From d00d866e8c56d5a8acf764e34ce04dc54c790ac8 Mon Sep 17 00:00:00 2001
From: Marcus Asteborg <maastebo@microsoft.com>
Date: Wed, 22 Apr 2020 22:42:18 -0700
Subject: [PATCH] cmake - add include guards to cmake files

Signed-off-by: Mark Harris <mark.hsj@gmail.com>
---
 cmake/OpusBuildtype.cmake | 4 ++++
 cmake/OpusConfig.cmake    | 5 +++++
 cmake/OpusFunctions.cmake | 9 ++++-----
 cmake/OpusSources.cmake   | 5 +++++
 4 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/cmake/OpusBuildtype.cmake b/cmake/OpusBuildtype.cmake
index aaee9eff..557cc89b 100644
--- a/cmake/OpusBuildtype.cmake
+++ b/cmake/OpusBuildtype.cmake
@@ -1,4 +1,8 @@
 # Set a default build type if none was specified
+if(__opus_buildtype)
+  return()
+endif()
+set(__opus_buildtype INCLUDED)
 
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   if(CMAKE_C_FLAGS)
diff --git a/cmake/OpusConfig.cmake b/cmake/OpusConfig.cmake
index cb20e7fc..1d0dcccd 100644
--- a/cmake/OpusConfig.cmake
+++ b/cmake/OpusConfig.cmake
@@ -1,3 +1,8 @@
+if(__opus_config)
+  return()
+endif()
+set(__opus_config INCLUDED)
+
 include(OpusFunctions)
 
 configure_file(${CMAKE_SOURCE_DIR}/cmake/config.h.cmake.in config.h @ONLY)
diff --git a/cmake/OpusFunctions.cmake b/cmake/OpusFunctions.cmake
index a3ac1c09..f0da3822 100644
--- a/cmake/OpusFunctions.cmake
+++ b/cmake/OpusFunctions.cmake
@@ -1,8 +1,7 @@
-#[[Cmake helper function to parse source files from make files
-this is to avoid breaking existing make and auto make support
-but still have the option to use CMake with only lists at one place]]
-
-cmake_minimum_required(VERSION 3.1)
+if(__opus_functions)
+  return()
+endif()
+set(__opus_functions INCLUDED)
 
 function(get_library_version OPUS_LIBRARY_VERSION OPUS_LIBRARY_VERSION_MAJOR)
   file(STRINGS configure.ac opus_lt_current_string
diff --git a/cmake/OpusSources.cmake b/cmake/OpusSources.cmake
index d8c6cdf4..01e75d1a 100644
--- a/cmake/OpusSources.cmake
+++ b/cmake/OpusSources.cmake
@@ -1,3 +1,8 @@
+if(__opus_sources)
+  return()
+endif()
+set(__opus_sources INCLUDED)
+
 include(OpusFunctions)
 
 get_opus_sources(SILK_HEAD silk_headers.mk silk_headers)