From 6c6c23c5a1a18826abd9cfe64a68f9c058e5c704 Mon Sep 17 00:00:00 2001
From: Berkus Decker <berkus@madfire.net>
Date: Mon, 18 Dec 2017 02:44:22 +0200
Subject: [PATCH] Set flag only if supported by the compiler

---
 CMakeLists.txt          | 8 ++++++++
 Telegram/CMakeLists.txt | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa8403e88..7a6f2140a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,14 @@ if (UNIX AND NOT APPLE)
     set(LINUX 1)
 endif()
 
+function(set_flag_if_supported target shortname flag)
+    include(CheckCXXCompilerFlag)
+    check_cxx_compiler_flag(${flag} ${shortname}_FLAG_SUPPORTED)
+    if (${shortname}_FLAG_SUPPORTED)
+        target_compile_options(${target} PRIVATE ${flag})
+    endif()
+endfunction()
+
 ##================================================
 ## Configure packages
 ##================================================
diff --git a/Telegram/CMakeLists.txt b/Telegram/CMakeLists.txt
index aed929ccf..e122a6599 100644
--- a/Telegram/CMakeLists.txt
+++ b/Telegram/CMakeLists.txt
@@ -620,7 +620,7 @@ endif()
 
 # Disable a single annoying warning about c++17
 if(NOT WIN32)
-    target_compile_options(Telegram PRIVATE -Wno-c++1z-extensions)
+    set_flag_if_supported(Telegram WNCE -Wno-c++1z-extensions)
 endif()
 
 # Enable C++14 support for msvc (@todo this should be done in cmake - see ver 3.10 or above)