[PATCH] math: Fix unsupported check in test-narrowing-trap

---

Base commit: af51ed63d0

Test change only. Passes regression on aarch64-linux-gnu,
x86_64-linux-gnu, i686-linux-gnu and build-tested for
several targets with build-many-glibcs.py.

Andreas, I suppose we could merge this test fix now? It's OK if not.

---
 math/test-narrowing-trap.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/math/test-narrowing-trap.c b/math/test-narrowing-trap.c
index 6d21357913..5820de42ad 100644
--- a/math/test-narrowing-trap.c
+++ b/math/test-narrowing-trap.c
@@ -22,6 +22,7 @@
 #include <stdlib.h>
 #include <support/check.h>
 #include <support/xunistd.h>
+#include <support/test-driver.h>
 
 static int
 do_test (void)
@@ -29,14 +30,14 @@ do_test (void)
 #ifdef FE_INVALID
   pid_t pid;
 
-  if (!EXCEPTION_ENABLE_SUPPORTED (FE_INVALID))
-    FAIL_UNSUPPORTED ("feenableexcept (FE_INVALID) not supported");
-
   pid = xfork ();
   if (pid == 0)
     {
       int r = feenableexcept (FE_INVALID);
 
+      if (!EXCEPTION_ENABLE_SUPPORTED (FE_INVALID) && r == -1)
+        FAIL_UNSUPPORTED ("feenableexcept (FE_INVALID) not supported");
+
       TEST_COMPARE (r, 0);
       fdiv (0.0, 0.0);
       _exit (0);
@@ -46,6 +47,9 @@ do_test (void)
       int status;
       xwaitpid (pid, &status, 0);
 
+      if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
+        FAIL_UNSUPPORTED ("feenableexcept (FE_INVALID) not supported");
+
       TEST_VERIFY (WIFSIGNALED (status));
       TEST_COMPARE (WTERMSIG (status), SIGFPE);
     }
-- 
2.47.3