зеркало из https://github.com/mozilla/pjs.git
74 строки
2.3 KiB
Python
Executable File
74 строки
2.3 KiB
Python
Executable File
#!/usr/bin/python
|
|
|
|
# This script find the version of libstdc++ and prints it as single number
|
|
# with 8 bits per element. For example, GLIBCXX_3.4.10 becomes
|
|
# 3 << 16 | 4 << 8 | 10 = 197642. This format is easy to use
|
|
# in the C preprocessor.
|
|
|
|
# We find out both the host and target versions. Since the output
|
|
# will be used from shell, we just print the two assignments and evaluate
|
|
# them from shell.
|
|
|
|
import os
|
|
import subprocess
|
|
import re
|
|
|
|
re_for_ld = re.compile('.*\((.*)\).*')
|
|
|
|
def parse_readelf_line(x):
|
|
"""Return the version from a readelf line that looks like:
|
|
0x00ec: Rev: 1 Flags: none Index: 8 Cnt: 2 Name: GLIBCXX_3.4.6
|
|
"""
|
|
return x.split(':')[-1].split('_')[-1].strip()
|
|
|
|
def parse_ld_line(x):
|
|
"""Parse a line from the output of ld -t. The output of gold is just
|
|
the full path, gnu ld prints "-lstdc++ (path)".
|
|
"""
|
|
t = re_for_ld.match(x)
|
|
if t:
|
|
return t.groups()[0].strip()
|
|
return x.strip()
|
|
|
|
def split_ver(v):
|
|
"""Covert the string '1.2.3' into the list [1,2,3]
|
|
"""
|
|
return [int(x) for x in v.split('.')]
|
|
|
|
def cmp_ver(a, b):
|
|
"""Compare versions in the form 'a.b.c'
|
|
"""
|
|
for (i, j) in zip(split_ver(a), split_ver(b)):
|
|
if i != j:
|
|
return i - j
|
|
return 0
|
|
|
|
def encode_ver(v):
|
|
"""Encode the version as a single number.
|
|
"""
|
|
t = split_ver(v)
|
|
return t[0] << 16 | t[1] << 8 | t[2]
|
|
|
|
def find_version(e):
|
|
"""Given the value of environment variable CXX or HOST_CXX, find the
|
|
version of the libstdc++ it uses.
|
|
"""
|
|
args = e.split()
|
|
args += ['-shared', '-Wl,-t']
|
|
p = subprocess.Popen(args, stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
|
|
candidates = [x for x in p.stdout if 'libstdc++.so' in x]
|
|
assert len(candidates) == 1
|
|
libstdcxx = parse_ld_line(candidates[-1])
|
|
|
|
p = subprocess.Popen(['readelf', '-V', libstdcxx], stdout=subprocess.PIPE)
|
|
versions = [parse_readelf_line(x)
|
|
for x in p.stdout.readlines() if 'Name: GLIBCXX' in x]
|
|
last_version = sorted(versions, cmp = cmp_ver)[-1]
|
|
return encode_ver(last_version)
|
|
|
|
if __name__ == '__main__':
|
|
cxx_env = os.environ['CXX']
|
|
print 'MOZ_LIBSTDCXX_TARGET_VERSION=%s' % find_version(cxx_env)
|
|
host_cxx_env = os.environ.get('HOST_CXX', cxx_env)
|
|
print 'MOZ_LIBSTDCXX_HOST_VERSION=%s' % find_version(host_cxx_env)
|