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From 8e7281d7bebb5e389befe6e9a5afbb7b2ae13ae0 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 17 May 2023 11:50:27 -0700
Subject: [PATCH 24/29] Improve AC_FUNC_MMAP comments
* lib/autoconf/functions.m4 (AC_FUNC_MMAP): Add comment.
Upstream-Status: Backport
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
lib/autoconf/functions.m4 | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index 3d6e4aca8..54d04cc38 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -1311,6 +1311,8 @@ AC_CACHE_CHECK([for working mmap], [ac_cv_func_mmap_fixed_mapped],
#include <sys/mman.h>
#ifndef getpagesize
+/* Prefer sysconf to the legacy getpagesize function, as getpagesize has
+ been removed from POSIX and is limited to page sizes that fit in 'int'. */
# ifdef _SC_PAGESIZE
# define getpagesize() sysconf (_SC_PAGESIZE)
# elif defined _SC_PAGE_SIZE
--
2.41.0
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