From: Bruno Haible <bruno@clisp.org>
Date: Sun, 27 Oct 2019 21:01:09 +0000 (+0100)
Subject: Restore ability to use a C++ compiler that does not claim to support C++11.
X-Git-Tag: cln_1-3-5~12
X-Git-Url: https://www.ginac.de/CLN/cln.git//cln.git?a=commitdiff_plain;h=31cf0b0072dad2dc7d8856956a8b16f27a0e9457;p=cln.git

Restore ability to use a C++ compiler that does not claim to support C++11.
---

diff --git a/configure.ac b/configure.ac
index c1a8a59..8a81007 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,7 +90,7 @@ AC_SUBST(CL_VERSION)
 dnl           checks for compiler characteristics
 dnl
 AC_LANG([C++])
-AX_CXX_COMPILE_STDCXX([11])
+AX_CXX_COMPILE_STDCXX([11], [ext], [optional])
 dnl
 CL_LONGLONG
                       dnl DEFS HAVE_LONGLONG