4 You can use QMTest to test G++. (In the future, it may be possible to
5 test other parts of GCC with QMTest as well, but it is not possible
8 The use of QMTest to run the G++ tests has not been approved as an
9 officially supported testing procedure. Therefore, you must run the
10 tests using DejaGNU (with "make check-g++") before committing changes
13 QMTest emulates DejaGNU behavior very closely when running the tests.
15 QMTest has two output modes: a DejaGNU emulation mode and a native
18 In the DejaGNU mode, you should receive output that is almost exactly
19 the same as the DejaGNU output; in particular, you should see the same
20 number of passes, failures, etc. When using the DejaGNU-style output,
21 QMTest uses the "xfail" indications in the test cases to determine
22 which tests are expected to pass and which are expected to fail, and
23 presents that information in the same way as DejaGNU.
25 In the QMTest mode, the number of passes and failures will be
26 different from that obtained when using DejaGNU. The reason is that a
27 single source file may contain multiple DejaGNU tests. In DejaGNU,
28 each line where a diagnostic is expected is considered a separate
29 test. Testing for successful compilation and testing for successful
30 execution of the generated program are considered separate tests. So,
31 a single source file "test.C" could contain, say, seven tests; some of
32 which might pass and some of which might fail.
34 In the QMTest mode, each source file is considered a single test. If
35 any of the seven sub-tests fail, the entire test is considered to
36 fail. However, QMTest does present information about *why* the test
37 failed, so the same information is effectively available.
39 In the QMTest mode, whether or not a test is expected to fail is
40 determined not by an indication in the test, but rather by comparing
41 the new results to the results of a previous run. Testing for whether
42 a change caused a regression is very simple: run the tests before
43 making the change, run them again after making the change, and let
44 QMTest compare the results.
46 The mode chosen only affects the output from QMTest, not how it runs
47 the tests or how it stores the data. Therefore, if you choose to run
48 in the QMTest mode and later want to get the DejaGNU style output, or
49 vice versa, you can do that as described below.
54 You must download and install the following software:
56 - Python 2.2 (or greater)
58 See http://www.python.org.
60 You may already have Python on your system; in particular, many
61 GNU/Linux systems ship with Python installed.
63 Installation instructions are available on the web-site.
65 - A current version of QMTest. No released version provides all of
66 the functionality required, so you must obtain QMTest from CVS.
68 To do that, follow the instructions at:
70 http://www.codesourcery.com/qmtest
72 Installation instructions are available in the file called README
73 after you check out QMTest.
75 - The "qmtc" and "qmtest_gcc" QMTest support packages. These are
76 available from the same CVS repository as QMTest. For example, to
79 cvs -d :pserver:anoncvs@cvs.codesourcery.com:/home/qm/Repository \
82 You do not have to install these packages; you need only check them
88 First, you must set QMTEST_CLASS_PATH so that it can find the qmtc and
89 qmtest_gcc support packages:
91 export QMTEST_CLASS_PATH=/path/to/qmtc:/path/to/qmtest_gcc
93 The, run "make qmtest-g++" in the gcc directory of your build tree.
95 Here are some more advanced usage instructions:
97 1. To run a particular set of tests (rather than all of the tests),
98 use the make variable "QMTEST_GPP_TESTS". For example,
100 make QMTEST_GPP_TESTS="g++.dg" qmtest-g++
102 will run only the tests in the g++.dg subdirectory, and:
104 make QMTEST_GPP_TESTS="g++.dg/special/conpr-1.C \
105 g++.old-deja/g++.other/access2.C"
108 will run only the two tests indicated.
110 2. To run qmtest with particular flags, use the make variables
111 "QMTESTFLAGS" and "QMTESTRUNFLAGS". For example:
113 make QMTESTFLAGS="-v" QMTESTRUNFLAGS="-f full" qmtest-g++
115 will run qmtest like this:
117 qmtest -v run -f full ...
119 (The "-f full" mode will provide detailed information about each
122 3. To run the compiler with particular flags, use QMTESTRUNFLAGS to
123 set the QMTest context variable "CompilerTable.cplusplus_options",
127 QMTESTRUNFLAGS='-c CompilerTable.cplusplus_options="-funroll-loops"' \
130 The compiler will then use the "-funroll-loops" switch when
133 4. If qmtest is not in your path, you can indicate the full path to
134 QMTest by using the make variable "QMTEST_PATH", like this:
136 make QMTEST_PATH=/path/to/qmtest qmtest-g++
138 5. To start the QMTest GUI, use:
142 (Note that this will run the program called "mozilla" in your path.
143 If you want to use another browser, you must configure qmtest as
144 described in its manual.)
146 Bear in mind that the QMTest GUI is insecure; malicious users with
147 access to your machine may be able to run commands as if they were
148 you. The QMTest GUI only binds to the loopback IP addresss, which
149 provides a measure of security, but not enough for use in untrusted
152 6. If you have a multiprocessor, you can run the tests in parallel by
153 passing the "-j" option to qmtest:
155 make QMTESTRUNFLAGS="-j 4" qmtest-g++
157 will run tests in four threads. (It is also possible to run tests
158 across multiple machines; for more information see the QMTest
161 7. If a test (say "g++.dg/abi/bitfield1.C") fails, and you want to get
162 more detailed information, you can do:
165 qmtest summarize g++.qmr g++.dg/abi/bitfield1.C
167 to get more information about the commands that were run and the