Support expected failures in .test-result files

["Joseph S. Myers" <joseph at codesourcery dot com>]

This patch, an updated version of
<https://sourceware.org/ml/libc-alpha/2014-01/msg00195.html> now
proposed for inclusion in glibc, makes it possible for .test-result
files for individual tests to contain XPASS and XFAIL rather than PASS
and FAIL in cases where failure is expected.  This replaces the
marking of two individual tests with "-" to cause them to be expected
at makefile level to fail; evaluate-test.sh will ensure it exits with
status 0 for an expected failure.

Tested x86_64.

2014-02-27  Joseph Myers  <joseph@codesourcery.com>

	* scripts/evaluate-test.sh: Take new argument indicating whether
	failure is expected.
	* Makeconfig (evaluate-test): Pass argument to evaluate-test.sh
	indicating whether failure is expected.
	* conform/Makefile (test-xfail-run-conformtest): New variable.
	($(objpfx)run-conformtest.out): Don't expect to fail at makefile
	level.
	* posix/Makefile (test-xfail-annexc): New variable.
	($(objpfx)annexc.out): Don't expect to fail at makefile level.

diff --git a/Makeconfig b/Makeconfig
index 21a7d6e..3709c88 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -1083,8 +1083,11 @@ endif
 # The name to give to a test in test results summaries.
 test-name = $(strip $(patsubst %.out, %, $(patsubst $(common-objpfx)%, %, $@)))
 
-# Command to output a test status line (such as PASS: test-name).
+# Command to output a test status line (such as PASS: test-name).  If
+# test-xfail-$(@F:.out=) has a nonempty value, the status will be
+# XPASS or XFAIL rather than PASS or FAIL.
 evaluate-test = $(..)scripts/evaluate-test.sh $(test-name) $$? \
+		  $(if $(test-xfail-$(@F:.out=)),true,false) \
 		  > $(common-objpfx)$(test-name).test-result
 
 endif # Makeconfig not yet included
diff --git a/conform/Makefile b/conform/Makefile
index 41f0bb3..40081f3 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -30,10 +30,11 @@ tests: $(objpfx)run-conformtest.out
 endif
 endif
 
+test-xfail-run-conformtest = yes
 $(objpfx)run-conformtest.out: run-conformtest.sh conformtest.pl \
 			      $(wildcard data/*.h-data) \
 			      $(wildcard data/*/*.h-data)
-	-$(BASH) -e $< $(objpfx) $(PERL) '$(CC)' \
+	$(BASH) -e $< $(objpfx) $(PERL) '$(CC)' \
 	  '-I../include $(+sysdep-includes) $(sysincludes) -I..'; \
 	$(evaluate-test)
 
diff --git a/posix/Makefile b/posix/Makefile
index 304238f..b41055a 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -233,8 +233,9 @@ tests: $(objpfx)bug-regex2-mem $(objpfx)bug-regex14-mem \
 xtests: $(objpfx)bug-ga2-mem
 endif
 
+test-xfail-annexc = yes
 $(objpfx)annexc.out: $(objpfx)annexc
-	-$(dir $<)$(notdir $<) '$(CC)' \
+	$(dir $<)$(notdir $<) '$(CC)' \
 	  '$(patsubst %,-I../%,$(sorted-subdirs)) -I../include $(+sysdep-includes) $(sysincludes) -I..' > $@; \
 	$(evaluate-test)
 
diff --git a/scripts/evaluate-test.sh b/scripts/evaluate-test.sh
index 9cb6435..c8f5012 100755
--- a/scripts/evaluate-test.sh
+++ b/scripts/evaluate-test.sh
@@ -17,10 +17,12 @@
 # License along with the GNU C Library; if not, see
 # <http://www.gnu.org/licenses/>.
 
-# usage: evaluate-test.sh test_name rc
+# usage: evaluate-test.sh test_name rc xfail
 
 test_name=$1
 rc=$2
+orig_rc=$rc
+xfail=$3
 
 if [ $rc -eq 0 ]; then
   result="PASS"
@@ -28,6 +30,11 @@ else
   result="FAIL"
 fi
 
+if $xfail; then
+  result="X$result"
+  rc=0
+fi
+
 echo "$result: $test_name"
-echo "original exit status $rc"
+echo "original exit status $orig_rc"
 exit $rc

-- 
Joseph S. Myers
joseph@codesourcery.com