Updated scripts to call python2 directly rather than relying on python symlink pointing to the right place. See PEP394 for details on why this should be OK.

1 files changed, 173 insertions, 149 deletions

diff --git a/tests/runner.py b/tests/runner.py
index 1ab06164..29deeb44 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # This Python file uses the following encoding: utf-8
 
 '''
@@ -3499,7 +3499,7 @@ The current type of b is: 9
         Building.link([supp_name + '.o', main_name + '.o'], all_name)
 
         # This will fail! See explanation near the warning we check for, in the compiler source code
-        output = Popen(['python', EMCC, all_name], stderr=PIPE).communicate()
+        output = Popen(['python2', EMCC, all_name], stderr=PIPE).communicate()
         # Check for warning in the generated code
         generated = open(os.path.join(self.get_dir(), 'src.cpp.o.js')).read()
         assert 'Casting a function pointer type to another with a different number of arguments' in output[1], 'Missing expected warning'
@@ -5954,7 +5954,7 @@ int main(int argc, char **argv) {
         # emcc should build in dlmalloc automatically, and do all the sign correction etc. for it
 
         try_delete(os.path.join(self.get_dir(), 'src.cpp.o.js'))
-        output = Popen(['python', EMCC, path_from_root('tests', 'dlmalloc_test.c'), '-s', 'TOTAL_MEMORY=100000000',
+        output = Popen(['python2', EMCC, path_from_root('tests', 'dlmalloc_test.c'), '-s', 'TOTAL_MEMORY=100000000',
                         '-o', os.path.join(self.get_dir(), 'src.cpp.o.js')], stdout=PIPE, stderr=self.stderr_redirect).communicate()
 
         self.do_run('x', '*1,0*', ['200', '1'], no_build=True)
@@ -6580,7 +6580,7 @@ def process(filename):
 
     # Autodebug the code
     def do_autodebug(self, filename):
-      output = Popen(['python', AUTODEBUGGER, filename+'.o.ll', filename+'.o.ll.ll'], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
+      output = Popen(['python2', AUTODEBUGGER, filename+'.o.ll', filename+'.o.ll.ll'], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
       assert 'Success.' in output, output
       self.prep_ll_run(filename, filename+'.o.ll.ll', force_recompile=True) # rebuild .bc # TODO: use code in do_autodebug_post for this
 
@@ -6592,7 +6592,7 @@ def process(filename):
         return True
       print 'Autodebugging during post time'
       delattr(self, 'post')
-      output = Popen(['python', AUTODEBUGGER, filename+'.o.ll', filename+'.o.ll.ll'], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
+      output = Popen(['python2', AUTODEBUGGER, filename+'.o.ll', filename+'.o.ll.ll'], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
       assert 'Success.' in output, output
       shutil.copyfile(filename + '.o.ll.ll', filename + '.o.ll')
       Building.llvm_as(filename)
@@ -6773,8 +6773,8 @@ def process(filename):
         '''
         post = '''
 def process(filename):
-  Popen(['python', DEMANGLER, filename], stdout=open(filename + '.tmp', 'w')).communicate()
-  Popen(['python', NAMESPACER, filename, filename + '.tmp'], stdout=open(filename + '.tmp2', 'w')).communicate()
+  Popen(['python2', DEMANGLER, filename], stdout=open(filename + '.tmp', 'w')).communicate()
+  Popen(['python2', NAMESPACER, filename, filename + '.tmp'], stdout=open(filename + '.tmp2', 'w')).communicate()
   src = open(filename, 'r').read().replace(
     '// {{MODULE_ADDITIONS}',
     'Module["_"] = ' + open(filename + '.tmp2', 'r').read().replace('var ModuleNames = ', '').rstrip() + ';\n\n' + script_src + '\n\n' +
@@ -6829,7 +6829,7 @@ def process(filename):
         open(header_filename, 'w').write(header)
 
         basename = os.path.join(self.get_dir(), 'bindingtest')
-        output = Popen(['python', BINDINGS_GENERATOR, basename, header_filename], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
+        output = Popen(['python2', BINDINGS_GENERATOR, basename, header_filename], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
         #print output
         assert 'Traceback' not in output, 'Failure in binding generation: ' + output
 
@@ -7002,7 +7002,7 @@ Child2:9
         open(header_filename, 'w').write(header)
 
         basename = os.path.join(self.get_dir(), 'bindingtest')
-        output = Popen(['python', BINDINGS_GENERATOR, basename, header_filename], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
+        output = Popen(['python2', BINDINGS_GENERATOR, basename, header_filename], stdout=PIPE, stderr=self.stderr_redirect).communicate()[0]
         #print output
         assert 'Traceback' not in output, 'Failure in binding generation: ' + output
 
@@ -7677,7 +7677,7 @@ TT = %s
         suffix = '.c' if compiler == EMCC else '.cpp'
 
         # --version
-        output = Popen(['python', compiler, '--version'], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', compiler, '--version'], stdout=PIPE, stderr=PIPE).communicate()
         self.assertContained('''emcc (Emscripten GCC-like replacement) 2.0
 Copyright (C) 2012 the Emscripten authors.
 This is free and open source software under the MIT license.
@@ -7685,11 +7685,11 @@ There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR P
 ''', output[0].replace('\r', ''), output[1].replace('\r', ''))
 
         # -v, without input files
-        output = Popen(['python', compiler, '-v'], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', compiler, '-v'], stdout=PIPE, stderr=PIPE).communicate()
         self.assertContained('''clang version''', output[1].replace('\r', ''), output[1].replace('\r', ''))
 
         # --help
-        output = Popen(['python', compiler, '--help'], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', compiler, '--help'], stdout=PIPE, stderr=PIPE).communicate()
         self.assertContained('''%s [options] file...
 
