mapnik/scons/scons-local-4.8.1/SCons/Platform/posix.py

# MIT License
#
# Copyright The SCons Foundation
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"""Platform-specific initialization for POSIX (Linux, UNIX, etc.) systems.

There normally shouldn't be any need to import this module directly.  It
will usually be imported through the generic SCons.Platform.Platform()
selection method.
"""

import platform
import subprocess

from SCons.Platform import TempFileMunge
from SCons.Platform.virtualenv import ImportVirtualenv
from SCons.Platform.virtualenv import ignore_virtualenv, enable_virtualenv

exitvalmap = {
    2 : 127,
    13 : 126,
}

def escape(arg):
    """escape shell special characters"""
    slash = '\\'
    special = '"$'

    arg = arg.replace(slash, slash+slash)
    for c in special:
        arg = arg.replace(c, slash+c)

    # print("ESCAPE RESULT: %s" % arg)
    return '"' + arg + '"'


def exec_subprocess(l, env):
    proc = subprocess.Popen(l, env = env, close_fds = True)
    return proc.wait()

def subprocess_spawn(sh, escape, cmd, args, env):
    return exec_subprocess([sh, '-c', ' '.join(args)], env)

def exec_popen3(l, env, stdout, stderr):
    proc = subprocess.Popen(l, env = env, close_fds = True,
                            stdout = stdout,
                            stderr = stderr)
    return proc.wait()

def piped_env_spawn(sh, escape, cmd, args, env, stdout, stderr):
    # spawn using Popen3 combined with the env command
    # the command name and the command's stdout is written to stdout
    # the command's stderr is written to stderr
    return exec_popen3([sh, '-c', ' '.join(args)],
                       env, stdout, stderr)


def generate(env) -> None:
    # Bearing in mind we have python 2.4 as a baseline, we can just do this:
    spawn = subprocess_spawn
    pspawn = piped_env_spawn
    # Note that this means that 'escape' is no longer used

    if 'ENV' not in env:
        env['ENV']        = {}
    env['ENV']['PATH']    = '/usr/local/bin:/opt/bin:/bin:/usr/bin:/snap/bin'
    env['OBJPREFIX']      = ''
    env['OBJSUFFIX']      = '.o'
    env['SHOBJPREFIX']    = '$OBJPREFIX'
    env['SHOBJSUFFIX']    = '$OBJSUFFIX'
    env['PROGPREFIX']     = ''
    env['PROGSUFFIX']     = ''
    env['LIBPREFIX']      = 'lib'
    env['LIBSUFFIX']      = '.a'
    env['SHLIBPREFIX']    = '$LIBPREFIX'
    env['SHLIBSUFFIX']    = '.so'
    env['LIBPREFIXES']    = ['$LIBPREFIX']
    env['LIBSUFFIXES']    = ['$LIBSUFFIX', '$SHLIBSUFFIX']
    env['LIBLITERALPREFIX'] = ''
    env['HOST_OS']        = 'posix'
    env['HOST_ARCH']      = platform.machine()
    env['PSPAWN']         = pspawn
    env['SPAWN']          = spawn
    env['SHELL']          = 'sh'
    env['ESCAPE']         = escape
    env['TEMPFILE']       = TempFileMunge
    env['TEMPFILEPREFIX'] = '@'
    #Based on LINUX: ARG_MAX=ARG_MAX=131072 - 3000 for environment expansion
    #Note: specific platforms might rise or lower this value
    env['MAXLINELENGTH']  = 128072

    # This platform supports RPATH specifications.
    env['__RPATH'] = '$_RPATH'

    # GDC is GCC family, but DMD and LDC have different options.
    # Must be able to have GCC and DMD work in the same build, so:
    env['__DRPATH'] = '$_DRPATH'

    if enable_virtualenv and not ignore_virtualenv:
        ImportVirtualenv(env)

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