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<h1 class="settitle" align="center">Installing GCC: Testing</h1>


<a name="index-Testing"></a>
<a name="index-Installing-GCC_003a-Testing"></a>
<a name="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 href="https://gcc.gnu.org/ml/gcc-testresults/">gcc-testresults mailing list</a>.
Some of these archived results are linked from the build status lists
at <a href="https://gcc.gnu.org/buildstat.html">https://gcc.gnu.org/buildstat.html</a>, although not everyone who
reports a successful build runs the testsuites and submits the results.
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 href="download.html">downloaded the testsuites</a>.
These are part of the full distribution, but if you downloaded the
&ldquo;core&rdquo; compiler plus any front ends, you must download the testsuites
separately.
</p>
<p>Second, you must have the testing tools installed.  This includes
<a 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>runtest</code> and <code>expect</code> were
installed are not in the <code>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>/usr/local</samp>):
</p>
<div class="smallexample">
<pre class="smallexample">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="smallexample">
<pre class="smallexample">cd <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>WARNING: Couldn't find the global config file.</samp>&rsquo; or
&lsquo;<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 href="https://gcc.gnu.org/simtest-howto.html">https://gcc.gnu.org/simtest-howto.html</a>.
</p>
<a name="How-can-you-run-the-testsuite-on-selected-tests_003f"></a>
<h3 class="section">How can you run the testsuite on selected tests?</h3>

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

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

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

<p>The file-matching expression following <var>filename</var><code>.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="smallexample">
<pre class="smallexample">make check-g++ RUNTESTFLAGS=&quot;old-deja.exp=9805*\ virtual2.c <var>other-options</var>&quot;
make check-g++ RUNTESTFLAGS=&quot;'old-deja.exp=9805* virtual2.c' <var>other-options</var>&quot;
</pre></div>

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

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

<p>will run the standard <code>g++</code> testsuites (&ldquo;unix&rdquo; is the target name
for a standard native testsuite situation), passing
&lsquo;<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="smallexample">
<pre class="smallexample">&hellip;&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>arm-sim</samp>&rsquo;
target, as if you had specified all possible combinations yourself:
</p>
<div class="smallexample">
<pre class="smallexample">--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="smallexample">
<pre class="smallexample">&hellip;&quot;--target_board=unix/-Wextra\{-O3,-fno-strength\}\{-fomit-frame,\}&quot;
</pre></div>

<p>will generate four combinations, all involving &lsquo;<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>make</code>
do the parallel runs.  Instead of using &lsquo;<samp>--target_board</samp>&rsquo;, use a
special makefile target:
</p>
<div class="smallexample">
<pre class="smallexample">make -j<var>N</var> check-<var>testsuite</var>//<var>test-target</var>/<var>option1</var>/<var>option2</var>/&hellip;
</pre></div>

<p>For example,
</p>
<div class="smallexample">
<pre class="smallexample">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>gcc</samp> subdirectory.  (To see how this works, try
typing <code>echo</code> before the example given here.)
</p>

<a name="How-to-interpret-test-results"></a>
<h3 class="section">How to interpret test results</h3>

<p>The result of running the testsuite are various <samp>*.sum</samp> and <samp>*.log</samp>
files in the testsuite subdirectories.  The <samp>*.log</samp> files contain a
detailed log of the compiler invocations and the corresponding
results, the <samp>*.sum</samp> files summarize the results.  These summaries
contain status codes for all tests:
</p>
<ul>
<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>

<a name="Submitting-test-results"></a>
<h3 class="section">Submitting test results</h3>

<p>If you want to report the results to the GCC project, use the
<samp>contrib/test_summary</samp> shell script.  Start it in the <var>objdir</var> with
</p>
<div class="smallexample">
<pre class="smallexample"><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>Mail</code> program to send the results, so
make sure it is in your <code>PATH</code>.  The file <samp>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 href="./index.html">Return to the GCC Installation page</a>
</p>


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