 Most normal gcc/g++ options will work, for example:
@@ -7702,7 +7702,7 @@ Options that are modified or new in %s include:
 
         # emcc src.cpp ==> writes a.out.js
         self.clear()
-        output = Popen(['python', compiler, path_from_root('tests', 'hello_world' + suffix)], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', compiler, path_from_root('tests', 'hello_world' + suffix)], stdout=PIPE, stderr=PIPE).communicate()
         assert len(output[0]) == 0, output[0]
         assert os.path.exists('a.out.js'), '\n'.join(output)
         self.assertContained('hello, world!', run_js('a.out.js'))
@@ -7710,7 +7710,7 @@ Options that are modified or new in %s include:
         # properly report source code errors, and stop there
         self.clear()
         assert not os.path.exists('a.out.js')
-        process = Popen(['python', compiler, path_from_root('tests', 'hello_world_error' + suffix)], stdout=PIPE, stderr=PIPE)
+        process = Popen(['python2', compiler, path_from_root('tests', 'hello_world_error' + suffix)], stdout=PIPE, stderr=PIPE)
         output = process.communicate()
         assert not os.path.exists('a.out.js'), 'compilation failed, so no output file is expected'
         assert len(output[0]) == 0, output[0]
@@ -7727,29 +7727,29 @@ Options that are modified or new in %s include:
         for args in [['-c'], ['-o', 'src.o'], ['-o', 'src.bc'], ['-o', 'src.so'], ['-o', 'js']]:
           target = args[1] if len(args) == 2 else 'hello_world.o'
           self.clear()
-          Popen(['python', compiler, path_from_root('tests', 'hello_world' + suffix)] + args, stdout=PIPE, stderr=PIPE).communicate()
+          Popen(['python2', compiler, path_from_root('tests', 'hello_world' + suffix)] + args, stdout=PIPE, stderr=PIPE).communicate()
           syms = Building.llvm_nm(target)
           assert len(syms.defs) == 1 and 'main' in syms.defs, 'Failed to generate valid bitcode'
           if target == 'js': # make sure emcc can recognize the target as a bitcode file
             shutil.move(target, target + '.bc')
             target += '.bc'
-          output = Popen(['python', compiler, target, '-o', target + '.js'], stdout = PIPE, stderr = PIPE).communicate()
+          output = Popen(['python2', compiler, target, '-o', target + '.js'], stdout = PIPE, stderr = PIPE).communicate()
           assert len(output[0]) == 0, output[0]
           assert os.path.exists(target + '.js'), 'Expected %s to exist since args are %s : %s' % (target + '.js', str(args), '\n'.join(output))
           self.assertContained('hello, world!', run_js(target + '.js'))
 
         # handle singleton archives
         self.clear()
-        Popen(['python', compiler, path_from_root('tests', 'hello_world' + suffix), '-o', 'a.bc'], stdout=PIPE, stderr=PIPE).communicate()
+        Popen(['python2', compiler, path_from_root('tests', 'hello_world' + suffix), '-o', 'a.bc'], stdout=PIPE, stderr=PIPE).communicate()
         Popen([LLVM_AR, 'r', 'a.a', 'a.bc'], stdout=PIPE, stderr=PIPE).communicate()
         assert os.path.exists('a.a')
-        output = Popen(['python', compiler, 'a.a']).communicate()
+        output = Popen(['python2', compiler, 'a.a']).communicate()
         assert os.path.exists('a.out.js'), output
         self.assertContained('hello, world!', run_js('a.out.js'))
 
