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<title>GNU Compiler Collection (GCC) Internals: C Tests</title>
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<a name="C-Tests"></a>
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<p>
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Next: <a href="libgcj-Tests.html#libgcj-Tests" accesskey="n" rel="next">libgcj Tests</a>, Previous: <a href="Ada-Tests.html#Ada-Tests" accesskey="p" rel="prev">Ada Tests</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="C-Language-Testsuites"></a>
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<h3 class="section">7.4 C Language Testsuites</h3>
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<p>GCC contains the following C language testsuites, in the
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<samp>gcc/testsuite</samp> directory:
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</p>
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<dl compact="compact">
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<dt><samp>gcc.dg</samp></dt>
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<dd><p>This contains tests of particular features of the C compiler, using the
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more modern ‘<samp>dg</samp>’ harness. Correctness tests for various compiler
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features should go here if possible.
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</p>
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<p>Magic comments determine whether the file
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is preprocessed, compiled, linked or run. In these tests, error and warning
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message texts are compared against expected texts or regular expressions
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given in comments. These tests are run with the options ‘<samp>-ansi -pedantic</samp>’
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unless other options are given in the test. Except as noted below they
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are not run with multiple optimization options.
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</p></dd>
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<dt><samp>gcc.dg/compat</samp></dt>
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<dd><p>This subdirectory contains tests for binary compatibility using
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<samp>lib/compat.exp</samp>, which in turn uses the language-independent support
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(see <a href="compat-Testing.html#compat-Testing">Support for testing binary compatibility</a>).
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</p></dd>
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<dt><samp>gcc.dg/cpp</samp></dt>
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<dd><p>This subdirectory contains tests of the preprocessor.
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</p></dd>
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<dt><samp>gcc.dg/debug</samp></dt>
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<dd><p>This subdirectory contains tests for debug formats. Tests in this
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subdirectory are run for each debug format that the compiler supports.
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</p></dd>
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<dt><samp>gcc.dg/format</samp></dt>
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<dd><p>This subdirectory contains tests of the <samp>-Wformat</samp> format
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checking. Tests in this directory are run with and without
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<samp>-DWIDE</samp>.
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</p></dd>
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<dt><samp>gcc.dg/noncompile</samp></dt>
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<dd><p>This subdirectory contains tests of code that should not compile and
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does not need any special compilation options. They are run with
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multiple optimization options, since sometimes invalid code crashes
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the compiler with optimization.
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</p></dd>
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<dt><samp>gcc.dg/special</samp></dt>
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<dd><p>FIXME: describe this.
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</p>
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</dd>
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<dt><samp>gcc.c-torture</samp></dt>
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<dd><p>This contains particular code fragments which have historically broken easily.
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These tests are run with multiple optimization options, so tests for features
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which only break at some optimization levels belong here. This also contains
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tests to check that certain optimizations occur. It might be worthwhile to
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separate the correctness tests cleanly from the code quality tests, but
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it hasn’t been done yet.
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</p>
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</dd>
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<dt><samp>gcc.c-torture/compat</samp></dt>
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<dd><p>FIXME: describe this.
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</p>
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<p>This directory should probably not be used for new tests.
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</p></dd>
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<dt><samp>gcc.c-torture/compile</samp></dt>
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<dd><p>This testsuite contains test cases that should compile, but do not
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need to link or run. These test cases are compiled with several
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different combinations of optimization options. All warnings are
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disabled for these test cases, so this directory is not suitable if
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you wish to test for the presence or absence of compiler warnings.
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While special options can be set, and tests disabled on specific
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platforms, by the use of <samp>.x</samp> files, mostly these test cases
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should not contain platform dependencies. FIXME: discuss how defines
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such as <code>NO_LABEL_VALUES</code> and <code>STACK_SIZE</code> are used.
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</p></dd>
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<dt><samp>gcc.c-torture/execute</samp></dt>
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<dd><p>This testsuite contains test cases that should compile, link and run;
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otherwise the same comments as for <samp>gcc.c-torture/compile</samp> apply.
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</p></dd>
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<dt><samp>gcc.c-torture/execute/ieee</samp></dt>
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<dd><p>This contains tests which are specific to IEEE floating point.
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</p></dd>
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<dt><samp>gcc.c-torture/unsorted</samp></dt>
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<dd><p>FIXME: describe this.
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</p>
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<p>This directory should probably not be used for new tests.
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</p></dd>
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<dt><samp>gcc.misc-tests</samp></dt>
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<dd><p>This directory contains C tests that require special handling. Some
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of these tests have individual expect files, and others share
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special-purpose expect files:
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</p>
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<dl compact="compact">
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<dt><samp><code>bprob*.c</code></samp></dt>
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<dd><p>Test <samp>-fbranch-probabilities</samp> using
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<samp>gcc.misc-tests/bprob.exp</samp>, which
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in turn uses the generic, language-independent framework
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(see <a href="profopt-Testing.html#profopt-Testing">Support for testing profile-directed
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optimizations</a>).
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</p>
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</dd>
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<dt><samp><code>gcov*.c</code></samp></dt>
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<dd><p>Test <code>gcov</code> output using <samp>gcov.exp</samp>, which in turn uses the
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language-independent support (see <a href="gcov-Testing.html#gcov-Testing">Support for testing gcov</a>).
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</p>
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</dd>
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<dt><samp><code>i386-pf-*.c</code></samp></dt>
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<dd><p>Test i386-specific support for data prefetch using <samp>i386-prefetch.exp</samp>.
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</p></dd>
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</dl>
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</dd>
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<dt><samp>gcc.test-framework</samp></dt>
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<dd><dl compact="compact">
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<dt><samp><code>dg-*.c</code></samp></dt>
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<dd><p>Test the testsuite itself using <samp>gcc.test-framework/test-framework.exp</samp>.
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</p></dd>
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</dl>
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</dd>
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</dl>
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<p>FIXME: merge in <samp>testsuite/README.gcc</samp> and discuss the format of
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test cases and magic comments more.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="libgcj-Tests.html#libgcj-Tests" accesskey="n" rel="next">libgcj Tests</a>, Previous: <a href="Ada-Tests.html#Ada-Tests" accesskey="p" rel="prev">Ada Tests</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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