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.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ecebdc91bc1802c973e918ffbddb6d98129a7645..5e9c7c860b93ae77a46cdb056819eb05076fc075 100644 (file)
--- 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()