From 0b974dba2d6b5581ce422ed883209de46f313fb6 Mon Sep 17 00:00:00 2001
From: Andres Freund
Date: Wed, 11 Oct 2017 16:01:52 -0700
Subject: Add configure infrastructure to detect support for C99's restrict.

Will be used in later commits improving performance for a few key
routines where information about aliasing allows for significantly
better code generation.

This allows to use the C99 'restrict' keyword without breaking C89, or
for that matter C++, compilers. If not supported it's defined to be
empty.

Author: Andres Freund
Discussion: https://postgr.es/m/20170914063418.sckdzgjfrsbekae4@alap3.anarazel.de
---
 configure.in | 1 +
 1 file changed, 1 insertion(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index 4548db0dd3c..ab990d69f4c 100644
--- a/configure.in
+++ b/configure.in
@@ -1299,6 +1299,7 @@ fi
 m4_defun([AC_PROG_CC_STDC], []) dnl We don't want that.
 AC_C_BIGENDIAN
 AC_C_INLINE
+AC_C_RESTRICT
 PGAC_PRINTF_ARCHETYPE
 AC_C_FLEXIBLE_ARRAY_MEMBER
 PGAC_C_SIGNED
-- 
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