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if(CMAKE_COMPILER_IS_GNUCXX)
include(CheckCXXCompilerFlag)
# Addtional warnings for GCC
set(CMAKE_CXX_FLAGS_WARN "-Wnon-virtual-dtor -Wno-long-long -ansi -Wcast-align -Wchar-subscripts -Wall -Wextra -Wpointer-arith -Wformat-security -Woverloaded-virtual -Wshadow -Wunused-parameter -fno-check-new -fno-common")
# This flag is useful as not returning from a non-void function is an error
# with MSVC, but it is not supported on all GCC compiler versions
check_cxx_compiler_flag(-Werror=return-type HAVE_GCC_ERROR_RETURN_TYPE)
if(HAVE_GCC_ERROR_RETURN_TYPE)
set(CMAKE_CXX_FLAGS_ERROR "-Werror=return-type")
endif()
# If we are compiling on Linux then set some extra linker flags too
if(CMAKE_SYSTEM_NAME MATCHES Linux)
set(CMAKE_SHARED_LINKER_FLAGS
"-Wl,--no-undefined -lc ${CMAKE_SHARED_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS
"-Wl,--no-undefined -lc ${CMAKE_MODULE_LINKER_FLAGS}")
set (CMAKE_EXE_LINKER_FLAGS
"-Wl,--no-undefined -lc ${CMAKE_EXE_LINKER_FLAGS}")
endif()
# Set up the debug CXX_FLAGS for extra warnings
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO
"${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${CMAKE_CXX_FLAGS_WARN}")
set(CMAKE_CXX_FLAGS_DEBUG
"${CMAKE_CXX_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS_WARN} ${CMAKE_CXX_FLAGS_ERROR}")
endif()
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