I'll merge this after I do some testing.
On Mon, Dec 18, 2023, at 2:02 PM, Brooks Davis wrote:
> Thanks! That's basically what I tested by hand on CheriBSD.
>
> -- Brooks
>
> On Fri, Dec 15, 2023 at 06:24:05PM -0800, Paul Eggert wrote:
>> Thanks for the diagnosis. Proposed patch attached. I haven't installed it on
>> Savannah, as Autoconf is currently in a prerelease freeze and Zack wants a
>> look-see at all patches before they go in.
>
>> From 0845c59400378f3441686cbcde48b49fce638f97 Mon Sep 17 00:00:00 2001
>> From: Paul Eggert <egg...@cs.ucla.edu>
>> Date: Fri, 15 Dec 2023 18:21:39 -0800
>> Subject: [PATCH] Fix AC_FUNC_MMAP on CheriBSD
>> MIME-Version: 1.0
>> Content-Type: text/plain; charset=UTF-8
>> Content-Transfer-Encoding: 8bit
>>
>> Problem reported by Brooks Davis in:
>> https://lists.gnu.org/r/autoconf/2023-12/msg00022.html
>> * lib/autoconf/functions.m4: Don???t unmap, since we
>> want to test remapping something already mapped,
>> and unmapping breaks on CheriBSD.
>> ---
>> lib/autoconf/functions.m4 | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
>> index 4cfb5142..9b3f3c02 100644
>> --- a/lib/autoconf/functions.m4
>> +++ b/lib/autoconf/functions.m4
>> @@ -1385,8 +1385,7 @@ main (void)
>> if (*(data2 + i))
>> return 7;
>> close (fd2);
>> - if (munmap (data2, pagesize))
>> - return 8;
>> + /* 'return 8;' not currently used. */
>>
>> /* Next, try to mmap the file at a fixed address which already has
>> something else allocated at it. If we can, also make sure that
>> --
>> 2.43.0
>>
