[PATCH, committed 2.38] stdlib: Improve tst-realpath compatibility with source fortification

["Andreas K. Hüttel" <dilfridge@gentoo.org>]

From: Andreas K. Huettel <dilfridge@gentoo.org>

On GCC before 11, IPA can make the fortified realpath aware that the
buffer size is not large enough (8 bytes instead of PATH_MAX bytes).
Fix this by using a buffer that is large enough.

(cherry picked from commit 510fc20d73de12c85823d9996faac74666e9c2e7)
---
 stdlib/tst-realpath.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/stdlib/tst-realpath.c b/stdlib/tst-realpath.c
index f325c95a44..3694ecd8af 100644
--- a/stdlib/tst-realpath.c
+++ b/stdlib/tst-realpath.c
@@ -24,6 +24,7 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <malloc.h>
@@ -50,7 +51,11 @@ void dealloc (void *p)
 
 char* alloc (void)
 {
-  return (char *)malloc (8);
+#ifdef PATH_MAX
+  return (char *)malloc (PATH_MAX);
+#else
+  return (char *)malloc (4096);
+#endif
 }
 
 static int
-- 
2.41.0