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[bug #19391] assertion failure on aix in xargs.c line 447

From: Michael Haubenwallner
Subject: [bug #19391] assertion failure on aix in xargs.c line 447
Date: Fri, 23 Mar 2007 15:01:13 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20061030 Firefox/


                 Summary: assertion failure on aix in xargs.c line 447
                 Project: findutils
            Submitted by: haubi
            Submitted on: Friday 03/23/2007 at 15:01
                Category: xargs
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.3.2
           Fixed Release: None



When running xargs on aix, this assertion in xargs.x#447 fails:

446 #if defined(ARG_MAX)
447       assert(bc_ctl.arg_max <= (ARG_MAX-2048));
448 #endif

As ARG_MAX can be modified (it is an aix kernel parameter), there is no
meaning to have ARG_MAX defined as preprocessor constant.

In aix5.3 headers, there's a comment:

    /* The following values will be undefined if the system supports a value
       is equal or greater than the stated minimum AND the supported value
       indeterminate (e.g. dependent on memory space).
       On AIX, this includes ARG_MAX and CHILD_MAX.  (But if _ALL_SOURCE is
       used, these are defined with their default values).

Note the last sentence in parents.

So there come a few ways around that to my mind:

1) in xargs.c: ignore ARG_MAX on aix
2) in config.h.in: put "#if 0 ... #endif" around _ALL_SOURCE
3) in configure.in: do not use 'AC_AIX', which defines _ALL_SOURCE

But for 2) and 3), one out of _XOPEN_SOURCE, _POSIX_SOURCE or _ANSI_C_SOURCE
needs to be defined to prevent /usr/include/standars.h from defining
So as the easiest (best?) way I'd suggest 1):

-#if defined(ARG_MAX)
+#if defined(ARG_MAX) && !defined(_AIX)


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