rt-thread-official/components/libc/compilers/newlib/SConscript

import os
from building import *
from gcc import *
Import('rtconfig')

group = []

newlib_version = GetNewLibVersion(rtconfig)

if newlib_version and not GetDepend('RT_USING_EXTERNAL_LIBC'):
    print('Newlib version: ' + newlib_version)

    cwd = GetCurrentDir()
    src = Glob('*.c')

    CPPPATH = [cwd]
    CPPDEFINES = ['RT_USING_NEWLIBC', 'RT_USING_LIBC', '_POSIX_C_SOURCE=1'] # identify this is Newlib, and only enable POSIX.1-1990
    LIBS = ['c', 'm'] # link libc and libm
    AddDepend(['RT_USING_NEWLIBC', 'RT_USING_LIBC'])

    group = group + DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES, LIBS = LIBS)

    list = os.listdir(cwd)
    for d in list:
        path = os.path.join(cwd, d)
        if os.path.isfile(os.path.join(path, 'SConscript')):
            group = group + SConscript(os.path.join(d, 'SConscript'))

Return('group')