lib/drmtest: add igt_assert as a replacement for assert

The aim is that we keep on running subtests even when a not-too-lethal
assert failed in a subtest. To make that useful also print per-subtest
test results from igt_skip|fail|success functions.

If required we can always go googletest-nuts with different types of
asserts later on, but I think for now we're good with what we have
here.

v2: Also print out proper SKIP message when skipping all subsequent
tests since a global (i.e. outside of a subtest) init step failed and
resulted in an igt_skip call.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/drmtest.h

@@ -106,7 +106,11 @@ bool igt_only_list_subtests(void);
 void igt_skip(void);
 void igt_success(void);
 void igt_fail(int exitcode) __attribute__((noreturn));
+void __igt_fail_assert(int exitcode, const char *file,
+		       const int line, const char *func, const char *assertion)
+	__attribute__((noreturn));
 void igt_exit(void);
+#define igt_assert(expr) do { if (!(expr)) __igt_fail_assert(99, __FILE__, __LINE__, __func__, #expr ); } while (0)
 
 /* check functions which auto-skip tests by calling igt_skip() */
 void gem_check_caching(int fd);