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 <eggert@xxxxxxxxxxx>
Date: Fri, 15 Dec 2023 18:21:39 -0800
Subject: [PATCH] Fix AC_FUNC_MMAP on CheriBSD
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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
