Undefined reference to intel functions

Hi,

When I'm trying to compile my code with optimization options(-On, -fast) i receive this messages:

some_source.cpp:(.text+0x196b): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x199d): undefined reference to `__intel_sse2_strcpy'

some_object.o: In function `SomeFunction(void*)':

some_source.cpp:(.text+0x1c9f): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x1cce): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x1d00): undefined reference to `__intel_sse2_strcpy'

some_source.cpp:(.text+0x1d31): undefined reference to `__intel_sse2_strcat'

some_object.o: In function `SomeFunctionTwo(std::string&)':

some_source.cpp:(.text+0x1ea5): undefined reference to `__intel_sse2_strlen'

some_source.o: In function `CPlatformUtils::IsDirectory(void*)':

some_source.cpp:(.text+0x2836): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x2866): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x289a): undefined reference to `__intel_sse2_strcpy'

some_source.cpp:(.text+0x28cd): undefined reference to `__intel_sse2_strcat'

some_source.o: In function `SomeFunctionThree(void*)':

some_source.cpp:(.text+0x292d): undefined reference to `__intel_sse2_strlen'

some_source.o: In function `SomeFunctionFour(void*&)':

some_source.cpp:(.text+0x2a04): undefined reference to `__intel_sse2_strncpy'

some_source.cpp:(.text+0x2a88): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x2ab6): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x2ae8): undefined reference to `__intel_sse2_strcpy'

some_source.cpp:(.text+0x2b19): undefined reference to `__intel_sse2_strcat'

some_source.o: In function `SomeFunctionFive(std::string const&)':

some_source.cpp:(.text+0x2d83): undefined reference to `__intel_sse2_strlen'

some_source.cpp:(.text+0x2db9): undefined reference to `__intel_sse2_strcpy'

Without optimization it works good. Can anyone explain me this?