         # emcc src.ll ==> generates .js
         self.clear()
-        output = Popen(['python', compiler, path_from_root('tests', 'hello_world.ll')], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', compiler, path_from_root('tests', 'hello_world.ll')], stdout=PIPE, stderr=PIPE).communicate()
         assert len(output[0]) == 0, output[0]
         assert os.path.exists('a.out.js'), '\n'.join(output)
         self.assertContained('hello, world!', run_js('a.out.js'))
@@ -7761,7 +7761,7 @@ Options that are modified or new in %s include:
           os.mkdir('b_dir')
           for path in [os.path.abspath(os.path.join('..', 'file1.js')), os.path.join('b_dir', 'file2.js')]:
             self.clear(in_curr=True)
-            output = Popen(['python', compiler, path_from_root('tests', 'hello_world.ll'), '-o', path], stdout=PIPE, stderr=PIPE).communicate()
+            output = Popen(['python2', compiler, path_from_root('tests', 'hello_world.ll'), '-o', path], stdout=PIPE, stderr=PIPE).communicate()
             assert os.path.exists(path), path + ' does not exist; ' + '\n'.join(output)
             self.assertContained('hello, world!', run_js(path))
         finally:
@@ -7775,7 +7775,7 @@ Options that are modified or new in %s include:
         # very speed-sensitive. So we do not implement it in JS in library.js, instead we compile it from source
         for source, has_malloc in [('hello_world' + suffix, False), ('hello_malloc.cpp', True)]:
           self.clear()
-          output = Popen(['python', compiler, path_from_root('tests', source)], stdout=PIPE, stderr=PIPE).communicate()
+          output = Popen(['python2', compiler, path_from_root('tests', source)], stdout=PIPE, stderr=PIPE).communicate()
           assert os.path.exists('a.out.js'), '\n'.join(output)
           self.assertContained('hello, world!', run_js('a.out.js'))
           generated = open('a.out.js').read()
@@ -7801,14 +7801,14 @@ Options that are modified or new in %s include:
         ]:
           #print params, opt_level, bc_params, closure
           self.clear()
-          output = Popen(['python', compiler, path_from_root('tests', 'hello_world_loop' + ('_malloc' if has_malloc else '') + '.cpp')] + params,
+          output = Popen(['python2', compiler, path_from_root('tests', 'hello_world_loop' + ('_malloc' if has_malloc else '') + '.cpp')] + params,
                          stdout=PIPE, stderr=PIPE).communicate()
           assert len(output[0]) == 0, output[0]
           if bc_params is not None:
             if '-O1' in params and 'something.bc' in params:
               assert 'warning: -Ox flags ignored, since not generating JavaScript' in output[1]
             assert os.path.exists('something.bc'), output[1]
-            output = Popen(['python', compiler, 'something.bc', '-o', 'something.js'] + bc_params, stdout=PIPE, stderr=PIPE).communicate()
+            output = Popen(['python2', compiler, 'something.bc', '-o', 'something.js'] + bc_params, stdout=PIPE, stderr=PIPE).communicate()
           assert os.path.exists('something.js'), output[1]
           assert ('Warning: Applying some potentially unsafe optimizations!' in output[1]) == (opt_level >= 3), 'unsafe warning should appear in opt >= 3'
           self.assertContained('hello, world!', run_js('something.js'))
@@ -7849,7 +7849,7 @@ Options that are modified or new in %s include:
           (['--llvm-opts', '1'], lambda generated: '_puts(' in generated, 'llvm opts requested'),
         ]:
           self.clear()
-          output = Popen(['python', compiler, path_from_root('tests', 'hello_world_loop.cpp'), '-o', 'a.out.js'] + params, stdout=PIPE, stderr=PIPE).communicate()
+          output = Popen(['python2', compiler, path_from_root('tests', 'hello_world_loop.cpp'), '-o', 'a.out.js'] + params, stdout=PIPE, stderr=PIPE).communicate()
           assert len(output[0]) == 0, output[0]
           assert os.path.exists('a.out.js'), '\n'.join(output)
           self.assertContained('hello, world!', run_js('a.out.js'))
@@ -7858,7 +7858,7 @@ Options that are modified or new in %s include:
         # Compiling two source files into a final JS.
         for args, target in [([], 'a.out.js'), (['-o', 'combined.js'], 'combined.js')]:
           self.clear()
-          output = Popen(['python', compiler, path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp')] + args,
+          output = Popen(['python2', compiler, path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp')] + args,
                          stdout=PIPE, stderr=PIPE).communicate()
           assert len(output[0]) == 0, output[0]
           assert os.path.exists(target), '\n'.join(output)
@@ -7866,7 +7866,7 @@ Options that are modified or new in %s include:
 
           # Compiling two files with -c will generate separate .bc files
           self.clear()
-          output = Popen(['python', compiler, path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp'), '-c'] + args,
+          output = Popen(['python2', compiler, path_from_root('tests', 'twopart_main.cpp'), path_from_root('tests', 'twopart_side.cpp'), '-c'] + args,
                          stdout=PIPE, stderr=PIPE).communicate()
           if '-o' in args:
             # specifying -o and -c is an error
@@ -7878,24 +7878,24 @@ Options that are modified or new in %s include:
           assert not os.path.exists(target), 'We should only have created bitcode here: ' + '\n'.join(output)
 
           # Compiling one of them alone is expected to fail
-          output = Popen(['python', compiler, 'twopart_main.o'] + args, stdout=PIPE, stderr=PIPE).communicate()
+          output = Popen(['python2', compiler, 'twopart_main.o'] + args, stdout=PIPE, stderr=PIPE).communicate()
           assert os.path.exists(target), '\n'.join(output)
           #print '\n'.join(output)
           self.assertContained('is not a function', run_js(target, stderr=STDOUT))
           try_delete(target)
 
           # Combining those bc files into js should work
-          output = Popen(['python', compiler, 'twopart_main.o', 'twopart_side.o'] + args, stdout=PIPE, stderr=PIPE).communicate()
+          output = Popen(['python2', compiler, 'twopart_main.o', 'twopart_side.o'] + args, stdout=PIPE, stderr=PIPE).communicate()
           assert os.path.exists(target), '\n'.join(output)
           self.assertContained('side got: hello from main, over', run_js(target))
 
