Add nacl-clang testing to SCons

tests/fixedfeaturecpu/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.
 
 # Tests for Native Client fixed-feature CPU mode. The fixed-feature CPU
 # mode requires SSE and disallows MMX and x87. By fixing the instruction set
 # it allows exclusion of the CPUID instruction and use of a read-only text
 # segment. See http://code.google.com/p/nativeclient/issues/detail?id=2684
 Import('env')
@@ skipping 42 matching lines @@
     expect_null_Z_status=127
     expect_sse_Z_status=127
     expect_x87_Z_status=127
   elif env.Bit('target_x86_64'):
     # 64-bit glibc: fails, runnable-ld.so requires RDTSC, x87
     expect_null_Z_status=1
     expect_sse_Z_status=1
     expect_x87_Z_status=1
 else:
   if env.Bit('target_x86_32'):
-    # 32-bit newlib: passes
-    expect_null_Z_status=0
+    # 32-bit newlib: passes, except nacl-clang's ff_null_z for reasons which
+    # are unknown because ncval is broken and ncval_new doesn't support

[Nick Bray (chromium), 2014/10/10 19:53:25]

https://groups.google.com/forum/#!msg/native-client-discuss/7ORdpmZL0RI/p8GFB...

[Derek Schuff, 2014/10/10 20:56:24]

OK. but it doesn't help me in finding out the reason validation fails (i.e. what
is linked into the nexe that is not supported by the fixed feature mode)

+    # FF mode.
+    if env.Bit('nacl_clang'):
+      expect_null_Z_status=1
+    else:
+      expect_null_Z_status=0
     expect_sse_Z_status=1
     expect_x87_Z_status=1
   elif env.Bit('target_x86_64'):
     # R-DFA ignores LM bit and assumes it's always enabled
     expect_null_Z_status=0
     expect_sse_Z_status=0
     expect_x87_Z_status=1
 
 test_suites = ['small_tests', 'sel_ldr_tests', 'validator_tests']
 ff_null_nexe = env.ComponentProgram('ff_null', 'ff_null.c',
@@ skipping 30 matching lines @@
       'ff_hello_world_sse_Z.out', ff_hello_world_sse_nexe,
       exit_status=expect_sse_Z_status,
       sel_ldr_flags=['-Z'])
   env.AddNodeToTestSuite(node, test_suites, 'run_ff_sse_Z_test',
                          is_broken=is_validation_broken)
 
 # NOTE: -mfpmath=387 does not work for x86-64. See:
 # http://code.google.com/p/nativeclient/issues/detail?id=2692
 if not env.Bit('target_x86_64') and not env.Bit('bitcode'):
   x87_env = env.Clone()
-  x87_env.Append(CCFLAGS=['-mfpmath=387'])
+  x87_env.Append(CCFLAGS=['-mfpmath=387', '-mno-sse'])
   x87_o = x87_env.ComponentObject('ff_hello_world_x87.o', 'ff_hello_world.c')
   ff_hello_world_x87_nexe = x87_env.ComponentProgram(
       'ff_hello_world_x87',
       'ff_hello_world_x87.o',
       EXTRA_LIBS=['${NONIRT_LIBS}'])
 
   # ff_hello_world_x87 should pass in default mode
   node = env.CommandSelLdrTestNacl(
       'ff_hello_world_x87.out', ff_hello_world_x87_nexe,
       stdout_golden=env.File('ff_hello_world.stdout'))
   env.AddNodeToTestSuite(node, test_suites, 'run_ff_x87_test')
 
   # ff_hello_world_x87 should fail in fixed function CPU mode
   node = env.CommandSelLdrTestNacl(
       'ff_hello_world_x87_Z.out', ff_hello_world_x87_nexe,
       exit_status=expect_x87_Z_status,
       sel_ldr_flags=['-Z'])
   env.AddNodeToTestSuite(node, test_suites, 'run_ff_x87_Z_test',
                          is_broken=is_validation_broken)