* sysdeps/unix/sysv/linux/bits/local_lim.h: Undefined ARG_MAX if

	<linux/limits.h> has defined it.
	* sysdeps/unix/sysv/linux/sys/param.h: Define NCARGS to the legacy
	ARG_MAX value and prevent ARG_MAX from being defined by the kernel
	headers.
	* sysdeps/unix/sysv/linux/sysconf.c: Define legacy_ARG_MAX and use
	it instead of ARG_MAX.

1 files changed, 7 insertions, 2 deletions

diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c
index ab9cddc306..f4e36e0c6f 100644
--- a/sysdeps/unix/sysv/linux/sysconf.c
+++ b/sysdeps/unix/sysv/linux/sysconf.c
@@ -27,6 +27,11 @@
 #include <not-cancel.h>
 #include <ldsodefs.h>
 
+/* Legacy value of ARG_MAX.  The macro is now not defined since the
+   actual value varies based on the stack size.  */
+#define legacy_ARG_MAX 131072
+
+
 static long int posix_sysconf (int name);
 
 
@@ -83,10 +88,10 @@ __sysconf (int name)
 	  /* Use getrlimit to get the stack limit.  */
 	  struct rlimit rlimit;
 	  if (__getrlimit (RLIMIT_STACK, &rlimit) == 0)
-	    return MAX (ARG_MAX, rlimit.rlim_cur / 4);
+	    return MAX (legacy_ARG_MAX, rlimit.rlim_cur / 4);
 	}
 
-      return ARG_MAX;
+      return legacy_ARG_MAX;
 
     case _SC_NGROUPS_MAX:
       /* Try to read the information from the /proc/sys/kernel/ngroups_max