           # Combining bc files into another bc should also work
           try_delete(target)
           assert not os.path.exists(target)
-          output = Popen(['python', compiler, 'twopart_main.o', 'twopart_side.o', '-o', 'combined.bc'] + args, stdout=PIPE, stderr=PIPE).communicate()
+          output = Popen(['python2', compiler, 'twopart_main.o', 'twopart_side.o', '-o', 'combined.bc'] + args, stdout=PIPE, stderr=PIPE).communicate()
           syms = Building.llvm_nm('combined.bc')
           assert len(syms.defs) == 2 and 'main' in syms.defs, 'Failed to generate valid bitcode'
-          output = Popen(['python', compiler, 'combined.bc', '-o', 'combined.bc.js'], stdout = PIPE, stderr = PIPE).communicate()
+          output = Popen(['python2', compiler, 'combined.bc', '-o', 'combined.bc.js'], stdout = PIPE, stderr = PIPE).communicate()
           assert len(output[0]) == 0, output[0]
           assert os.path.exists('combined.bc.js'), 'Expected %s to exist' % ('combined.bc.js')
           self.assertContained('side got: hello from main, over', run_js('combined.bc.js'))
@@ -7911,7 +7911,7 @@ f.write('transformed!')
 f.close()
 ''')
         trans_file.close()
-        output = Popen(['python', compiler, path_from_root('tests', 'hello_world' + suffix), '--js-transform', 'python t.py'], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', compiler, path_from_root('tests', 'hello_world' + suffix), '--js-transform', 'python t.py'], stdout=PIPE, stderr=PIPE).communicate()
         assert open('a.out.js').read() == 'transformed!', 'Transformed output must be as expected'
 
       # TODO: Add in files test a clear example of using disablePermissions, and link to it from the wiki
@@ -7977,14 +7977,14 @@ f.close()
     def test_failure_error_code(self):
       for compiler in [EMCC, EMXX]:
         # Test that if one file is missing from the build, then emcc shouldn't succeed, and shouldn't try to produce an output file.
-        process = Popen(['python', compiler, path_from_root('tests', 'hello_world.c'), 'this_file_is_missing.c', '-o', 'this_output_file_should_never_exist.js'], stdout=PIPE, stderr=PIPE)
+        process = Popen(['python2', compiler, path_from_root('tests', 'hello_world.c'), 'this_file_is_missing.c', '-o', 'this_output_file_should_never_exist.js'], stdout=PIPE, stderr=PIPE)
         process.communicate()
         assert process.returncode is not 0, 'Trying to compile a nonexisting file should return with a nonzero error code!'
         assert os.path.exists('this_output_file_should_never_exist.js') == False, 'Emcc should not produce an output file when build fails!'
 
     def test_Os(self):
       for opt in ['s', '0']:
-        output = Popen(['python', EMCC, path_from_root('tests', 'hello_world.c'), '-O' + opt], stdout=PIPE, stderr=PIPE).communicate()
+        output = Popen(['python2', EMCC, path_from_root('tests', 'hello_world.c'), '-O' + opt], stdout=PIPE, stderr=PIPE).communicate()
         assert len(output[0]) == 0, output[0]
         assert ('emcc: warning: -Os is ignored (use -O0, -O1, -O2)' in output[1]) == (opt == 's'), 'warn on -Os when necessary'
         assert os.path.exists('a.out.js'), '\n'.join(output)
@@ -8007,7 +8007,7 @@ f.close()
           return 0;
         }
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'test.cpp'), '-fcatch-undefined-behavior']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'test.cpp'), '-fcatch-undefined-behavior']).communicate()
       self.assertContained('hello, world!', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_unaligned_memory(self):
@@ -8027,7 +8027,7 @@ f.close()
           printf("data[1,2] 16bit: %x\n", *(Bit16u*)(data+1));
         }
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'test.cpp'), '-s', 'UNALIGNED_MEMORY=1']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'test.cpp'), '-s', 'UNALIGNED_MEMORY=1']).communicate()
       self.assertContained('data: 67452301\ndata[0,1] 16bit: 2301\ndata[1,2] 16bit: 4523', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_unaligned_memory_2(self):
@@ -8043,7 +8043,7 @@ f.close()
             return 0;
         }
         ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'test.cpp'), '-s', 'UNALIGNED_MEMORY=1']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'test.cpp'), '-s', 'UNALIGNED_MEMORY=1']).communicate()
       self.assertContained('testString = Hello, World!', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_l_link(self):
@@ -8069,9 +8069,9 @@ f.close()
         }
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'libdir', 'libfile.cpp'), '-c']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'libdir', 'libfile.cpp'), '-c']).communicate()
       shutil.move(os.path.join(self.get_dir(), 'libfile.o'), os.path.join(self.get_dir(), 'libdir', 'libfile.so'))
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '-L' + os.path.join(self.get_dir(), 'libdir'), '-lfile']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '-L' + os.path.join(self.get_dir(), 'libdir'), '-lfile']).communicate()
       self.assertContained('hello from lib', run_js(os.path.join(self.get_dir(), 'a.out.js')))
       assert not os.path.exists('a.out') and not os.path.exists('a.exe'), 'Must not leave unneeded linker stubs'
 
