From: Peter Kokot <peterkokot@gmail.com>
Date: Thu, 6 Sep 2018 04:00:14 +0000 (+0200)
Subject: Remove AC_C_CONST
X-Git-Tag: v6.9.1~44^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6b03bf53ebe8bcc035516918de1247dd9fa57bfa;p=onig

Remove AC_C_CONST

Autoconf 2.59d (released in 2006) [1] started promoting several macros
as not relevant for newer systems, including the `AC_C_CONST`.

The `const` keyword is used in C since C89. On old systems some compilers
lacked the `const` and this macro defined it to be empty. This check was
relevant on systems with compilers before C89 and on current systems it
can be omitted since ˙const` is always available. [2]

Refs:
[1] http://git.savannah.gnu.org/cgit/autoconf.git/tree/NEWS
[2] https://www.gnu.org/software/autoconf/manual/autoconf-2.69/autoconf.html
---

diff --git a/configure.ac b/configure.ac
index c39756a..61cfff9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,7 +56,6 @@ dnl Checks for typedefs, structures, and compiler characteristics.
 AC_CHECK_SIZEOF(int, 4)
 AC_CHECK_SIZEOF(short, 2)
 AC_CHECK_SIZEOF(long, 4)
-AC_C_CONST
 
 dnl Checks for library functions.
 AC_FUNC_ALLOCA