fate: Add a target for listing failed tests

If running tests with "make -j<N> fate", the execution will stop
after the first failing test. To get an overview of the whole
test suite, one rather would run "make -k -j<N> fate", which then
again buries the results about what tests actually failed further
up in the console log.

Add a target so one can run "make fate-list-failing", to see a list
of all tests that failed the last time they were executed.

Also add a companion target "fate-clear-reports" which removes all
the old test reports. (When executing a subset of tests, the report
files of all tests that aren't executed stay untouched. This also
allows getting rid of reports for tests that no longer are present
in the testsuite.)

Co-authored-by: Alexander Strasser <eclipse7@gmx.net>

Signed-off-by: Martin Storsjö <martin@martin.st>

doc/build_system.txt

@@ -30,6 +30,13 @@ fate
 fate-list
     List all fate/regression test targets.
 
+fate-list-failing
+    List the fate tests that failed the last time they were executed.
+
+fate-clear-reports
+    Remove the test reports from previous test executions (getting rid of
+    potentially stale results from fate-list-failing).
+
 install
     Install headers, libraries and programs.
 

doc/fate.texi

@@ -208,6 +208,13 @@ Download/synchronize sample files to the configured samples directory.
 @item fate-list
 Will list all fate/regression test targets.
 
+@item fate-list-failing
+List the fate tests that failed the last time they were executed.
+
+@item fate-clear-reports
+Remove the test reports from previous test executions (getting rid of
+potentially stale results from fate-list-failing).
+
 @item fate
 Run the FATE test suite (requires the fate-suite dataset).
 @end table

tests/Makefile

@@ -313,6 +313,12 @@ $(FATE): $(FATE_UTILS:%=tests/%$(HOSTEXESUF)) | $(FATE_OUTDIRS)
 fate-list:
 	@printf '%s\n' $(sort $(FATE))
 
+fate-list-failing:
+	@! ls tests/data/fate/*.rep >/dev/null 2>&1 || awk -F: '$$2 != 0 { print "fate-" $$1 }' tests/data/fate/*.rep
+
+fate-clear-reports:
+	@rm -f tests/data/fate/*.rep
+
 coverage.info: TAG = LCOV
 coverage.info:
 	$(M)lcov -q -d $(CURDIR) -b $(patsubst src%,./,$(SRC_LINK)) --capture | \