>From 611fa6cd92671318b22e70f931db695a58ecdaf3 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Thu, 13 May 2021 10:49:13 +0200
Subject: [PATCH] Enable more single-thread optimizations in gnulib code.

* configure.ac (GNULIB_REGEX_SINGLE_THREAD, GNULIB_MBRTOWC_SINGLE_THREAD,
GNULIB_WCHAR_SINGLE_LOCALE): Define as C macros.
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 04a7d4b..517666f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,9 @@ gl_ASSERT_NO_GNULIB_POSIXCHECK
 
 # M4 is single-threaded; so we can optimize gnulib code by using this:
 gl_DISABLE_THREADS
+AC_DEFINE([GNULIB_REGEX_SINGLE_THREAD], [1], [Define to optimize regex.])
+AC_DEFINE([GNULIB_MBRTOWC_SINGLE_THREAD], [1], [Define to optimize mbrtowc.])
+AC_DEFINE([GNULIB_WCHAR_SINGLE_LOCALE], [1], [Define to optimize mbrtowc.])
 
 AC_ARG_ENABLE([gcc-warnings],
   [AS_HELP_STRING([--enable-gcc-warnings],
-- 
2.7.4