[glibc] tst-realpath-toolong: return "unsupported" when PATH_MAX is undefined

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cbf4aa422c82b895ab56ef5e9acda37947ad4184

commit cbf4aa422c82b895ab56ef5e9acda37947ad4184
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Thu Aug 3 21:16:16 2023 +0200

    tst-realpath-toolong: return "unsupported" when PATH_MAX is undefined
    
    When PATH_MAX is undefined, realpath cannot ever ENAMETOOLONG, so
    this test is unsupported.

Diff:
---
 stdlib/tst-realpath-toolong.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/stdlib/tst-realpath-toolong.c b/stdlib/tst-realpath-toolong.c
index 4388890294..a071fe7544 100644
--- a/stdlib/tst-realpath-toolong.c
+++ b/stdlib/tst-realpath-toolong.c
@@ -24,18 +24,18 @@
 #include <unistd.h>
 #include <support/check.h>
 #include <support/temp_file.h>
+#include <support/test-driver.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
 #define BASENAME "tst-realpath-toolong."
 
-#ifndef PATH_MAX
-# define PATH_MAX 1024
-#endif
-
 int
 do_test (void)
 {
+#ifndef PATH_MAX
+  return EXIT_UNSUPPORTED;
+#else
   char *base = support_create_and_chdir_toolong_temp_directory (BASENAME);
 
   char buf[PATH_MAX + 1];
@@ -48,6 +48,7 @@ do_test (void)
 
   free (base);
   return 0;
+#endif
 }
 
 #include <support/test-driver.c>