From 8387df1551f18b90b3936c7cbb311416c3db8032 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Sat, 4 Feb 2023 17:34:08 +0100
Subject: Annotate functions with access attribute

Supported by GCC since version 10.
---
 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 73a8e91c..015f9046 100644
--- a/configure.ac
+++ b/configure.ac
@@ -188,6 +188,20 @@ AC_COMPILE_IFELSE([
    AC_MSG_RESULT(no))
 CFLAGS="$old_CFLAGS"
 
+AC_MSG_CHECKING(for access)
+old_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Wno-error -Werror=attributes"
+AC_COMPILE_IFELSE([
+   AC_LANG_SOURCE(
+      [
+         __attribute__((access(read_only, 1, 2))) extern int foo(const char* str, unsigned len);
+      ],[]
+   )],
+   AC_DEFINE([HAVE_ATTR_ACCESS], 1, [The access attribute is supported.])
+   AC_MSG_RESULT(yes),
+   AC_MSG_RESULT(no))
+CFLAGS="$old_CFLAGS"
+
 AC_MSG_CHECKING(for NaN support)
 AC_RUN_IFELSE([
    AC_LANG_PROGRAM(
-- 
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