Readme: added note about invalid code in release configurations on gcc 9, 10, and 11

Author: TheMostDiligent

README.md

@@ -222,9 +222,12 @@ to build as it will use Visual Studio 2013 (v120) toolset that lacks proper c++1
 ## Linux
 
 Your Linux environment needs to be set up for c++ development. If it already is, make sure your c++ tools are up to date
-as Diligent Engine uses modern c++ features (gcc/g++ or clang 9 or later is recommended). You may need to install the following packages:
+as Diligent Engine uses modern c++ features (clang 10 or later is recommended). You may need to install the following packages:
 
-1. gcc, make and other essential c/c++ tools:
+:warning: gcc 9, 10 and 11 seemingly produce invalid code in release configurations that causes crash on startup.
+Use gcc 7 or 8 or clang.
+
+1. gcc, clang, make and other essential c/c++ tools:
 
 ```
 sudo apt-get update

Troubleshooting.md

@@ -18,6 +18,8 @@ git submodule update --recursive
     If you are not using CMake version bundled with Android Studio, make sure your build files are
     [properly configured](https://developer.android.com/studio/projects/add-native-code.html#use_a_custom_cmake_version).
   * When using gcc, make sure the compiler version is at least 7.4.
+  * gcc 9, 10 and 11 seemingly produce invalid code in release configurations that causes crash on startup.
+    Use gcc 7 or 8 or clang.
   * Make sure you build the project with c++14 features enabled.
 
 * When including Diligent headers, make sure that exactly one of `PLATFORM_WIN32`,