From 72f1ffca315378465b2aa83dd399f8a4f026c59c Mon Sep 17 00:00:00 2001
From: Brendan Le Foll <brendan.le.foll@intel.com>
Date: Thu, 12 Apr 2018 15:37:05 +0200
Subject: [PATCH] cmake: force c99 to be set in the compiler

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
Signed-off-by: malikabhi05 <abhishek.malik@intel.com>
---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa75a8b..e98534b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,14 @@ project (mraa C CXX)
 
 FIND_PACKAGE (Threads REQUIRED)
 
+if (CMAKE_VERSION VERSION_LESS "3.1")
+  if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    set (CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
+  endif ()
+else ()
+  set (CMAKE_C_STANDARD 99)
+endif ()
+
 ###############################################################################
 # Detect supported warning flags
 # Modified from work By Dan Liew (fpbench - MIT)