From 44d1200ca47d1ffb5b20a9da183b1e0b25bfb8f7 Mon Sep 17 00:00:00 2001
From: Benny Baumann <BenBE@geshi.org>
Date: Sun, 27 Jun 2021 12:44:01 +0200
Subject: Check for alloc_size attribute in configure.ac

---
 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 8431242f..e9900e75 100644
--- a/configure.ac
+++ b/configure.ac
@@ -173,6 +173,20 @@ AC_TYPE_UINT16_T
 AC_TYPE_UINT32_T
 AC_TYPE_UINT64_T
 
+AC_MSG_CHECKING(for alloc_size)
+old_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Wno-error -Werror=attributes"
+AC_COMPILE_IFELSE([
+   AC_LANG_SOURCE(
+      [
+         __attribute__((alloc_size(1))) char* my_alloc(int size) { return 0; }
+      ],[]
+   )],
+   AC_DEFINE([HAVE_ATTR_ALLOC_SIZE], 1, [The alloc_size attribute is supported.])
+   AC_MSG_RESULT(yes),
+   AC_MSG_RESULT(no))
+CFLAGS="$old_CFLAGS"
+
 # ----------------------------------------------------------------------
 
 
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