From 7f61736f4a3cf7f50707ff66617e31318124df17 Mon Sep 17 00:00:00 2001
From: Gudmundur Adalsteinsson <ofpgummi@yahoo.com>
Date: Fri, 20 Dec 2024 11:26:46 +0000
Subject: [PATCH] Only set C++ standard if not defined

This allows us use `add_subdirectory(avcpp)` without overwriting the set standard (C++23 e.g.)
---
 CMakeLists.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51665045..9ee3bf6b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,8 +16,10 @@ set(AV_ENABLE_STATIC On CACHE BOOL "Enable static library build (On)")
 set(AV_ENABLE_SHARED On CACHE BOOL "Enable shared library build (On)")
 set(AV_BUILD_EXAMPLES On CACHE BOOL "Build example applications (On)")
 
-# Compiler-specific C++11 activation.
-set(CMAKE_CXX_STANDARD 17)
+# Compiler-specific C++17 activation.
+if(NOT DEFINED CMAKE_CXX_STANDARD)
+    set(CMAKE_CXX_STANDARD 17)
+endif()
 set(CMAKE_CXX_STANDARD_REQUIRED yes)
 
 # Warnings