From a634aad9e639db7ea204473f2edafc294fb49ca2 Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim.demaille@gmail.com>
Date: Tue, 15 Jan 2019 20:42:18 +0100
Subject: [PATCH] configure: don't try to run C++ warnings on C

Reported by Derek Clegg.
https://lists.gnu.org/archive/html/bison-patches/2019-01/msg00066.html

* configure.ac: here.
---
 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 23aeb86d..a3a471af 100644
--- a/configure.ac
+++ b/configure.ac
@@ -98,9 +98,9 @@ if test "$enable_gcc_warnings" = yes; then
     -fparse-all-comments -Wdocumentation
     -Wformat -Wimplicit-fallthrough -Wnull-dereference
     -Wpointer-arith -Wshadow
-    -Wundefined-func-template -Wwrite-strings'
+    -Wwrite-strings'
   warn_c='-Wbad-function-cast -Wstrict-prototypes'
-  warn_cxx='-Wextra-semi -Wnoexcept'
+  warn_cxx='-Wextra-semi -Wnoexcept -Wundefined-func-template'
   # Warnings for the test suite only.
   #
   # -fno-color-diagnostics: Clang's use of colors in the error