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315 lines
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HTML
315 lines
12 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 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 no
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Invariant Sections, the Front-Cover texts being (a) (see below), and
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with the Back-Cover Texts being (b) (see below). A copy of the
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license is included in the section entitled "GNU
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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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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Installing GCC</title>
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<meta name="description" content="Installing GCC">
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<meta name="keywords" content="Installing GCC">
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<meta name="resource-type" content="document">
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</style>
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</head>
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<body lang="en">
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<h1 class="settitle" align="center">Installing GCC</h1>
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<a name="index-Testing"></a>
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<a name="index-Installing-GCC_003a-Testing"></a>
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<a name="index-Testsuite"></a>
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<p>Before you install GCC, we encourage you to run the testsuites and to
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compare your results with results from a similar configuration that have
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been submitted to the
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<a href="http://gcc.gnu.org/ml/gcc-testresults/">gcc-testresults mailing list</a>.
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Some of these archived results are linked from the build status lists
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at <a href="http://gcc.gnu.org/buildstat.html">http://gcc.gnu.org/buildstat.html</a>, although not everyone who
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reports a successful build runs the testsuites and submits the results.
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This step is optional and may require you to download additional software,
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but it can give you confidence in your new GCC installation or point out
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problems before you install and start using your new GCC.
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</p>
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<p>First, you must have <a href="download.html">downloaded the testsuites</a>.
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These are part of the full distribution, but if you downloaded the
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“core” compiler plus any front ends, you must download the testsuites
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separately.
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</p>
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<p>Second, you must have the testing tools installed. This includes
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<a href="http://www.gnu.org/software/dejagnu/">DejaGnu</a>, Tcl, and Expect;
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the DejaGnu site has links to these. For running the BRIG frontend
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tests, a tool to assemble the binary BRIGs from HSAIL text,
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<a href="https://github.com/HSAFoundation/HSAIL-Tools/">HSAILasm</a> must
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be installed.
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</p>
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<p>If the directories where <code>runtest</code> and <code>expect</code> were
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installed are not in the <code>PATH</code>, you may need to set the following
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environment variables appropriately, as in the following example (which
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assumes that DejaGnu has been installed under <samp>/usr/local</samp>):
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</p>
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<div class="smallexample">
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<pre class="smallexample">TCL_LIBRARY = /usr/local/share/tcl8.0
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DEJAGNULIBS = /usr/local/share/dejagnu
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</pre></div>
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<p>(On systems such as Cygwin, these paths are required to be actual
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paths, not mounts or links; presumably this is due to some lack of
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portability in the DejaGnu code.)
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</p>
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<p>Finally, you can run the testsuite (which may take a long time):
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</p><div class="smallexample">
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<pre class="smallexample">cd <var>objdir</var>; make -k check
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</pre></div>
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<p>This will test various components of GCC, such as compiler
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front ends and runtime libraries. While running the testsuite, DejaGnu
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might emit some harmless messages resembling
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‘<samp>WARNING: Couldn't find the global config file.</samp>’ or
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‘<samp>WARNING: Couldn't find tool init file</samp>’ that can be ignored.
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</p>
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<p>If you are testing a cross-compiler, you may want to run the testsuite
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on a simulator as described at <a href="http://gcc.gnu.org/simtest-howto.html">http://gcc.gnu.org/simtest-howto.html</a>.
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</p>
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<a name="How-can-you-run-the-testsuite-on-selected-tests_003f"></a>
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<h3 class="section">How can you run the testsuite on selected tests?</h3>
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<p>In order to run sets of tests selectively, there are targets
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‘<samp>make check-gcc</samp>’ and language specific ‘<samp>make check-c</samp>’,
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‘<samp>make check-c++</samp>’, ‘<samp>make check-fortran</samp>’,
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‘<samp>make check-ada</samp>’, ‘<samp>make check-objc</samp>’, ‘<samp>make check-obj-c++</samp>’,
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‘<samp>make check-lto</samp>’
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in the <samp>gcc</samp> subdirectory of the object directory. You can also
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just run ‘<samp>make check</samp>’ in a subdirectory of the object directory.
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</p>
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<p>A more selective way to just run all <code>gcc</code> execute tests in the
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testsuite is to use
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</p>
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<div class="smallexample">
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<pre class="smallexample">make check-gcc RUNTESTFLAGS="execute.exp <var>other-options</var>"
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</pre></div>
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<p>Likewise, in order to run only the <code>g++</code> “old-deja” tests in
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the testsuite with filenames matching ‘<samp>9805*</samp>’, you would use
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</p>
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<div class="smallexample">
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<pre class="smallexample">make check-g++ RUNTESTFLAGS="old-deja.exp=9805* <var>other-options</var>"
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</pre></div>
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<p>The file-matching expression following <var>filename</var><code>.exp=</code> is treated
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as a series of whitespace-delimited glob expressions so that multiple patterns
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may be passed, although any whitespace must either be escaped or surrounded by
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single quotes if multiple expressions are desired. For example,
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</p>
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<div class="smallexample">
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<pre class="smallexample">make check-g++ RUNTESTFLAGS="old-deja.exp=9805*\ virtual2.c <var>other-options</var>"
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make check-g++ RUNTESTFLAGS="'old-deja.exp=9805* virtual2.c' <var>other-options</var>"
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</pre></div>
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<p>The <samp>*.exp</samp> files are located in the testsuite directories of the GCC
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source, the most important ones being <samp>compile.exp</samp>,
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<samp>execute.exp</samp>, <samp>dg.exp</samp> and <samp>old-deja.exp</samp>.
