[gjs/wip/ptomato/mozjs31prep: 3/8] build: Require C++11

[Philip Chimento <pchimento src gnome org>]

commit e63082b68d6641f04cd8bca2b6aa658e48143f9f
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Sep 3 12:11:42 2016 -0700

    build: Require C++11
    
    This was already required in practice, as the mozjs24 headers included
    C++11 features. Probably this was not noticed because GCC did not warn
    about that, but Clang does.

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9148550..66d0d3b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,6 +29,7 @@ PKG_PROG_PKG_CONFIG
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_CXX
+AX_CXX_COMPILE_STDCXX_11
 AC_ISC_POSIX
 AC_HEADER_STDC