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<a class="index-entry-id" id="index-Testing"></a>
<a class="index-entry-id" id="index-Installing-GCC_003a-Testing"></a>
<a class="index-entry-id" id="index-Testsuite"></a>

<p>Before you install GCC, we encourage you to run the testsuites and to
compare your results with results from a similar configuration that have
been submitted to the
<a class="uref" href="https://gcc.gnu.org/ml/gcc-testresults/">gcc-testresults mailing list</a>.
This step is optional and may require you to download additional software,
but it can give you confidence in your new GCC installation or point out
problems before you install and start using your new GCC.
</p>
<p>First, you must have <a class="uref" href="download.html">downloaded the testsuites</a>.
These are included in the source tarball.
</p>
<p>Second, you must have the testing tools installed.  This includes
<a class="uref" href="https://www.gnu.org/software/dejagnu/">DejaGnu</a>, Tcl, and Expect;
the DejaGnu site has links to these.
Some optional tests also require Python3 and pytest module.
</p>
<p>If the directories where <code class="command">runtest</code> and <code class="command">expect</code> were
installed are not in the <code class="env">PATH</code>, you may need to set the following
environment variables appropriately, as in the following example (which
assumes that DejaGnu has been installed under <samp class="file">/usr/local</samp>):
</p>
<div class="example smallexample">
<pre class="example-preformatted">TCL_LIBRARY = /usr/local/share/tcl8.0
DEJAGNULIBS = /usr/local/share/dejagnu
</pre></div>

<p>(On systems such as Cygwin, these paths are required to be actual
paths, not mounts or links; presumably this is due to some lack of
portability in the DejaGnu code.)
</p>

<p>Finally, you can run the testsuite (which may take a long time):
</p><div class="example smallexample">
<pre class="example-preformatted">cd <var class="var">objdir</var>; make -k check
</pre></div>

<p>This will test various components of GCC, such as compiler
front ends and runtime libraries.  While running the testsuite, DejaGnu
might emit some harmless messages resembling
&lsquo;<samp class="samp">WARNING: Couldn't find the global config file.</samp>&rsquo; or
&lsquo;<samp class="samp">WARNING: Couldn't find tool init file</samp>&rsquo; that can be ignored.
</p>
<p>If you are testing a cross-compiler, you may want to run the testsuite
on a simulator as described at <a class="uref" href="https://gcc.gnu.org/simtest-howto.html">https://gcc.gnu.org/simtest-howto.html</a>.
</p>
<div class="section-level-extent" id="How-can-you-run-the-testsuite-on-selected-tests_003f">
<h3 class="section"><span>How can you run the testsuite on selected tests?<a class="copiable-link" href="#How-can-you-run-the-testsuite-on-selected-tests_003f"> &para;</a></span></h3>

<p>In order to run sets of tests selectively, there are targets
&lsquo;<samp class="samp">make check-gcc</samp>&rsquo; and language specific &lsquo;<samp class="samp">make check-c</samp>&rsquo;,
&lsquo;<samp class="samp">make check-c++</samp>&rsquo;, &lsquo;<samp class="samp">make check-d</samp>&rsquo; &lsquo;<samp class="samp">make check-fortran</samp>&rsquo;,
&lsquo;<samp class="samp">make check-ada</samp>&rsquo;, &lsquo;<samp class="samp">make check-m2</samp>&rsquo;, &lsquo;<samp class="samp">make check-objc</samp>&rsquo;,
&lsquo;<samp class="samp">make check-obj-c++</samp>&rsquo;, &lsquo;<samp class="samp">make check-lto</samp>&rsquo; in the <samp class="file">gcc</samp>
subdirectory of the object directory.  You can also just run
&lsquo;<samp class="samp">make check</samp>&rsquo; in a subdirectory of the object directory.
</p>