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To get a list of the possible <samp>*.exp</samp> files, pipe the
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output of ‘<samp>make check</samp>’ into a file and look at the
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‘<samp>Running … .exp</samp>’ lines.
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</p>
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<a name="Passing-options-and-running-multiple-testsuites"></a>
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<h3 class="section">Passing options and running multiple testsuites</h3>
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<p>You can pass multiple options to the testsuite using the
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‘<samp>--target_board</samp>’ option of DejaGNU, either passed as part of
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‘<samp>RUNTESTFLAGS</samp>’, or directly to <code>runtest</code> if you prefer to
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work outside the makefiles. For example,
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</p>
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<div class="smallexample">
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<pre class="smallexample">make check-g++ RUNTESTFLAGS="--target_board=unix/-O3/-fmerge-constants"
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</pre></div>
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<p>will run the standard <code>g++</code> testsuites (“unix” is the target name
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for a standard native testsuite situation), passing
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‘<samp>-O3 -fmerge-constants</samp>’ to the compiler on every test, i.e.,
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slashes separate options.
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</p>
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<p>You can run the testsuites multiple times using combinations of options
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with a syntax similar to the brace expansion of popular shells:
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</p>
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<div class="smallexample">
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<pre class="smallexample">…"--target_board=arm-sim\{-mhard-float,-msoft-float\}\{-O1,-O2,-O3,\}"
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</pre></div>
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<p>(Note the empty option caused by the trailing comma in the final group.)
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The following will run each testsuite eight times using the ‘<samp>arm-sim</samp>’
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target, as if you had specified all possible combinations yourself:
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</p>
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<div class="smallexample">
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<pre class="smallexample">--target_board='arm-sim/-mhard-float/-O1 \
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arm-sim/-mhard-float/-O2 \
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arm-sim/-mhard-float/-O3 \
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arm-sim/-mhard-float \
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arm-sim/-msoft-float/-O1 \
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arm-sim/-msoft-float/-O2 \
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arm-sim/-msoft-float/-O3 \
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arm-sim/-msoft-float'
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</pre></div>
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<p>They can be combined as many times as you wish, in arbitrary ways. This
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list:
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</p>
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<div class="smallexample">
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<pre class="smallexample">…"--target_board=unix/-Wextra\{-O3,-fno-strength\}\{-fomit-frame,\}"
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</pre></div>
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<p>will generate four combinations, all involving ‘<samp>-Wextra</samp>’.
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</p>
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<p>The disadvantage to this method is that the testsuites are run in serial,
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which is a waste on multiprocessor systems. For users with GNU Make and
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a shell which performs brace expansion, you can run the testsuites in
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parallel by having the shell perform the combinations and <code>make</code>
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do the parallel runs. Instead of using ‘<samp>--target_board</samp>’, use a
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special makefile target:
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</p>
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<div class="smallexample">
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<pre class="smallexample">make -j<var>N</var> check-<var>testsuite</var>//<var>test-target</var>/<var>option1</var>/<var>option2</var>/…
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</pre></div>
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<p>For example,
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</p>
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<div class="smallexample">
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<pre class="smallexample">make -j3 check-gcc//sh-hms-sim/{-m1,-m2,-m3,-m3e,-m4}/{,-nofpu}
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</pre></div>
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<p>will run three concurrent “make-gcc” testsuites, eventually testing all
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ten combinations as described above. Note that this is currently only
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supported in the <samp>gcc</samp> subdirectory. (To see how this works, try
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typing <code>echo</code> before the example given here.)
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</p>
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<a name="How-to-interpret-test-results"></a>
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<h3 class="section">How to interpret test results</h3>
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<p>The result of running the testsuite are various <samp>*.sum</samp> and <samp>*.log</samp>
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files in the testsuite subdirectories. The <samp>*.log</samp> files contain a
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detailed log of the compiler invocations and the corresponding
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results, the <samp>*.sum</samp> files summarize the results. These summaries
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contain status codes for all tests:
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</p>
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<ul>
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<li> PASS: the test passed as expected
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</li><li> XPASS: the test unexpectedly passed
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</li><li> FAIL: the test unexpectedly failed
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</li><li> XFAIL: the test failed as expected
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</li><li> UNSUPPORTED: the test is not supported on this platform
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</li><li> ERROR: the testsuite detected an error
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</li><li> WARNING: the testsuite detected a possible problem
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</li></ul>
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<p>It is normal for some tests to report unexpected failures. At the
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current time the testing harness does not allow fine grained control
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over whether or not a test is expected to fail. This problem should
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be fixed in future releases.
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</p>
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<a name="Submitting-test-results"></a>
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<h3 class="section">Submitting test results</h3>
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<p>If you want to report the results to the GCC project, use the
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<samp>contrib/test_summary</samp> shell script. Start it in the <var>objdir</var> with
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</p>
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<div class="smallexample">
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<pre class="smallexample"><var>srcdir</var>/contrib/test_summary -p your_commentary.txt \
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-m gcc-testresults@gcc.gnu.org |sh
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</pre></div>
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<p>This script uses the <code>Mail</code> program to send the results, so
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make sure it is in your <code>PATH</code>. The file <samp>your_commentary.txt</samp> is
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prepended to the testsuite summary and should contain any special
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remarks you have on your results or your build environment. Please
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do not edit the testsuite result block or the subject line, as these
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messages may be automatically processed.
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</p>
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<hr />
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<p>
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<p><a href="./index.html">Return to the GCC Installation page</a>
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</p>
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<hr>
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</body>
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</html>
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