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# This is free software: you can redistribute it and/or modify it

# under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

# General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program. If not, see

# <http://www.gnu.org/licenses/>.

import os

import shutil

from subprocess import Popen, PIPE, check_output

import sys

def indent(prefix, text):

text = str(text)

return '\n'.join([prefix + line

for line in text.splitlines()])

class ConfigurationFailure(Exception):

pass

class CheckFor:

"""

Context manager for wrapping a feature test

The feature test should raise ConfigurationFailure to signify a failure

"""

def __init__(self, initmsg, mandatory, okmsg=None, failmsg='failed'):

self.initmsg = initmsg

self.mandatory = mandatory

self.okmsg = okmsg

self.failmsg = failmsg

self.result = None

# context manager hooks:

def __enter__(self):

sys.stdout.write('%s... ' % self.initmsg) # no newline

return self

def __exit__(self, exc_type, exc_val, exc_tb):

if exc_type:

# exception occurred:

self.result = False

# is it one of ours, signifiying the failure of a test?

if isinstance(exc_val, ConfigurationFailure):

# Write the failure message:

sys.stdout.write('%s\n' % self.failmsg)

if self.mandatory:

# Print diagnostic information:

print(exc_val)

# terminate the build

sys.exit(1)

else:

return True # swallow the exception

else:

# some kind of unexpected error; propagate it:

return False

else:

# Assume success:

self.result = True

# Write the success message:

if self.okmsg:

sys.stdout.write('%s\n' % self.okmsg)

def succeeded(self):

# Did this test succeed?

return self.result

class Result:

pass

class OptionFlag(Result):

# the outcome of a feature test

def __init__(self, description, flag, defn):

self.description = description

self.flag = flag

self.defn = defn

def write_to(self, f):

f.write('/* %s */\n' % self.description)

if self.flag:

f.write('#define %s\n\n' % self.defn)

else:

f.write('#undef %s\n\n' % self.defn)

class ConfigBuilder:

def __init__(self, argv):

import argparse

parser = argparse.ArgumentParser()

parser.add_argument('-o', '--output-file')

args = parser.parse_args(argv[1:])

#print(args)

self.filename = args.output_file

self.dirname = 'config-tests'

if os.path.exists(self.dirname):

shutil.rmtree(self.dirname)

os.mkdir(self.dirname)

self.testid = 0

self.results = []

def make_test_dir(self, test):

self.testid += 1

dirname = ('%05i-' % self.testid) + test.initmsg

dirname = '-'.join(dirname.split())

dirpath = os.path.join(self.dirname, dirname)

os.mkdir(dirpath)

return dirpath

def write_outcome(self):

sys.stdout.write('writing %s\n' % self.filename)

with open(self.filename, 'w') as f:

f.write('/* autogenerated header file */\n\n')

for r in self.results:

r.write_to(f)

def compile(self, test, src, extraargs):

dirpath = self.make_test_dir(test)

srcpath = os.path.join(dirpath, 'feature-test.c')

with open(srcpath, 'w') as f:

f.write(src)

outpath = os.path.join(dirpath, 'feature-test.o')

args= [os.environ.get('CC', 'gcc'),

'-c', # don't run the linker (no main)

'-o', outpath]

args += extraargs

args += [srcpath]

p = Popen(args, stdout=PIPE, stderr=PIPE)

stdout, stderr = p.communicate()

c = p.wait()

if c != 0:

class CompilationError(ConfigurationFailure):

def __str__(self):

result = 'Test compilation failed with exit code %i\n' % c

result += ' The command was:\n'

result += ' %s\n' % ' '.join(args)

result += ' The source was: (in %s)\n' % srcpath

result += indent(' ', src) + '\n'

result += ' The stderr was:\n'

result += indent(' ', stderr) + '\n'

return result

raise CompilationError()

def capture_shell_output(self, initmsg, cmd):

with CheckFor(initmsg,

mandatory=True) as test:

out = check_output(cmd,

shell=True) # input must be trusted

out = str(out.decode())

sys.stdout.write('%s\n' % out.strip())

return out

def test_for_mandatory_c_header(self, header, extraargs):

with CheckFor('checking for %s' % header,

okmsg='found',

failmsg='not found',

mandatory=True) as test:

self.compile(test,

src='#include <%s>' % header,

extraargs=extraargs)

def test_c_compilation(self, initmsg, src, extraargs, description, defn):

with CheckFor(initmsg,

okmsg='yes',

failmsg='no',

mandatory=False) as test:

self.compile(test,

src,

extraargs)

self.results.append(OptionFlag(description,

test.succeeded(),

defn))

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