@@ -8170,7 +8170,7 @@ f.close()
                              (['-Isubdir/something'], False),
                              (['-Lsubdir/something'], False),
                              ([], False)]:
-        err = Popen(['python', EMCC, 'main.c'] + args, stderr=PIPE).communicate()[1]
+        err = Popen(['python2', EMCC, 'main.c'] + args, stderr=PIPE).communicate()[1]
         assert ('emcc: warning: -I or -L of an absolute path encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript)' in err) == expected, err
 
     def test_local_link(self):
@@ -8198,8 +8198,8 @@ f.close()
         }
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'libfile.cpp'), '-o', 'libfile.so']).communicate()
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), os.path.join(self.get_dir(), 'subdir', 'libfile.so'), '-L.'], stderr=PIPE).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'libfile.cpp'), '-o', 'libfile.so']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), os.path.join(self.get_dir(), 'subdir', 'libfile.so'), '-L.'], stderr=PIPE).communicate()
       self.assertContained('hello from lib', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_runtimelink_multi(self):
@@ -8260,11 +8260,11 @@ f.close()
         }
       ''')
 
-      Popen(['python', EMCC, 'testa.cpp', '-o', 'liba.js', '-s', 'BUILD_AS_SHARED_LIB=2', '-s', 'LINKABLE=1', '-I.']).communicate()
-      Popen(['python', EMCC, 'testb.cpp', '-o', 'libb.js', '-s', 'BUILD_AS_SHARED_LIB=2', '-s', 'LINKABLE=1', '-I.']).communicate()
-      Popen(['python', EMCC, 'main.cpp', '-o', 'main.js', '-s', 'RUNTIME_LINKED_LIBS=["liba.js", "libb.js"]', '-I.']).communicate()
+      Popen(['python2', EMCC, 'testa.cpp', '-o', 'liba.js', '-s', 'BUILD_AS_SHARED_LIB=2', '-s', 'LINKABLE=1', '-I.']).communicate()
+      Popen(['python2', EMCC, 'testb.cpp', '-o', 'libb.js', '-s', 'BUILD_AS_SHARED_LIB=2', '-s', 'LINKABLE=1', '-I.']).communicate()
+      Popen(['python2', EMCC, 'main.cpp', '-o', 'main.js', '-s', 'RUNTIME_LINKED_LIBS=["liba.js", "libb.js"]', '-I.']).communicate()
 
-      Popen(['python', EMCC, 'main.cpp', 'testa.cpp', 'testb.cpp', '-o', 'full.js', '-I.']).communicate()
+      Popen(['python2', EMCC, 'main.cpp', 'testa.cpp', 'testb.cpp', '-o', 'full.js', '-I.']).communicate()
 
       self.assertContained('TestA\nTestB\nTestA\n', run_js('main.js', engine=SPIDERMONKEY_ENGINE))
 
@@ -8296,7 +8296,7 @@ f.close()
         });
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--js-library', os.path.join(self.get_dir(), 'mylib1.js'),
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--js-library', os.path.join(self.get_dir(), 'mylib1.js'),
                                                                        '--js-library', os.path.join(self.get_dir(), 'mylib2.js')]).communicate()
       self.assertContained('hello from lib!\n*32*\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
@@ -8323,16 +8323,40 @@ f.close()
         void printey() { printf("hello there\\n"); }
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'foo', 'main.cpp'), os.path.join(self.get_dir(), 'bar', 'main.cpp')]).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'foo', 'main.cpp'), os.path.join(self.get_dir(), 'bar', 'main.cpp')]).communicate()
       self.assertContained('hello there', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
       # ditto with first creating .o files
       try_delete(os.path.join(self.get_dir(), 'a.out.js'))
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'foo', 'main.cpp'), '-o', os.path.join(self.get_dir(), 'foo', 'main.o')]).communicate()
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'bar', 'main.cpp'), '-o', os.path.join(self.get_dir(), 'bar', 'main.o')]).communicate()
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'foo', 'main.o'), os.path.join(self.get_dir(), 'bar', 'main.o')]).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'foo', 'main.cpp'), '-o', os.path.join(self.get_dir(), 'foo', 'main.o')]).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'bar', 'main.cpp'), '-o', os.path.join(self.get_dir(), 'bar', 'main.o')]).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'foo', 'main.o'), os.path.join(self.get_dir(), 'bar', 'main.o')]).communicate()
       self.assertContained('hello there', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
+    def test_remove_duplicates(self):
+      # can happen with .a files. we do a best-effort, removing dupes
+      open(os.path.join(self.get_dir(), 'main.cpp'), 'w').write('''
+        #include<stdio.h>
+        void printey() { printf("bye bye\\n"); }
+        int main() {
+          printey();
+          return 0;
+        }
+      ''')
+      open(os.path.join(self.get_dir(), 'side.cpp'), 'w').write('''
+        #include<stdio.h>
+        void printey() { printf("bye bye\\n"); }
+      ''')
+
+      # without --remove-duplicates, we fail
+      err = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), os.path.join(self.get_dir(), 'side.cpp')], stderr=PIPE).communicate()[1]
+      assert not os.path.exists('a.out.js')
+      assert 'multiply' in err
+
+      # with it, we succeed
+      err = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), os.path.join(self.get_dir(), 'side.cpp'), '--remove-duplicates'], stderr=PIPE).communicate()[1]
+      self.assertContained('bye bye', run_js(os.path.join(self.get_dir(), 'a.out.js')))
+
     def test_main_a(self):
       # if main() is in a .a, we need to pull in that .a
 
