Do not terminate default test runs on test failure.

This patch is an updated version of
<https://sourceware.org/ml/libc-alpha/2014-01/msg00198.html> and
<https://sourceware.org/ml/libc-alpha/2014-03/msg00180.html>.

Normal practice for software testsuites is that rather than
terminating immediately when a test fails, they continue running and
report at the end on how many tests passed or failed.

The principle behind the glibc testsuite stopping on failure was
probably that the expected state is no failures and so any failure
indicates a problem such as miscompilation.  In practice, while this
is fairly close to true for native testing on x86_64 and x86 (kernel
bugs and race conditions can still cause intermittent failures), it's
less likely to be the case on other platforms, and so people testing
glibc run the testsuite with "make -k" and then examine the logs to
determine whether the failures are what they expect to fail on that
platform, possibly with some automation for the comparison.

This patch switches the glibc testsuite to the normal convention of
not stopping on failure - unless you use stop-on-test-failure=y, in
which case it behaves essentially as it did before (and does not
generate overall test summaries on failure).  Instead, the summary
tests.sum may contain tests that FAILed.  At the end of the test run,
any FAIL or ERROR lines from tests.sum are printed, and then it exits
with error status if there were any such lines.  In addition, build
failures will also cause the test run to stop - this has the
justification that those *do* indicate serious problems that should be
promptly fixed and aren't generally hard to fix (but apart from that,
avoiding the build stopping on those failures seems harder).

Note that unlike the previous patches in this series, this *does*
require people with automation around testing glibc to change their
processes - either to start using tests.sum / xtests.sum to track
failures and compare them with expectations (with or without also
using "make -k" and examining "make" logs to identify build failures),
or else to use stop-on-test-failure=y and ignore the new tests.sum /
xtests.sum mechanism.  (If all you check is the exit status from "make
check", no changes are needed unless you want to avoid test runs
continuing after the first failure.)

Tested x86_64.

	* scripts/evaluate-test.sh: Handle fourth argument to determine
	whether test run should stop on failure.
	* Makeconfig (stop-on-test-failure): New variable.
	(evaluate-test): Pass fourth argument to evaluate-test.sh based on
	$(stop-on-test-failure).
	* Makefile (tests): Give a summary of results from testing and
	exit with failure status if they include an ERROR or FAIL.
	(xtests): Likewise.
	* manual/install.texi (Configuring and compiling): Mention
	stop-on-test-failure=y.
	* INSTALL: Regenerated.

1 files changed, 6 insertions, 0 deletions

diff --git a/INSTALL b/INSTALL
index f845940..13fb678 100644
--- a/INSTALL
+++ b/INSTALL
@@ -203,6 +203,12 @@ The tests (and later installation) use some pre-existing files of the
 system such as `/etc/passwd', `/etc/nsswitch.conf' and others.  These
 files must all contain correct and sensible content.
 
+   Normally, `make check' will run all the tests before reporting all
+problems found and exiting with error status if any problems occurred.
+You can specify `stop-on-test-failure=y' when running `make check' to
+make the test run stop and exit with an error status immediately when a
+failure occurs.
+
    To format the `GNU C Library Reference Manual' for printing, type
 `make dvi'.  You need a working TeX installation to do this.  The
 distribution builds the on-line formatted version of the manual, as