Re: bootstrap/3163: gcc/aclocal.m4 mmap test fails on UnixWare 7.1.1

[Craig Rodrigues <rodrigc@attbi.com>]

The following reply was made to PR bootstrap/3163; it has been noted by GNATS.

From: Craig Rodrigues <rodrigc@attbi.com>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, john@Calva.COM,
   gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: bootstrap/3163: gcc/aclocal.m4 mmap test fails on UnixWare 7.1.1
Date: Sat, 23 Feb 2002 21:56:20 -0500

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3163
 
 
 john@calva.com posted this info  in PR 3162:
 
 libiberty/aclocal.m4 has a check to see if strncmp runs off the
 end of the string.  It incorrectly fails on systems where
 MAP_ANON(YMOUS) must be used without an open fd, for example
  UnixWare 7.1.1.
 
 --- libiberty/aclocal.m4.orig   Wed Nov 22 09:32:26 2000
 +++ libiberty/aclocal.m4        Wed Jun 13 12:48:35 2001
 @@ -21,8 +21,6 @@
  #ifndef MAP_ANON
  #ifdef MAP_ANONYMOUS
  #define MAP_ANON MAP_ANONYMOUS
 -#else
 -#define MAP_ANON MAP_FILE
  #endif
  #endif
  
 @@ -39,6 +37,10 @@
  {
  #if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
    char *p;
 +#ifdef MAP_ANON
 +  p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
 +                    MAP_ANON|MAP_PRIVATE, -1, 0);
 +#else
    int dev_zero;
  
    dev_zero = open ("/dev/zero", O_RDONLY);
 @@ -46,7 +48,8 @@
      exit (1);
   
    p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
 -                    MAP_ANON|MAP_PRIVATE, dev_zero, 0);
 +                    MAP_FILE|MAP_PRIVATE, dev_zero, 0);
 +#endif
    if (p == (char *)-1)
      exit (2);
    else