From c26db650a1e93573e4c09d4612ad45ae1e219854 Mon Sep 17 00:00:00 2001
From: Kornel Benko <kornel@lyx.org>
Date: Wed, 29 Sep 2021 17:53:50 +0200
Subject: [PATCH] Cmake build: Fix the invalid test for '-Wno-deprecated-copy'
 flag

The original test was always successfull, even if the flag was invalid.
But checking for '-Wdeprecated-copy' instead yields to error if the warning does not exist.
Existent warning for 'deprecated-copy' implies that 'no-deprecated-copy' also exist.
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ecebdc91bc..5e9c7c860b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -714,7 +714,7 @@ else()
 	# check_cxx_source_compiles("..." HAVE_DEF_MAKE_UNIQUE)
 	include(CheckCXXCompilerFlag)
 	unset(CHECK_WNODEPRECATEDCOPY_FLAG CACHE)
-	CHECK_CXX_COMPILER_FLAG("-Wno-deprecated-copy" CHECK_WNODEPRECATEDCOPY_FLAG)
+	CHECK_CXX_COMPILER_FLAG("-Wdeprecated-copy" CHECK_WNODEPRECATEDCOPY_FLAG)
 	if(${CHECK_WNODEPRECATEDCOPY_FLAG})
 		set(LYX_CXX_FLAGS "-Wall -Wextra -Wno-deprecated-copy ${LYX_GCC11_MODE}${LYX_CXX_FLAGS}")
 	else()