From mboxrd@z Thu Jan  1 00:00:00 1970
From: john@Calva.COM
To: gcc-gnats@gcc.gnu.org
Subject: bootstrap/3163: gcc/aclocal.m4 mmap test fails on UnixWare 7.1.1
Date: Wed, 13 Jun 2001 04:46:00 -0000
Message-id: <200106131137.f5DBb1x26822@oceanic.CalvaEDI.COM>
X-SW-Source: 2001-06/msg00553.html
List-Id: <gcc-prs.sourceware.org>

>Number:         3163
>Category:       bootstrap
>Synopsis:       gcc/aclocal.m4 mmap test fails on UnixWare 7.1.1
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 13 04:46:05 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     John Hughes
>Release:        3.0 20010611 (prerelease)
>Organization:
CalvaEDI S.A.
>Environment:
System: UnixWare oceanic 5 7.1.1 i386 x86at SCO UNIX_SVR5


	
host: i586-sco-sysv5uw7.1.1
build: i586-sco-sysv5uw7.1.1
target: i586-sco-sysv5uw7.1.1
configured with: ../gcc-3.0-20010611/configure --prefix=/u/local --with-local_prefix=/u/local
>Description:
	To quote gcc/aclocal.m4:

/* 3. If we map two adjacent 1-page regions and unmap them both with
   one munmap, both must go away.

   Getting two adjacent 1-page regions with two mmap calls is slightly
   tricky.  All OS's tested skip over already-allocated blocks; therefore
   we have been careful to unmap all allocated regions in previous tests.
   HP/UX allocates pages backward in memory.  No OS has yet been observed
   to be so perverse as to leave unmapped space between consecutive calls
   to mmap.  */

Well, UnixWare 7.1.1 is that perverse system.  It seems to leave
one page between each mapping.

>How-To-Repeat:
	configure
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: