From d7c3cd215f25380cd5db1e93ac549bbb441c60c5 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Tue, 11 Sep 2018 02:01:31 +0300
Subject: Add -Wvla flag into configure.

This flag prevent usage of variable length arrays.
---
 configure    | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 configure.ac |  1 +
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 4f85787af..7296be978 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac 8f7af789e.
+# From configure.ac 150dff284.
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.69.
 #
@@ -7585,6 +7585,55 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
 
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wvla" >&5
+$as_echo_n "checking whether $CC supports -Wvla... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wvla"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wvla"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wvla" >&5
+$as_echo_n "checking whether $CC can actually use -Wvla... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wvla"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wvla"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wno-format-nonliteral" >&5
 $as_echo_n "checking whether $CC supports -Wno-format-nonliteral... " >&6; }
 		OLD_CFLAGS="$CFLAGS"
diff --git a/configure.ac b/configure.ac
index 4d5f4bcfd..2aad9d7e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1085,6 +1085,7 @@ AC_CHECK_COMPILER_WFLAG(redundant-decls)
 AC_CHECK_COMPILER_WFLAG(cast-qual)
 AC_CHECK_COMPILER_WFLAG(misleading-indentation)
 AC_CHECK_COMPILER_WFLAG(null-dereference)
+AC_CHECK_COMPILER_WFLAG(vla)
 AC_CHECK_COMPILER_WNOFLAG(format-nonliteral)
 AC_CHECK_COMPILER_WNOFLAG(switch)
 AC_CHECK_COMPILER_WNOFLAG(missing-field-initializers)
-- 
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