@@ -8352,12 +8376,12 @@ f.close()
         int f() { return 12346; }
       ''')
 
-      Popen(['python', EMCC, main_name, '-c', '-o', main_name+'.bc']).communicate()
-      Popen(['python', EMCC, other_name, '-c', '-o', other_name+'.bc']).communicate()
+      Popen(['python2', EMCC, main_name, '-c', '-o', main_name+'.bc']).communicate()
+      Popen(['python2', EMCC, other_name, '-c', '-o', other_name+'.bc']).communicate()
 
-      Popen(['python', EMAR, 'cr', main_name+'.a', main_name+'.bc']).communicate()
+      Popen(['python2', EMAR, 'cr', main_name+'.a', main_name+'.bc']).communicate()
 
-      Popen(['python', EMCC, other_name+'.bc', main_name+'.a']).communicate()
+      Popen(['python2', EMCC, other_name+'.bc', main_name+'.a']).communicate()
 
       self.assertContained('result: 12346.', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
@@ -8368,8 +8392,8 @@ f.close()
           printf("a\n");
         }
       ''')
-      Popen(['python', EMCC, 'common.c', '-c', '-o', 'common.o']).communicate()
-      Popen(['python', EMAR, 'rc', 'liba.a', 'common.o']).communicate()
+      Popen(['python2', EMCC, 'common.c', '-c', '-o', 'common.o']).communicate()
+      Popen(['python2', EMAR, 'rc', 'liba.a', 'common.o']).communicate()
 
       open('common.c', 'w').write(r'''
         #include <stdio.h>
@@ -8377,8 +8401,8 @@ f.close()
           printf("b\n");
         }
       ''')
-      Popen(['python', EMCC, 'common.c', '-c', '-o', 'common.o']).communicate()
-      Popen(['python', EMAR, 'rc', 'libb.a', 'common.o']).communicate()
+      Popen(['python2', EMCC, 'common.c', '-c', '-o', 'common.o']).communicate()
+      Popen(['python2', EMAR, 'rc', 'libb.a', 'common.o']).communicate()
 
       open('main.c', 'w').write(r'''
         void a(void);
@@ -8388,7 +8412,7 @@ f.close()
           b();
         }
       ''')
-      Popen(['python', EMCC, 'main.c', '-L.', '-la', '-lb']).communicate()
+      Popen(['python2', EMCC, 'main.c', '-L.', '-la', '-lb']).communicate()
 
       self.assertContained('a\nb\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
@@ -8407,11 +8431,11 @@ f.close()
         }
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--embed-file', 'somefile.txt']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--embed-file', 'somefile.txt']).communicate()
       self.assertContained('|hello from a file wi|', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
       # preload twice, should not err
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--embed-file', 'somefile.txt', '--embed-file', 'somefile.txt']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--embed-file', 'somefile.txt', '--embed-file', 'somefile.txt']).communicate()
       self.assertContained('|hello from a file wi|', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_embed_file_dup(self):
@@ -8443,7 +8467,7 @@ f.close()
         }
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--embed-file', 'tst']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--embed-file', 'tst']).communicate()
       self.assertContained('|frist|\n|sacond|\n|thard|\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_multidynamic_link(self):
@@ -8488,7 +8512,7 @@ f.close()
       ''')
 
       # This lets us link the same dynamic lib twice. We will need to link it in manually at the end.
-      compiler = ['python', EMCC, '--ignore-dynamic-linking']
+      compiler = ['python2', EMCC, '--ignore-dynamic-linking']
 
       # Build libfile normally into an .so
       Popen(compiler + [os.path.join(self.get_dir(), 'libdir', 'libfile.cpp'), '-o', os.path.join(self.get_dir(), 'libdir', 'libfile.so')]).communicate()
@@ -8498,7 +8522,7 @@ f.close()
       Popen(compiler + [os.path.join(self.get_dir(), 'main.cpp'), '-L' + os.path.join(self.get_dir(), 'libdir'), '-lfile', '-lother', '-c']).communicate()
 
       # The normal build system is over. We need to do an additional step to link in the dynamic libraries, since we ignored them before
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.o'), '-L' + os.path.join(self.get_dir(), 'libdir'), '-lfile', '-lother']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.o'), '-L' + os.path.join(self.get_dir(), 'libdir'), '-lfile', '-lother']).communicate()
 
       self.assertContained('*hello from lib\n|hello from lib|\n*', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
@@ -8518,7 +8542,7 @@ f.close()
         Module.print(MESSAGE);
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'before.js', '--post-js', 'after.js']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'before.js', '--post-js', 'after.js']).communicate()
       self.assertContained('hello from main\nhello from js\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_sdl_endianness(self):
@@ -8531,7 +8555,7 @@ f.close()
           return 0;
         }
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp')]).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp')]).communicate()
       self.assertContained('1234, 1234, 4321\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_warn_undefined(self):
@@ -8547,10 +8571,10 @@ f.close()
           return 0;
         }
       ''')
-      output = Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '-s', 'WARN_ON_UNDEFINED_SYMBOLS=1'], stderr=PIPE).communicate()
+      output = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '-s', 'WARN_ON_UNDEFINED_SYMBOLS=1'], stderr=PIPE).communicate()
       self.assertContained('Unresolved symbol: _something', output[1])
 
