PNaCl driver: Add libgcc to mixed native/bitcode links

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 534 matching lines @@
                          'run_pic_constant_test')
 
 WRAP_LINK_FLAGS = ['-Wl,--wrap=foo', '-Wl,--wrap=bar']
 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', '${NONIRT_LIBS}'])
 node = env.CommandSelLdrTestNacl('wrap.out', nexe,
                                  stdout_golden=env.File('wrap.stdout'))
 env.AddNodeToTestSuite(node, ['toolchain_tests','small_tests'], 'run_wrap_test')
+
+if (env.Bit('target_x86_32') and env.Bit('bitcode') and
+    not env.Bit('pnacl_generate_pexe') and
+    env['TOOLCHAIN_FEATURE_VERSION'] >= 7):
+  # This test compiles a file that will need to generate a call to a compiler-rt
+  # function (__udivdi3) on x86-32. Ensure that when we pre-translate to a
+  # native object file, libgcc is included in the bitcode link to satisfy the
+  # reference.
+  mixedlink_env = env.Clone()
+  mixedlink_env.Append(CCFLAGS=['--pnacl-allow-translate',
+                                '--pnacl-allow-native',
+                                '-arch', 'x86-32'])
+  mixedlink_env.Append(LINKFLAGS=['--pnacl-allow-translate',
+                                  '--pnacl-allow-native',
+                                  '-arch', 'x86-32'])
+  nexe = mixedlink_env.ComponentProgram('libgcc_mixed_link', 'needs_libgcc.c',
+                                        EXTRA_LIBS=['${NONIRT_LIBS}'])
+  node = mixedlink_env.CommandSelLdrTestNacl('libgcc_mixed_link.out', nexe,
+                                             ['9', '3'])
+  mixedlink_env.AddNodeToTestSuite(node, ['nonpexe_tests', 'small_tests'],
+                                   'run_libgcc_mixed_link_test')