<p>A more selective way to just run all <code class="command">gcc</code> execute tests in the
testsuite is to use
</p>
<div class="example smallexample">
<pre class="example-preformatted">make check-gcc RUNTESTFLAGS=&quot;execute.exp <var class="var">other-options</var>&quot;
</pre></div>

<p>Likewise, in order to run only the <code class="command">g++</code> &ldquo;old-deja&rdquo; tests in
the testsuite with filenames matching &lsquo;<samp class="samp">9805*</samp>&rsquo;, you would use
</p>
<div class="example smallexample">
<pre class="example-preformatted">make check-g++ RUNTESTFLAGS=&quot;old-deja.exp=9805* <var class="var">other-options</var>&quot;
</pre></div>

<p>The file-matching expression following <var class="var">filename</var><code class="command">.exp=</code> is treated
as a series of whitespace-delimited glob expressions so that multiple patterns
may be passed, although any whitespace must either be escaped or surrounded by
single quotes if multiple expressions are desired. For example,
</p>
<div class="example smallexample">
<pre class="example-preformatted">make check-g++ RUNTESTFLAGS=&quot;old-deja.exp=9805*\ virtual2.c <var class="var">other-options</var>&quot;
make check-g++ RUNTESTFLAGS=&quot;'old-deja.exp=9805* virtual2.c' <var class="var">other-options</var>&quot;
</pre></div>

<p>The <samp class="file">*.exp</samp> files are located in the testsuite directories of the GCC
source, the most important ones being <samp class="file">compile.exp</samp>,
<samp class="file">execute.exp</samp>, <samp class="file">dg.exp</samp> and <samp class="file">old-deja.exp</samp>.
To get a list of the possible <samp class="file">*.exp</samp> files, pipe the
output of &lsquo;<samp class="samp">make check</samp>&rsquo; into a file and look at the
&lsquo;<samp class="samp">Running &hellip;  .exp</samp>&rsquo; lines.
</p>
</div>
<div class="section-level-extent" id="Passing-options-and-running-multiple-testsuites">
<h3 class="section"><span>Passing options and running multiple testsuites<a class="copiable-link" href="#Passing-options-and-running-multiple-testsuites"> &para;</a></span></h3>

<p>You can pass multiple options to the testsuite using the
&lsquo;<samp class="samp">--target_board</samp>&rsquo; option of DejaGNU, either passed as part of
&lsquo;<samp class="samp">RUNTESTFLAGS</samp>&rsquo;, or directly to <code class="command">runtest</code> if you prefer to
work outside the makefiles.  For example,
</p>
<div class="example smallexample">
<pre class="example-preformatted">make check-g++ RUNTESTFLAGS=&quot;--target_board=unix/-O3/-fmerge-constants&quot;
</pre></div>

<p>will run the standard <code class="command">g++</code> testsuites (&ldquo;unix&rdquo; is the target name
for a standard native testsuite situation), passing
&lsquo;<samp class="samp">-O3 -fmerge-constants</samp>&rsquo; to the compiler on every test, i.e.,
slashes separate options.
</p>
<p>You can run the testsuites multiple times using combinations of options
with a syntax similar to the brace expansion of popular shells:
</p>
<div class="example smallexample">
<pre class="example-preformatted">...&quot;--target_board=arm-sim\{-mhard-float,-msoft-float\}\{-O1,-O2,-O3,\}&quot;
</pre></div>

<p>(Note the empty option caused by the trailing comma in the final group.)
The following will run each testsuite eight times using the &lsquo;<samp class="samp">arm-sim</samp>&rsquo;
target, as if you had specified all possible combinations yourself:
</p>
<div class="example smallexample">
<pre class="example-preformatted">--target_board='arm-sim/-mhard-float/-O1 \
                arm-sim/-mhard-float/-O2 \
                arm-sim/-mhard-float/-O3 \
                arm-sim/-mhard-float \
                arm-sim/-msoft-float/-O1 \
                arm-sim/-msoft-float/-O2 \
                arm-sim/-msoft-float/-O3 \
                arm-sim/-msoft-float'
</pre></div>

