From d6ca2b0fc5e9f12fe8e8509ac7c334b947858591 Mon Sep 17 00:00:00 2001
From: Steve Markgraf <steve@steve-m.de>
Date: Mon, 2 Mar 2020 21:11:40 +0100
Subject: [PATCH] Fix for CMake < 3.12.0

As several current LTS distributions currently ship with CMake
< 3.12.0, add a work-around for CMake Issue 16967.

Otherwise we get:
CMake Error at
/usr/share/cmake-3.7/Modules/CheckCXXSourceCompiles.cmake:64 (try_compile):
   Unknown extension ".cxx" for file

     /tmp/rtl-sdr/build/CMakeFiles/CMakeTmp/src.cxx

   try_compile() works only for enabled languages.  Currently these are:

     C
---
 CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 419908a..2def354 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,13 @@
 # Project setup
 ########################################################################
 cmake_minimum_required(VERSION 3.7.2)
-project(rtlsdr C)
+
+# workaround for https://gitlab.kitware.com/cmake/cmake/issues/16967
+if(${CMAKE_VERSION} VERSION_LESS "3.12.0")
+    project(rtlsdr)
+else()
+    project(rtlsdr C)
+endif()
 
 #select the release build type by default to get optimization flags
 if(NOT CMAKE_BUILD_TYPE)