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documentation for regression.cpp
[SVN r8814]
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Jens Maurer
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regression.html
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regression.html
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<title>Boost Internal Regression Test Suite</title>
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</head>
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<body bgcolor="#FFFFFF" text="#000000">
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<table border="1" bgcolor="#007F7F" cellpadding="2">
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<tr>
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<td bgcolor="#FFFFFF"><img src="../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277" height="86"></td>
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<td><a href="../index.htm"><font face="Arial,Helvetica" color="#FFFFFF"><big>Home</big></font></a></td>
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<td><a href="../libs/libraries.htm"><font face="Arial,Helvetica" color="#FFFFFF"><big>Libraries</big></font></a></td>
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<td><a href="../people/people.htm"><font face="Arial,Helvetica" color="#FFFFFF"><big>People</big></font></a></td>
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<td><a href="../more/faq.htm"><font face="Arial,Helvetica" color="#FFFFFF"><big>FAQ</big></font></a></td>
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<td><a href="../more/index.htm"><font face="Arial,Helvetica" color="#FFFFFF"><big>More</big></font></a></td>
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</tr>
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</table>
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<h1>Internal Regression Test Suite</h1>
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Boost's internal regression test suite produces the
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<a href="../status/compiler_status.html">compiler status tables</a>.
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<h2>Requirements</h2>
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The test suite has been design according to the following requirements.
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<ul>
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<li>Pure ISO C++, no tools required except a C++ compiler.
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<li>Support for tests which expect an error
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<li>Flexible configuration
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<li>HTML output
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</ul>
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These requirements rule out any script-based approach such as dejagnu
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(requires Tcl and expect) or even shell scripts.
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<h2>Running Regression Tests</h2>
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The implementation is provided in a single source file named
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<a href="../status/regression.cpp">regression.cpp</a>.
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<p>
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You should be able to compile and link this file using whatever C++
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compiler is at your disposition. However, you may need to configure
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both the compiler and the standard library to use "strict" ISO
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compliance mode. Also, you need to extend the search path for include
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files with the main boost directory so that the header file
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<a href="../boost/config.hpp">boost/config.hpp</a>
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can be found. This header file is required to work around compiler
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deficiencies.
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<p>
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You can then start the resulting executable to run regression tests.
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By default, the regression test program reads the file "compiler.cfg"
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in the current directory to determine the list of compilers and their
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invocation syntax. After that, it reads the file "regression.cfg" in
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the current directory to determine the regression tests to run. The
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results of the regression tests are written in an HTML formatted text
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file. This file is by default named "cs-OS.html" in the current
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directory, where "OS" is a placeholder for the name of the operating
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system (e.g., "linux" or "win32").
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<p>
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To generate the
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<a href="../status/compiler_status.html">compiler status tables</a>,
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boost uses the files
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<a href="../status/compiler.cfg">status/compiler.cfg</a>
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and
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<a href="../status/regression.cfg">status/regression.cfg</a>.
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<p>
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The regression test program accepts some command-line options to alter
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its behavior.
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<p>
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<table border="1">
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<tr>
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<td>-h <em>or</em> --help</td>
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<td>prints a help message
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</tr>
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<tr>
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<td>--config <em>file</em></td>
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<td>Use <em>file</em> instead of "compiler.cfg" as the compiler
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configuration file. This allows for private compiler setups.</td>
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</tr>
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<tr>
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<td>--tests <em>file</em></td>
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<td>Use <em>file</em> instead of "regression.cfg" as the tests
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configuration file. This allows individual libraries to specify
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additional tests not to be published in the main
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<a href="../status/compiler_status.html">compiler status tables</a>.
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</td>
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</tr>
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<tr>
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<td>--boost <em>path</em></td>
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<td>Use <em>path</em> as the filesystem path to the main boost
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directory. The default is "..", i.e. the parent directory.</td>
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</tr>
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<tr>
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<td>--output <em>file</em><br>-o <em>file</em></td>
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<td>Write the HTML output to <em>file</em> instead of the default
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"cs-OS.html".</td>
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</tr>
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<tr>
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<td>--compiler <em>name</em></td>
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<td>Run the tests only with compiler <em>name</em>. The <em>name</em>
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must be defined in the second line of an applicable compiler
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configuration (see below). The default is to run the tests with all
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compilers suitable for the platform.</td>
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</tr>
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<tr>
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<td>--diff</td>
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<td>Read the HTML output file before writing it. In the HTML output,
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highlight differences in test outcomes compared to the previous
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run.</td>
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</tr>
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<tr>
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<td><em>test</em></td>
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<td>Run only the named test. The syntax is the same as in the
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configuration file (see below).</td>
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</tr>
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</table>
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<p>
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When running only a selected test, you must also provide an alternate
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HTML output filename with "--output" so that the full test output is
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not accidentally overwritten.
