Can't compile, Error: invalid numeric argument '/Wextra'

[AncientGrief]

I created a VS 2010 and VS 2015 .sln with CMAKE and tried to compile it. I always get the error:
invalid numeric argument '/Werror'.

I tried removing this block from cmake list:
if(GCC_OR_CLANG) add_definitions(-D__wur=__attribute__\(\(warn_unused_result\)\) -Wall -Werror -fno-exceptions) endif(GCC_OR_CLANG)

Then I get a whole lot of other errors. What's the problem here?!

[ZypherChan]

I have the same problem.You can open the sln property setting and C/C++->Commandline->Other Option.Now you can delete '/Werror'.
The final reason is the CMakeLists "set(GCC_OR_CLANG ((CMAKE_CXX_COMPILER_ID MATCHES "Clang") OR CMAKE_COMPILER_IS_GNUCXX))" doesn't work.
Good luck :)