Add glibc back compat code

To ensure that the binaries compiled by gitian run across many linux
distributions, enforce 2.17 as the minimum libc version supported.

2 files changed, 1 insertions, 164 deletions

diff --git a/contrib/gitian/gitian-linux.yml b/contrib/gitian/gitian-linux.yml
index 473a7720d..3bb25c314 100644
--- a/contrib/gitian/gitian-linux.yml
+++ b/contrib/gitian/gitian-linux.yml
@@ -152,7 +152,7 @@ script: |
   for i in ${HOSTS}; do
     export PATH=${BASEPREFIX}/${i}/native/bin:${ORIGPATH}
     mkdir build && cd build
-    cmake .. -DCMAKE_TOOLCHAIN_FILE=${BASEPREFIX}/${i}/share/toolchain.cmake
+    cmake .. -DCMAKE_TOOLCHAIN_FILE=${BASEPREFIX}/${i}/share/toolchain.cmake -DBACKCOMPAT=ON
     make
     DISTNAME=monero-${i}
     mv bin ${DISTNAME}
diff --git a/contrib/gitian/symbol-check.py b/contrib/gitian/symbol-check.py
deleted file mode 100755
index 6808e77da..000000000
--- a/contrib/gitian/symbol-check.py
+++ /dev/null
@@ -1,163 +0,0 @@
-#!/usr/bin/env python3
-# Copyright (c) 2014 Wladimir J. van der Laan
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-'''
-A script to check that the (Linux) executables produced by gitian only contain
-allowed gcc, glibc and libstdc++ version symbols.  This makes sure they are
-still compatible with the minimum supported Linux distribution versions.
-
-Example usage:
-
-    find ../gitian-builder/build -type f -executable | xargs python contrib/devtools/symbol-check.py
-'''
-import subprocess
-import re
-import sys
-import os
-
-# Debian 6.0.9 (Squeeze) has:
-#
-# - g++ version 4.4.5 (https://packages.debian.org/search?suite=default&section=all&arch=any&searchon=names&keywords=g%2B%2B)
-# - libc version 2.11.3 (https://packages.debian.org/search?suite=default&section=all&arch=any&searchon=names&keywords=libc6)
-# - libstdc++ version 4.4.5 (https://packages.debian.org/search?suite=default&section=all&arch=any&searchon=names&keywords=libstdc%2B%2B6)
-#
-# Ubuntu 10.04.4 (Lucid Lynx) has:
-#
-# - g++ version 4.4.3 (http://packages.ubuntu.com/search?keywords=g%2B%2B&searchon=names&suite=lucid&section=all)
-# - libc version 2.11.1 (http://packages.ubuntu.com/search?keywords=libc6&searchon=names&suite=lucid&section=all)
-# - libstdc++ version 4.4.3 (http://packages.ubuntu.com/search?suite=lucid&section=all&arch=any&keywords=libstdc%2B%2B&searchon=names)
-#
-# Taking the minimum of these as our target.
-#
-# According to GNU ABI document (http://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html) this corresponds to:
-#   GCC 4.4.0: GCC_4.4.0
-#   GCC 4.4.2: GLIBCXX_3.4.13, CXXABI_1.3.3
-#   (glibc)    GLIBC_2_11
-#
-MAX_VERSIONS = {
-'GCC':     (4,4,0),
-'CXXABI':  (1,3,3),
-'GLIBCXX': (3,4,13),
-'GLIBC':   (2,11)
-}
-# See here for a description of _IO_stdin_used:
-# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#109
-
-# Ignore symbols that are exported as part of every executable
-IGNORE_EXPORTS = {
-'_edata', '_end', '_init', '__bss_start', '_fini', '_IO_stdin_used', 'stdin', 'stdout', 'stderr'
-}
-READELF_CMD = os.getenv('READELF', '/usr/bin/readelf')
-CPPFILT_CMD = os.getenv('CPPFILT', '/usr/bin/c++filt')
-# Allowed NEEDED libraries
-ALLOWED_LIBRARIES = {
-# bitcoind and bitcoin-qt
-'libgcc_s.so.1', # GCC base support
-'libc.so.6', # C library
-'libpthread.so.0', # threading
-'libanl.so.1', # DNS resolve
-'libm.so.6', # math library
-'librt.so.1', # real-time (clock)
-'ld-linux-x86-64.so.2', # 64-bit dynamic linker
-'ld-linux.so.2', # 32-bit dynamic linker
-# bitcoin-qt only
-'libX11-xcb.so.1', # part of X11
-'libX11.so.6', # part of X11