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<p>
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You should redirect the output (<code>std::cout</code>) and error
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(<code>std::cerr</code>) channels to a suitable log file for later
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inspection.
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<h2>Configuration Files</h2>
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In both configuration files, single-line comments starting with "//"
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at the leftmost column are ignored.
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<h3>Compiler Configuration</h3>
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The compiler configuration file can contain descriptions for an
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arbitrary number of compilers. Each compiler is configured by a block
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of six consecutive text lines.
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<ol>
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<li>Name of the operating system for which the entry is applicable
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(e.g., "linux" or "win32").
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<li>Name of the compiler; should be unique within one operating
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system. The name of the compiler should not contain the version
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number, because it is expected that regression tests are always run
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with the most recent compiler version available.
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<li>Name and version number of the compiler. This is printed on
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<code>std::cout</code> prior to running a test with that compiler.
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<li>Command-line invocation of the compiler to compile a single source
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file to an object file.
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<li>Command-line invocation of the compiler to compile a single source
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file to an executable.
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<li>Identification of the compiler for inclusion in the HTML output;
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may contain HTML tags such as <br>.
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</ol>
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The two command-lines are subject to the following substitutions:
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<ul>
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<li>Any string starting with a dollar symbol "$", then containing an
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arbitrary number of underscores, digits, or uppercase letters, is
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replaced by the value of the associated environment variable.
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<li>%include is replaced by the path given by the "--boost" command
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line option (".." by default). This should be used to extend the
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search path of your compiler so that the boost header files are found.
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<li>%source is the name of the source file to be compiled, qualified
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with the path given by the "--boost" command-line option (".." by
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default).
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</ul>
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<h3>Test Configuration</h3>
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The test configuration file can contain descriptions for an arbitrary
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number of tests. Each test is described by a single line. The first
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word (up to the first space) is the type of the test, the next word
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gives the filename of the test relative the directory to be given by the
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"--boost" command-line option. Optionally, additional words are
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passed on as command-line arguments when the test is executed (only
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for types "run" and "run-fail"). In these arguments, "%boost" is
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replaced by the path given by the "--boost" command-line option (".."
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by default).
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<p>
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The following test types are available:
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<ul>
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<li>compile: The given test file should compile successfully.
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Otherwise, the test fails.
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<li>compile-fail: The given test file should not compile successfully,
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but instead the compiler should give an error message. If the test
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does compile successfully, the test fails.
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<li>link: The given test file should compile and link successfully.
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Otherwise, the test fails. In particular, a <code>main</code>
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function must be present in the test file.
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<li>link-fail: The given test file should not compile and link
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successfully. It is not specified whether the compile or the link
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should not succeed. If the test does compile and link successfully,
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the test fails.
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<li>run: The given test file should compile and link successfully.
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After that, the resulting executable is invoked and should return a
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zero exit code. If any of these steps fail, the test fails.
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<li>run-fail: The given test file is compiled, linked, and, if an
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executable was successfully generated, it is invoked. Either
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compiling or linking should fail or the resulting executable should
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return a non-zero exit code. If compiling and linking succeeds and
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the resulting executable returns a zero exit code, the test fails.
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</ul>
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<h2>Adapting for a New Platform</h2>
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In order to adapt the regression test suite for a new platform, a few
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changes to the <a href="../status/regression.cpp">regression.cpp</a>
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are required.
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<ul>
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<li>Add an appropriate check for your platform in
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<code>get_host()</code> and return a unique string identifying the
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platform (this string is used to filter the compile configuration
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file).
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<li>Verify that <code>get_system_configuration()</code> is
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appropriately defined for your platform. For a Unix platform, it most
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likely is. The function may return a verbose HTML string describing
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the platform.
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</ul>
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You also need to configure the compilers available on your platform in
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"compiler.cfg" as described above.
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<p>
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<hr>
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2001-01-30<br>
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<a href="../people/jens_maurer.htm">Jens Maurer</a>
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</body>
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</html>
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