<p>They can be combined as many times as you wish, in arbitrary ways.  This
list:
</p>
<div class="example smallexample">
<pre class="example-preformatted">...&quot;--target_board=unix/-Wextra\{-O3,-fno-strength\}\{-fomit-frame,\}&quot;
</pre></div>

<p>will generate four combinations, all involving &lsquo;<samp class="samp">-Wextra</samp>&rsquo;.
</p>
<p>The disadvantage to this method is that the testsuites are run in serial,
which is a waste on multiprocessor systems.  For users with GNU Make and
a shell which performs brace expansion, you can run the testsuites in
parallel by having the shell perform the combinations and <code class="command">make</code>
do the parallel runs.  Instead of using &lsquo;<samp class="samp">--target_board</samp>&rsquo;, use a
special makefile target:
</p>
<div class="example smallexample">
<pre class="example-preformatted">make -j<var class="var">N</var> check-<var class="var">testsuite</var>//<var class="var">test-target</var>/<var class="var">option1</var>/<var class="var">option2</var>/...
</pre></div>

<p>For example,
</p>
<div class="example smallexample">
<pre class="example-preformatted">make -j3 check-gcc//sh-hms-sim/{-m1,-m2,-m3,-m3e,-m4}/{,-nofpu}
</pre></div>

<p>will run three concurrent &ldquo;make-gcc&rdquo; testsuites, eventually testing all
ten combinations as described above.  Note that this is currently only
supported in the <samp class="file">gcc</samp> subdirectory.  (To see how this works, try
typing <code class="command">echo</code> before the example given here.)
</p>

</div>
<div class="section-level-extent" id="How-to-interpret-test-results">
<h3 class="section"><span>How to interpret test results<a class="copiable-link" href="#How-to-interpret-test-results"> &para;</a></span></h3>

<p>The result of running the testsuite are various <samp class="file">*.sum</samp> and <samp class="file">*.log</samp>
files in the testsuite subdirectories.  The <samp class="file">*.log</samp> files contain a
detailed log of the compiler invocations and the corresponding
results, the <samp class="file">*.sum</samp> files summarize the results.  These summaries
contain status codes for all tests:
</p>
<ul class="itemize mark-bullet">
<li>PASS: the test passed as expected
</li><li>XPASS: the test unexpectedly passed
</li><li>FAIL: the test unexpectedly failed
</li><li>XFAIL: the test failed as expected
</li><li>UNSUPPORTED: the test is not supported on this platform
</li><li>ERROR: the testsuite detected an error
</li><li>WARNING: the testsuite detected a possible problem
</li></ul>

<p>It is normal for some tests to report unexpected failures.  At the
current time the testing harness does not allow fine grained control
over whether or not a test is expected to fail.  This problem should
be fixed in future releases.
</p>

</div>
<div class="section-level-extent" id="Submitting-test-results">
<h3 class="section"><span>Submitting test results<a class="copiable-link" href="#Submitting-test-results"> &para;</a></span></h3>

<p>If you want to report the results to the GCC project, use the
<samp class="file">contrib/test_summary</samp> shell script.  Start it in the <var class="var">objdir</var> with
</p>
<div class="example smallexample">
<pre class="example-preformatted"><var class="var">srcdir</var>/contrib/test_summary -p your_commentary.txt \
    -m gcc-testresults (a] gcc.gnu.org |sh
</pre></div>

<p>This script uses the <code class="command">Mail</code> program to send the results, so
make sure it is in your <code class="env">PATH</code>.  The file <samp class="file">your_commentary.txt</samp> is
prepended to the testsuite summary and should contain any special
remarks you have on your results or your build environment.  Please
do not edit the testsuite result block or the subject line, as these
messages may be automatically processed.
</p>
<hr />
<p>
<p><a class="uref" href="./index.html">Return to the GCC Installation page</a>
</p>


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