Support skipped tests

Knowing whether a test failed to run as its prerequisites were not
available, or whether those prerequisites were available and produced
unexpected/incorrect results, is a useful differentiation.

Add support for skipped tests by testing for exit code 77, used through
autotools/piglit/etc to denote a test which detected this and decided to
skip.

authors.txt

@@ -56,3 +56,4 @@ Aurelien Jarno
 Mark Schulte
 Paulo Antonio Alvarez
 Olexa Bilaniuk
+Daniel Stone

mesontest.py

@@ -26,6 +26,10 @@ import concurrent.futures as conc
 import platform
 import signal
 
+# GNU autotools interprets a return code of 77 from tests it executes to
+# mean that the test should be skipped.
+GNU_SKIP_RETURNCODE = 77
+
 def is_windows():
     platname = platform.system().lower()
     return platname == 'windows' or 'mingw' in platname
@@ -213,6 +217,8 @@ class TestHarness:
                 stde = decode(stde)
             if timed_out:
                 res = 'TIMEOUT'
+            if p.returncode == GNU_SKIP_RETURNCODE:
+                res = 'SKIP'
             elif (not test.should_fail and p.returncode == 0) or \
                 (test.should_fail and p.returncode != 0):
                 res = 'OK'
@@ -230,7 +236,8 @@ class TestHarness:
             (num, name, padding1, result.res, padding2, result.duration)
         print(result_str)
         result_str += "\n\n" + result.get_log()
-        if (result.returncode != 0) != result.should_fail:
+        if (result.returncode != GNU_SKIP_RETURNCODE) and \
+            (result.returncode != 0) != result.should_fail:
             self.error_count += 1
             if self.options.print_errorlogs:
                 self.collected_logs.append(result_str)

test cases/common/124 test skip/meson.build

@@ -0,0 +1,4 @@
+project('test skip', 'c')
+
+exe_test_skip = executable('test_skip', 'test_skip.c')
+test('test_skip', exe_test_skip)

test cases/common/124 test skip/test_skip.c

@@ -0,0 +1,4 @@
+int main(int argc, char *argv[])
+{
+	return 77;
+}