From d9332d4a7d9fb6b87568b0fb82fdaeb06ceddd63 Mon Sep 17 00:00:00 2001
From: Leonardo Taccari <iamleot@gmail.com>
Date: Mon, 6 Mar 2017 12:36:34 +0100
Subject: [PATCH] configure: check for AC_FUNC_ALLOCA

Add AC_FUNC_ALLOCA and adjust src/i965_decoder_utils.c to properly include
relevant header files for alloca(3).

Some operating systems does not have <alloca.h> (e.g. NetBSD). This fixes
compilation on such systems.
---
 configure.ac             |  1 +
 src/i965_decoder_utils.c | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 1612993..0ceac64 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,6 +77,7 @@ AC_PROG_CXX
 AC_C_BIGENDIAN
 AC_HEADER_STDC
 AC_SYS_LARGEFILE
+AC_FUNC_ALLOCA
 AC_CHECK_LIB([m], [sin])
 AC_CHECK_FUNCS([log2f])
 AC_CHECK_PROGS([PYTHON2], [python2 python])
diff --git a/src/i965_decoder_utils.c b/src/i965_decoder_utils.c
index 640fd14..a467aee 100644
--- a/src/i965_decoder_utils.c
+++ b/src/i965_decoder_utils.c
@@ -23,7 +23,17 @@
 
 #include "sysdeps.h"
 #include <limits.h>
-#include <alloca.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_ALLOCA_H
+# include <alloca.h>
+#endif
 
 #include "intel_batchbuffer.h"
 #include "intel_media.h"
-- 
2.12.0