tests: Sketch a lit config for running libc++ tests; currently expects libc++ to have been installed.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@113925 91177308-0d34-0410-b5e6-96231b3b80d8

test/lit.cfg

@@ -0,0 +1,122 @@
+# -*- Python -*-
+
+# Configuration file for the 'lit' test runner.
+
+import os
+import platform
+import tempfile
+import signal
+import subprocess
+
+class LibcxxTestFormat(lit.formats.FileBasedTest):
+    """
+    Custom test format handler for use with the test format use by libc++.
+
+    Tests fall into two categories:
+      FOO.pass.cpp - Executable test which should compile, run, and exit with
+                     code 0.
+      FOO.fail.cpp - Negative test case which is expected to fail compilation.
+    """
+
+    def __init__(self, cxx_under_test, options): self.cxx_under_test =
+    cxx_under_test self.options = list(options)
+
+    def execute_command(self, command):
+        p = subprocess.Popen(command, stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        out,err = p.communicate()
+        exitCode = p.wait()
+
+        # Detect Ctrl-C in subprocess.
+        if exitCode == -signal.SIGINT:
+            raise KeyboardInterrupt
+
+        return out, err, exitCode
+
+    def execute(self, test, lit_config):
+        name = test.path_in_suite[-1]
+        source_path = test.getSourcePath()
+
+        # Check what kind of test this is.
+        assert name.endswith('.pass.cpp') or name.endswith('.fail.cpp')
+        expected_compile_fail = name.endswith('.fail.cpp')
+
+        # If this is a compile (failure) test, build it and check for failure.
+        if expected_compile_fail:
+            cmd = [self.cxx_under_test, '-c',
+                   '-o', '/dev/null', source_path] + self.options
+            out, err, exitCode = self.execute_command(cmd)
+            if exitCode == 1:
+                return lit.Test.PASS, ""
+            else:
+                report = """Command: %s\n""" % ' '.join(["'%s'" % a
+                                                         for a in cmd])
+                report += """Exit Code: %d\n""" % exitCode
+                if out:
+                    report += """Standard Output:\n--\n%s--""" % out
+                if err:
+                    report += """Standard Error:\n--\n%s--""" % err
+                report += "\n\nExpected compilation to fail!"
+                return Test.FAIL, report
+        else:
+            exec_file = tempfile.NamedTemporaryFile(suffix="exe", delete=False)
+            exec_path = exec_file.name
+            exec_file.close()
+
+            try:
+                cmd = [self.cxx_under_test, '-o', exec_path,
+                       source_path] + self.options
+                out, err, exitCode = self.execute_command(cmd)
+                if exitCode != 0:
+                    exec_file.close()
+                    report = """Command: %s\n""" % ' '.join(["'%s'" % a
+                                                             for a in cmd])
+                    report += """Exit Code: %d\n""" % exitCode
+                    if out:
+                        report += """Standard Output:\n--\n%s--""" % out
+                    if err:
+                        report += """Standard Error:\n--\n%s--""" % err
+                    report += "\n\nCompilation failed unexpectedly!"
+                    return lit.Test.FAIL, report
+
+                cmd = [exec_path]
+                out, err, exitCode = self.execute_command(cmd)
+                if exitCode != 0:
+                    exec_path.close()
+                    report = """Command: %s\n""" % ' '.join(["'%s'" % a
+                                                             for a in cmd])
+                    report += """Exit Code: %d\n""" % exitCode
+                    if out:
+                        report += """Standard Output:\n--\n%s--""" % out
+                    if err:
+                        report += """Standard Error:\n--\n%s--""" % err
+                    report += "\n\nCompiled test failed unexpectedly!"
+                    return lit.Test.FAIL, report
+            finally:
+                try:
+                    os.remove(exec_path)
+                except:
+                    pass
+        return lit.Test.PASS, ""
+
+# name: The name of this test suite.
+config.name = 'libc++'
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = ['.cpp']
+
+# test_source_root: The root path where tests are located.
+config.test_source_root = os.path.dirname(__file__)
+
+# FIXME: Would be nice to Use -stdlib=libc++ option with Clang's that accept it.
+cxx_under_test = lit.params.get('cxx_under_test', None)
+if cxx_under_test is None:
+    lit.fatal('must specify user parameter cxx_under_test '
+              '(e.g., --param=cxx_under_test=clang++)')
+config.test_format = LibcxxTestFormat(cxx_under_test,
+                                      ['-nostdinc++',
+                                       '-I/usr/include/c++/v1',
+                                       '-nodefaultlibs', '-lc++',
+                                       '-lSystem'])
+
+config.target_triple = None