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153 lines
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153 lines
7.7 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>compat Testing - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Testsuites.html#Testsuites" title="Testsuites">
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<link rel="prev" href="profopt-Testing.html#profopt-Testing" title="profopt Testing">
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<link rel="next" href="Torture-Tests.html#Torture-Tests" title="Torture Tests">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Funding Free Software'', the Front-Cover
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(see below). A copy of the license is included in the section entitled
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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</head>
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<body>
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<div class="node">
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<a name="compat-Testing"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Torture-Tests.html#Torture-Tests">Torture Tests</a>,
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Previous: <a rel="previous" accesskey="p" href="profopt-Testing.html#profopt-Testing">profopt Testing</a>,
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Up: <a rel="up" accesskey="u" href="Testsuites.html#Testsuites">Testsuites</a>
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<hr>
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</div>
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<h3 class="section">7.9 Support for testing binary compatibility</h3>
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<p>The file <samp><span class="file">compat.exp</span></samp> provides language-independent support for
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binary compatibility testing. It supports testing interoperability of
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two compilers that follow the same ABI, or of multiple sets of
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compiler options that should not affect binary compatibility. It is
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intended to be used for testsuites that complement ABI testsuites.
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<p>A test supported by this framework has three parts, each in a
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separate source file: a main program and two pieces that interact
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with each other to split up the functionality being tested.
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<dl>
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<dt><samp><var>testname</var><span class="file">_main.</span><var>suffix</var></samp><dd>Contains the main program, which calls a function in file
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<samp><var>testname</var><span class="file">_x.</span><var>suffix</var></samp>.
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<br><dt><samp><var>testname</var><span class="file">_x.</span><var>suffix</var></samp><dd>Contains at least one call to a function in
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<samp><var>testname</var><span class="file">_y.</span><var>suffix</var></samp>.
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<br><dt><samp><var>testname</var><span class="file">_y.</span><var>suffix</var></samp><dd>Shares data with, or gets arguments from,
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<samp><var>testname</var><span class="file">_x.</span><var>suffix</var></samp>.
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</dl>
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<p>Within each test, the main program and one functional piece are
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compiled by the GCC under test. The other piece can be compiled by
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an alternate compiler. If no alternate compiler is specified,
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then all three source files are all compiled by the GCC under test.
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You can specify pairs of sets of compiler options. The first element
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of such a pair specifies options used with the GCC under test, and the
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second element of the pair specifies options used with the alternate
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compiler. Each test is compiled with each pair of options.
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<p><samp><span class="file">compat.exp</span></samp> defines default pairs of compiler options.
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These can be overridden by defining the environment variable
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<samp><span class="env">COMPAT_OPTIONS</span></samp> as:
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<pre class="smallexample"> COMPAT_OPTIONS="[list [list {<var>tst1</var>} {<var>alt1</var>}]
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...[list {<var>tstn</var>} {<var>altn</var>}]]"
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</pre>
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<p>where <var>tsti</var> and <var>alti</var> are lists of options, with <var>tsti</var>
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used by the compiler under test and <var>alti</var> used by the alternate
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compiler. For example, with
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<code>[list [list {-g -O0} {-O3}] [list {-fpic} {-fPIC -O2}]]</code>,
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the test is first built with <samp><span class="option">-g -O0</span></samp> by the compiler under
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test and with <samp><span class="option">-O3</span></samp> by the alternate compiler. The test is
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built a second time using <samp><span class="option">-fpic</span></samp> by the compiler under test
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and <samp><span class="option">-fPIC -O2</span></samp> by the alternate compiler.
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<p>An alternate compiler is specified by defining an environment
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variable to be the full pathname of an installed compiler; for C
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define <samp><span class="env">ALT_CC_UNDER_TEST</span></samp>, and for C++ define
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<samp><span class="env">ALT_CXX_UNDER_TEST</span></samp>. These will be written to the
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<samp><span class="file">site.exp</span></samp> file used by DejaGnu. The default is to build each
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test with the compiler under test using the first of each pair of
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compiler options from <samp><span class="env">COMPAT_OPTIONS</span></samp>. When
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<samp><span class="env">ALT_CC_UNDER_TEST</span></samp> or
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<samp><span class="env">ALT_CXX_UNDER_TEST</span></samp> is <code>same</code>, each test is built using
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the compiler under test but with combinations of the options from
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<samp><span class="env">COMPAT_OPTIONS</span></samp>.
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<p>To run only the C++ compatibility suite using the compiler under test
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and another version of GCC using specific compiler options, do the
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following from <samp><var>objdir</var><span class="file">/gcc</span></samp>:
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<pre class="smallexample"> rm site.exp
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make -k \
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ALT_CXX_UNDER_TEST=${alt_prefix}/bin/g++ \
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COMPAT_OPTIONS="<var>lists as shown above</var>" \
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check-c++ \
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RUNTESTFLAGS="compat.exp"
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</pre>
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<p>A test that fails when the source files are compiled with different
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compilers, but passes when the files are compiled with the same
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compiler, demonstrates incompatibility of the generated code or
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runtime support. A test that fails for the alternate compiler but
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passes for the compiler under test probably tests for a bug that was
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fixed in the compiler under test but is present in the alternate
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compiler.
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<p>The binary compatibility tests support a small number of test framework
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commands that appear within comments in a test file.
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<dl>
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<dt><code>dg-require-*</code><dd>These commands can be used in <samp><var>testname</var><span class="file">_main.</span><var>suffix</var></samp>
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to skip the test if specific support is not available on the target.
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<br><dt><code>dg-options</code><dd>The specified options are used for compiling this particular source
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file, appended to the options from <samp><span class="env">COMPAT_OPTIONS</span></samp>. When this
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command appears in <samp><var>testname</var><span class="file">_main.</span><var>suffix</var></samp> the options
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are also used to link the test program.
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<br><dt><code>dg-xfail-if</code><dd>This command can be used in a secondary source file to specify that
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compilation is expected to fail for particular options on particular
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targets.
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</dl>
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</body></html>
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