    cnf, rem = features_to_uclibc_settings(d)
    return rem