Installing GCC: Testing

[清钟沁桐]

Installing GCC: Testing
Please note that this is only applicable to current development
versions of GCC and GCC 3.0 or later. GCC 2.95.x does not come with a
testsuite.

Before you install GCC, you might wish to run the testsuite. This step
is optional and may require you to download additional software.

First, you must have downloaded the testsuites. The full distribution
contains testsuites; only if you downloaded the "core" compiler plus
any front ends, you do not have the testsuites.

Second, you must have a current version of dejagnu installed; dejagnu
1.3 is not sufficient.

Now you may need specific preparations:

In order to run the libio tests on targets which do not fully support
Unix/POSIX commands (e.g. Cygwin), the references to the dbz directory
have to be deleted from libio/configure.in.
The following environment variables must be set appropriately, as in
the following example (which assumes that dejagnu has been installed
under /usr/local):

TCL_LIBRARY = /usr/local/share/tcl8.0
DEJAGNULIBS = /usr/local/share/dejagnu
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.

Finally, you can run the testsuite (which may take a long time):

cd objdir; make -k check
The testing process will try to test as many components in the GCC
distribution as possible, including the C, C++ and Fortran compilers
as well as the C++ runtime libraries.

How can I run the test suite on selected tests?
As a first possibility to cut down the number of tests that are run it
is possible to use `make check-gcc` or `make check-g++` in the gcc
subdirectory of the object directory. To further cut down the tests
the following is possible:

make check-gcc RUNTESTFLAGS="execute.exp <other options>"
This will run all gcc execute tests in the testsuite.

make check-g++ RUNTESTFLAGS="old-deja.exp=9805* <other options>"
This will run the g++ "old-deja" tests in the testsuite where the
filename matches 9805*.

The *.exp files are located in the testsuite directories of the GCC
source, the most important ones being compile.exp, execute.exp, dg.exp
and old-deja.exp. To get a list of the possible *.exp files, pipe the
output of `make check` into a file and look at the "Running ... .exp"
lines.

How to interpret test results
After the testsuite has run you'll find various *.sum and *.log files
in the testsuite subdirectories. The *.log files contain a detailed
log of the compiler invocations and the corresponding results, the
*.sum files summarize the results. These summaries list all the tests
that have been run with a corresponding status code:

PASS: the test passed as expected
XPASS: the test unexpectedly passed
FAIL: the test unexpectedly failed
XFAIL: the test failed as expected
UNSUPPORTED: the test is not supported on this platform
ERROR: the testsuite detected an error
WARNING: the testsuite detected a possible problem
It is normal for some tests to report unexpected failures. At the
current time our testing harness does not allow fine grained control
over whether or not a test is expected to fail. We expect to fix this
problem in future releases.

Submitting test results
If you want to report the results to the GCC project, use the contrib/
test_summary shell script. Start it in the objdir with

srcdir/contrib/test_summary -p your_commentary.txt -m gcc-
testr...@gcc.gnu.org |sh
This script uses the Mail program to send the results, so make sure it
is in your PATH. The file your_commentary.txt 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 are
automatically parsed and presented at the GCC testresults web page.
Here you can also gather information on how specific tests behave on
different platforms and compare them with your results. A few failing
testcases are possible even on released versions and you should look
here first if you think your results are unreasonable.