-      output = Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp')], stderr=PIPE).communicate()
+      output = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp')], stderr=PIPE).communicate()
       self.assertNotContained('Unresolved symbol: _something\n', output[1])
 
     def test_toobig(self):
@@ -8576,7 +8600,7 @@ f.close()
           return 0;
         }
       ''')
-      output = Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp')], stderr=PIPE).communicate()[1]
+      output = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp')], stderr=PIPE).communicate()[1]
       assert 'Emscripten failed' in output, output
       assert 'warning: very large fixed-size structural type' in output, output
 
@@ -8595,7 +8619,7 @@ f.close()
         };
       ''')
 
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js']).communicate()
       self.assertContained('pre-run\nhello from main\npost-run\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
       # never run, so no preRun or postRun
@@ -8605,7 +8629,7 @@ f.close()
 
       # noInitialRun prevents run
       for no_initial_run in [0, 1]:
-        Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp')]).communicate()
+        Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp')]).communicate()
         src = 'var Module = { noInitialRun: %d };\n' % no_initial_run + open(os.path.join(self.get_dir(), 'a.out.js')).read()
         open(os.path.join(self.get_dir(), 'a.out.js'), 'w').write(src)
         assert ('hello from main' in run_js(os.path.join(self.get_dir(), 'a.out.js'))) != no_initial_run, 'only run if no noInitialRun'
@@ -8624,7 +8648,7 @@ f.close()
           preInit: function() { Module.print('pre-init') }
         };
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js']).communicate()
       self.assertContained('pre-init\npre-run\nhello from main\npost-run\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_prepost2(self):
@@ -8643,7 +8667,7 @@ f.close()
       open(os.path.join(self.get_dir(), 'pre2.js'), 'w').write('''
         Module.postRun = function() { Module.print('post-run') };
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js', '--pre-js', 'pre2.js']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js', '--pre-js', 'pre2.js']).communicate()
       self.assertContained('pre-run\nhello from main\npost-run\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_prepre(self):
@@ -8662,13 +8686,13 @@ f.close()
       open(os.path.join(self.get_dir(), 'pre2.js'), 'w').write('''
         Module.preRun.push(function() { Module.print('prepre') });
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js', '--pre-js', 'pre2.js']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '--pre-js', 'pre.js', '--pre-js', 'pre2.js']).communicate()
       self.assertContained('prepre\npre-run\nhello from main\n', run_js(os.path.join(self.get_dir(), 'a.out.js')))
 
     def test_fix_closure(self):
       input = path_from_root('tests', 'test-fix-closure.js')
       expected = path_from_root('tests', 'test-fix-closure.out.js')
-      Popen(['python', path_from_root('tools', 'fix_closure.py'), input, 'out.js']).communicate(input)
+      Popen(['python2', path_from_root('tools', 'fix_closure.py'), input, 'out.js']).communicate(input)
       output = open('out.js').read()
       assert '0,zzz_Q_39fa,0' in output
       assert 'function(a,c)' not in output # should be uninlined, so it gets a name
@@ -8698,7 +8722,7 @@ f.close()
     def test_m_mm(self):
       open(os.path.join(self.get_dir(), 'foo.c'), 'w').write('''#include <emscripten.h>''')
       for opt in ['M', 'MM']:
-        output, err = Popen(['python', EMCC, os.path.join(self.get_dir(), 'foo.c'), '-' + opt], stdout=PIPE, stderr=PIPE).communicate()
+        output, err = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'foo.c'), '-' + opt], stdout=PIPE, stderr=PIPE).communicate()
         assert 'foo.o: ' in output, '-%s failed to produce the right output: %s' % (opt, output)
         assert 'error' not in err, 'Unexpected stderr: ' + err
 
@@ -8707,7 +8731,7 @@ f.close()
       if multiprocessing.cpu_count() < 2: return self.skip('need multiple cores')
       try:
         os.environ['EMCC_DEBUG'] = '1'
-        output, err = Popen(['python', EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-O1'], stdout=PIPE, stderr=PIPE).communicate()
+        output, err = Popen(['python2', EMCC, path_from_root('tests', 'hello_libcxx.cpp'), '-O1'], stdout=PIPE, stderr=PIPE).communicate()
         assert 'phase 2 working on 3 chunks' in err, err
         assert 'splitting up js optimization into 2 chunks' in err, err
       finally:
@@ -8731,7 +8755,7 @@ f.close()
       ]:
         print args, fail
         try_delete(self.in_dir('a.out.js'))
-        Popen(['python', EMCC, path_from_root('tests', 'embind', 'embind_test.cpp'), '--post-js', path_from_root('tests', 'embind', 'embind_test.js')] + args, stderr=PIPE if fail else None).communicate()
+        Popen(['python2', EMCC, path_from_root('tests', 'embind', 'embind_test.cpp'), '--post-js', path_from_root('tests', 'embind', 'embind_test.js')] + args, stderr=PIPE if fail else None).communicate()
         assert os.path.exists(self.in_dir('a.out.js')) == (not fail)
         if not fail:
           output = run_js(self.in_dir('a.out.js'))
@@ -8795,8 +8819,8 @@ fixture: interfaces
       open(os.path.join(self.get_dir(), 'somefile.binary'), 'w').write('''waka waka############################''')
       open(os.path.join(self.get_dir(), 'test.file'), 'w').write('''ay file..............,,,,,,,,,,,,,,''')
       open(os.path.join(self.get_dir(), 'stdin'), 'w').write('''inter-active''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'files.cpp'), '-c']).communicate()
-      Popen(['python', path_from_root('tools', 'nativize_llvm.py'), os.path.join(self.get_dir(), 'files.o')]).communicate(input)[0]
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'files.cpp'), '-c']).communicate()
+      Popen(['python2', path_from_root('tools', 'nativize_llvm.py'), os.path.join(self.get_dir(), 'files.o')]).communicate(input)[0]
       output = Popen([os.path.join(self.get_dir(), 'files.o.run')], stdin=open(os.path.join(self.get_dir(), 'stdin')), stdout=PIPE, stderr=PIPE).communicate()
       self.assertIdentical('''size: 37
 data: 119,97,107,97,32,119,97,107,97,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35,35
@@ -8814,7 +8838,7 @@ fscanfed: 10 - hello
       self.assertIdentical('texte\n', output[1])
 
