+function(add_cflag_if_supported flag)
+ string(REPLACE "-" "_" flagclean ${flag})
+ string(REPLACE "=" "_" flagclean ${flagclean})
+ string(REPLACE "+" "_" flagclean ${flagclean})
+ string(REPLACE "," "_" flagclean ${flagclean})
+ string(TOUPPER ${flagclean} flagclean)
+
+ check_c_compiler_flag(${flag} C_SUPPORTS${flagclean})
+
+ if (C_SUPPORTS${flagclean})
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
+ endif()
+endfunction()
+
+add_cflag_if_supported("-std=gnu99")
+add_cflag_if_supported("-Wall")
+add_cflag_if_supported("-Wextra")
+add_cflag_if_supported("-Wshadow")
+add_cflag_if_supported("-D_FORTIFY_SOURCE=2")
+add_cflag_if_supported("-fstrict-aliasing")
+add_cflag_if_supported("-Wformat")
+add_cflag_if_supported("-Wformat-security")
+add_cflag_if_supported("-Wmaybe-uninitialized")
+add_cflag_if_supported("-Wmissing-variable-declarations")
+add_cflag_if_supported("-Wshorten-64-to-32")
+add_cflag_if_supported("-Wimplicit-function-declaration")
+add_cflag_if_supported("-Wredundant-decls")
+add_cflag_if_supported("-Wundef")
+add_cflag_if_supported("-fPIC")
+
+if(${CMAKE_BUILD_TYPE} MATCHES "Debug")
+ include(CTest)
+ add_cflag_if_supported("-ggdb")
+ add_cflag_if_supported("-O0")
+elseif()
+ add_cflag_if_supported("-O2")
+endif()