Expose LLC's -force-align-stack flag to pnacl-translate

tests/toolchain/nacl.scons

 # -*- python -*-
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 Import('env')
 
 # force inclusion of entire library, so that we can validate it
 # NOTE: This approach does not work for -lc because of tons of
 #       undefined symbols which would have to be stubbed out
@@ skipping 537 matching lines @@
 env.ComponentLibrary('wrap_lib', ['wrap_lib1.c', 'wrap_lib2.c'])
 nexe = env.ComponentProgram('wrap', ['wrap_main.c'],
                             EXTRA_LINKFLAGS=WRAP_LINK_FLAGS,
                             EXTRA_LIBS=['wrap_lib', '${NONIRT_LIBS}'])
 node = env.CommandSelLdrTestNacl('wrap.out', nexe,
                                  stdout_golden=env.File('wrap.stdout'))
 env.AddNodeToTestSuite(node, ['toolchain_tests','small_tests'], 'run_wrap_test')
 
 if (env.Bit('target_x86_32') and env.Bit('bitcode') and
     not env.Bit('pnacl_generate_pexe') and
-    env['TOOLCHAIN_FEATURE_VERSION'] >= 7):
+    env['TOOLCHAIN_FEATURE_VERSION'] >= 8):
   # This test compiles a file that will need to generate a call to a compiler-rt
   # function (__udivdi3) on x86-32. Ensure that when we pre-translate to a
   # native object file, libgcc is included in the bitcode link to satisfy the
   # reference.
   mixedlink_env = env.Clone()
   mixedlink_env.Append(CCFLAGS=['--pnacl-allow-translate',
                                 '--pnacl-allow-native',
                                 '-arch', 'x86-32'])
   mixedlink_env.Append(LINKFLAGS=['--pnacl-allow-translate',
                                   '--pnacl-allow-native',
                                   '-arch', 'x86-32'])
+
   nexe = mixedlink_env.ComponentProgram('libgcc_mixed_link', 'needs_libgcc.c',
                                         EXTRA_LIBS=['${NONIRT_LIBS}'])
   node = mixedlink_env.CommandSelLdrTestNacl('libgcc_mixed_link.out', nexe,
                                              ['9', '3'])
-  mixedlink_env.AddNodeToTestSuite(node, ['nonpexe_tests', 'small_tests'],
+  mixedlink_env.AddNodeToTestSuite(node, ['nonpexe_tests', 'small_tests',
+                                          'toolchain_tests'],
                                    'run_libgcc_mixed_link_test')
+
+  # This tests the translator's -force-align-stack flag, which means that the
+  # compiler cannot assume that the stack pointer is aligned to a 16-byte
+  # boundary, and must force realignment on entry to each function.
+  mixedlink_env.Append(ASFLAGS=['-arch', 'x86-32'])
+  mixedlink_env.Append(CCFLAGS=['-Wt,-force-align-stack'])
+  nexe = mixedlink_env.ComponentProgram(
+      'stackalign_test',
+      ['call_with_misaligned_stack.S', 'stackalign_test.c'],
+      EXTRA_LIBS=['${NONIRT_LIBS}'])
+  node = mixedlink_env.CommandSelLdrTestNacl('stackalign.out', nexe)
+  mixedlink_env.AddNodeToTestSuite(
+      node,
+      ['nonpexe_tests', 'small_tests', 'toolchain_tests'],
+      'run_stackalign_test')