     def test_emconfig(self):
-      output = Popen(['python', EMCONFIG, 'LLVM_ROOT'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
+      output = Popen(['python2', EMCONFIG, 'LLVM_ROOT'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
       try:
         assert output == LLVM_ROOT
       except:
@@ -8822,16 +8846,16 @@ fscanfed: 10 - hello
         raise
       invalid = 'Usage: em-config VAR_NAME'
       # Don't accept variables that do not exist
-      output = Popen(['python', EMCONFIG, 'VAR_WHICH_DOES_NOT_EXIST'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
+      output = Popen(['python2', EMCONFIG, 'VAR_WHICH_DOES_NOT_EXIST'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
       assert output == invalid
       # Don't accept no arguments
-      output = Popen(['python', EMCONFIG], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
+      output = Popen(['python2', EMCONFIG], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
       assert output == invalid
       # Don't accept more than one variable
-      output = Popen(['python', EMCONFIG, 'LLVM_ROOT', 'EMCC'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
+      output = Popen(['python2', EMCONFIG, 'LLVM_ROOT', 'EMCC'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
       assert output == invalid
       # Don't accept arbitrary python code
-      output = Popen(['python', EMCONFIG, 'sys.argv[1]'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
+      output = Popen(['python2', EMCONFIG, 'sys.argv[1]'], stdout=PIPE, stderr=PIPE).communicate()[0].strip()
       assert output == invalid
 
     def test_link_s(self):
@@ -8855,10 +8879,10 @@ fscanfed: 10 - hello
           }
         }
       ''')
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '-o', 'main.o']).communicate()
-      Popen(['python', EMCC, os.path.join(self.get_dir(), 'supp.cpp'), '-o', 'supp.o']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.cpp'), '-o', 'main.o']).communicate()
+      Popen(['python2', EMCC, os.path.join(self.get_dir(), 'supp.cpp'), '-o', 'supp.o']).communicate()
 
-      output = Popen(['python', EMCC, os.path.join(self.get_dir(), 'main.o'), '-s', os.path.join(self.get_dir(), 'supp.o'), '-s', 'SAFE_HEAP=1'], stderr=PIPE).communicate()
+      output = Popen(['python2', EMCC, os.path.join(self.get_dir(), 'main.o'), '-s', os.path.join(self.get_dir(), 'supp.o'), '-s', 'SAFE_HEAP=1'], stderr=PIPE).communicate()
       self.assertContained('emcc: warning: treating -s as linker option', output[1])
       output = run_js('a.out.js')
       assert 'yello' in output, 'code works'
@@ -8872,7 +8896,7 @@ fscanfed: 10 - hello
         }
       ''')
       os.environ["EMMAKEN_JUST_CONFIGURE"] = "1"
-      cmd = ['python', EMCC, '-s', 'ASSERTIONS=1', os.path.join(self.get_dir(), 'conftest.c'), '-o', 'conftest']
+      cmd = ['python2', EMCC, '-s', 'ASSERTIONS=1', os.path.join(self.get_dir(), 'conftest.c'), '-o', 'conftest']
       output = Popen(cmd, stderr=PIPE).communicate()
       del os.environ["EMMAKEN_JUST_CONFIGURE"]
       self.assertNotContained('emcc: warning: treating -s as linker option', output[1])
@@ -8882,26 +8906,26 @@ fscanfed: 10 - hello
       # crunch should not be run if a .crn exists that is more recent than the .dds
       shutil.copyfile(path_from_root('tests', 'ship.dds'), 'ship.dds')
       time.sleep(0.1)
-      Popen(['python', FILE_PACKAGER, 'test.data', '--pre-run', '--crunch=32', '--preload', 'ship.dds'], stdout=open('pre.js', 'w')).communicate()
+      Popen(['python2', FILE_PACKAGER, 'test.data', '--pre-run', '--crunch=32', '--preload', 'ship.dds'], stdout=open('pre.js', 'w')).communicate()
       assert os.stat('test.data').st_size < 0.25*os.stat('ship.dds').st_size, 'Compressed should be much smaller than dds'
       crunch_time = os.stat('ship.crn').st_mtime
       dds_time = os.stat('ship.dds').st_