-'libxcb.so.1', # part of X11
-'libfontconfig.so.1', # font support
-'libfreetype.so.6', # font parsing
-'libdl.so.2' # programming interface to dynamic linker
-}
-
-class CPPFilt(object):
-    '''
-    Demangle C++ symbol names.
-
-    Use a pipe to the 'c++filt' command.
-    '''
-    def __init__(self):
-        self.proc = subprocess.Popen(CPPFILT_CMD, stdin=subprocess.PIPE, stdout=subprocess.PIPE, universal_newlines=True)
-
-    def __call__(self, mangled):
-        self.proc.stdin.write(mangled + '\n')
-        self.proc.stdin.flush()
-        return self.proc.stdout.readline().rstrip()
-
-    def close(self):
-        self.proc.stdin.close()
-        self.proc.stdout.close()
-        self.proc.wait()
-
-def read_symbols(executable, imports=True):
-    '''
-    Parse an ELF executable and return a list of (symbol,version) tuples
-    for dynamic, imported symbols.
-    '''
-    p = subprocess.Popen([READELF_CMD, '--dyn-syms', '-W', executable], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
-    (stdout, stderr) = p.communicate()
-    if p.returncode:
-        raise IOError('Could not read symbols for %s: %s' % (executable, stderr.strip()))
-    syms = []
-    for line in stdout.splitlines():
-        line = line.split()
-        if len(line)>7 and re.match('[0-9]+:$', line[0]):
-            (sym, _, version) = line[7].partition('@')
-            is_import = line[6] == 'UND'
-            if version.startswith('@'):
-                version = version[1:]
-            if is_import == imports:
-                syms.append((sym, version))
-    return syms
-
-def check_version(max_versions, version):
-    if '_' in version:
-        (lib, _, ver) = version.rpartition('_')
-    else:
-        lib = version
-        ver = '0'
-    ver = tuple([int(x) for x in ver.split('.')])
-    if not lib in max_versions:
-        return False
-    return ver <= max_versions[lib]
-
-def read_libraries(filename):
-    p = subprocess.Popen([READELF_CMD, '-d', '-W', filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, universal_newlines=True)
-    (stdout, stderr) = p.communicate()
-    if p.returncode:
-        raise IOError('Error opening file')
-    libraries = []
-    for line in stdout.splitlines():
-        tokens = line.split()
-        if len(tokens)>2 and tokens[1] == '(NEEDED)':
-            match = re.match('^Shared library: \[(.*)\]$', ' '.join(tokens[2:]))
-            if match:
-                libraries.append(match.group(1))
-            else:
-                raise ValueError('Unparseable (NEEDED) specification')
-    return libraries
-
-if __name__ == '__main__':
-    cppfilt = CPPFilt()
-    retval = 0
-    for filename in sys.argv[1:]:
-        # Check imported symbols
-        for sym,version in read_symbols(filename, True):
-            if version and not check_version(MAX_VERSIONS, version):
-                print('%s: symbol %s from unsupported version %s' % (filename, cppfilt(sym), version))
-                retval = 1
-        # Check exported symbols
-        for sym,version in read_symbols(filename, False):
-            if sym in IGNORE_EXPORTS:
-                continue
-            print('%s: export of symbol %s not allowed' % (filename, cppfilt(sym)))
-            retval = 1
-        # Check dependency libraries
-        for library_name in read_libraries(filename):
-            if library_name not in ALLOWED_LIBRARIES:
-                print('%s: NEEDED library %s is not allowed' % (filename, library_name))
-                retval = 1
-
-    sys.exit(retval)
-
-