First, you must have downloaded the testsuites. These are part of the full distribution, but if you downloaded the “core” compiler plus any front ends, you must download the testsuites separately.
Second, you must have the testing tools installed. This includes DejaGnu, Tcl, and Expect; the DejaGnu site has links to these.
If the directories where runtest and expect were installed are not in the PATH, you may need to set the following environment variables 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
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 ‘WARNING: Couldn't find the global config file.’ or ‘WARNING: Couldn't find tool init file’ that can be ignored.
If you are testing a cross-compiler, you may want to run the testsuite on a simulator as described at http://gcc.gnu.org/simtest-howto.html.
In order to run sets of tests selectively, there are targets ‘make check-gcc’ and language specific ‘make check-c’, ‘make check-c++’, ‘make check-fortran’, ‘make check-java’, ‘make check-ada’, ‘make check-objc’, ‘make check-obj-c++’, ‘make check-lto’ in the gcc subdirectory of the object directory. You can also just run ‘make check’ in a subdirectory of the object directory.
A more selective way to just run all gcc execute tests in the testsuite is to use
make check-gcc RUNTESTFLAGS="execute.exp other-options"
Likewise, in order to run only the g++ “old-deja” tests in the testsuite with filenames matching ‘9805*’, you would use
make check-g++ RUNTESTFLAGS="old-deja.exp=9805* other-options"
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.
You can pass multiple options to the testsuite using the ‘--target_board’ option of DejaGNU, either passed as part of ‘RUNTESTFLAGS’, or directly to runtest if you prefer to work outside the makefiles. For example,
make check-g++ RUNTESTFLAGS="--target_board=unix/-O3/-fmerge-constants"
will run the standard g++ testsuites (“unix” is the target name for a standard native testsuite situation), passing ‘-O3 -fmerge-constants’ to the compiler on every test, i.e., slashes separate options.
You can run the testsuites multiple times using combinations of options with a syntax similar to the brace expansion of popular shells:
..."--target_board=arm-sim\{-mhard-float,-msoft-float\}\{-O1,-O2,-O3,\}"
(Note the empty option caused by the trailing comma in the final group.) The following will run each testsuite eight times using the ‘arm-sim’ target, as if you had specified all possible combinations yourself:
--target_board=arm-sim/-mhard-float/-O1
--target_board=arm-sim/-mhard-float/-O2
--target_board=arm-sim/-mhard-float/-O3
--target_board=arm-sim/-mhard-float
--target_board=arm-sim/-msoft-float/-O1
--target_board=arm-sim/-msoft-float/-O2
--target_board=arm-sim/-msoft-float/-O3
--target_board=arm-sim/-msoft-float
They can be combined as many times as you wish, in arbitrary ways. This list:
..."--target_board=unix/-Wextra\{-O3,-fno-strength\}\{-fomit-frame,\}"
will generate four combinations, all involving ‘-Wextra’.
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 make do the parallel runs. Instead of using ‘--target_board’, use a special makefile target:
make -jN check-testsuite//test-target/option1/option2/...
For example,
make -j3 check-gcc//sh-hms-sim/{-m1,-m2,-m3,-m3e,-m4}/{,-nofpu}
will run three concurrent “make-gcc” testsuites, eventually testing all ten combinations as described above. Note that this is currently only supported in the gcc subdirectory. (To see how this works, try typing echo before the example given here.)
The Java runtime tests can be executed via ‘make check’ in the target/libjava/testsuite directory in the build tree.
The Mauve Project provides a suite of tests for the Java Class Libraries. This suite can be run as part of libgcj testing by placing the Mauve tree within the libjava testsuite at libjava/testsuite/libjava.mauve/mauve, or by specifying the location of that tree when invoking ‘make’, as in ‘make MAUVEDIR=~/mauve check’.
The result of running the testsuite are 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 contain status codes for all tests:
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.
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-testresults@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 may be automatically processed.