[PATCH] testsuite: Make stdio-common/tst-printf-format-*-mem UNSUPPORTED if the mtrace output does not exist

[Xi Ruoyao]

When gawk was not built with MPFR, there's no mtrace output and those
tests FAIL.  But we should make them UNSUPPORTED like other
tst-printf-format-* tests in the case.

Signed-off-by: Xi Ruoyao <xry111@xry111.site>
---
 stdio-common/Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index bbdc1ff709..840289afd9 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -599,8 +599,11 @@ $(objpfx)tst-%-mem.out: $(objpfx)tst-%.out
 	$(common-objpfx)malloc/mtrace $(objpfx)tst-$*.mtrace > $@; \
 	$(evaluate-test)
 $(objpfx)tst-printf-format-%-mem.out: $(objpfx)tst-printf-format-%.out
-	$(common-objpfx)malloc/mtrace \
-	  $(objpfx)tst-printf-format-$*.mtrace > $@; \
+	{ test -r $(objpfx)tst-printf-format-$*.mtrace \
+	|| ( echo "$(objpfx)tst-printf-format-$*.mtrace does not exist"; \
+	     exit 77; ) \
+	&& $(common-objpfx)malloc/mtrace \
+	  $(objpfx)tst-printf-format-$*.mtrace; } > $@; \
 	$(evaluate-test)
 
 errlist-h = $(firstword $(wildcard $(addsuffix /errlist.h,$(sysdirs) .)))
-- 
2.48.1