Introduce model of global initializers in Subzero.

pydir/crosstest.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import re
 import subprocess
 import sys
 import tempfile
 
 from utils import shellcmd
@@ skipping 86 matching lines @@
 
         base_sz = '%s.O%s.%s' % (base, args.optlevel, args.target)
         asm_sz = os.path.join(args.dir, base_sz + '.sz.s')
         obj_sz = os.path.join(args.dir, base_sz + '.sz.o')
         obj_llc = os.path.join(args.dir, base + '.llc.o')
         shellcmd(['../llvm2ice',
                   '-O' + args.optlevel,
                   '-mattr=' + args.attr,
                   '--target=' + args.target,
                   '--prefix=' + args.prefix,
+                  '-allow-uninitialized-globals',
                   '-o=' + asm_sz,
                   bitcode])
         shellcmd(['llvm-mc',
                   '-arch=' + arch_map[args.target],
                   '-x86-asm-syntax=intel',
                   '-filetype=obj',
                   '-o=' + obj_sz,
                   asm_sz])
         objs.append(obj_sz)
         # Each original bitcode file needs to be translated by the
@@ skipping 23 matching lines @@
             objs.append(bitcode)
 
     # Use 'clang szrt.c'  -or-  'clang++ szrt.cpp'
     objs.append((
             '{root}/toolchain_build/src/subzero/runtime/szrt.{ext}'
             ).format(root=nacl_root, ext='c' if pure_c else 'cpp'))
     linker = 'clang' if pure_c else 'clang++'
     shellcmd([linker, '-g', '-m32', args.driver] +
              objs +
              ['-lm', '-lpthread', '-o', os.path.join(args.dir, args.output)])