Fix CMake configuration files to support compiling with older CMake v…

…ersions

CMakeLists.txt

@@ -1,8 +1,6 @@
 cmake_minimum_required(VERSION 3.20)
 project(${SKBUILD_PROJECT_NAME} VERSION ${SKBUILD_PROJECT_VERSION} LANGUAGES C CXX)
 
-cmake_policy(SET CMP0167 NEW)
-
 set(CMAKE_CXX_STANDARD 11)
 set(BUILD_SHARED_LIBS OFF)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)

src/pyfastani/_sequtils/CMakeLists.txt

@@ -5,7 +5,7 @@ if(HAVE_NEON)
     add_library(sequtils_neon neon.c)
     string(STRIP "${NEON_C_FLAGS}" IMPL_FLAGS)
     if(IMPL_FLAGS)
-        target_compile_options(sequtils_neon ${IMPL_FLAGS})
+        target_compile_options(sequtils_neon PRIVATE ${IMPL_FLAGS})
     endif()
     set(PLATFORM_LIBS ${PLATFORM_LIBS} sequtils_neon)
     target_compile_definitions(sequtils PUBLIC NEON_BUILD_SUPPORT)
@@ -14,7 +14,7 @@ if(HAVE_SSE2)
     add_library(sequtils_sse2 sse2.c)
     string(STRIP "${SSE2_C_FLAGS}" IMPL_FLAGS)
     if(IMPL_FLAGS)
-        target_compile_options(sequtils_sse2 ${IMPL_FLAGS})
+        target_compile_options(sequtils_sse2 PRIVATE ${IMPL_FLAGS})
     endif()
     set(PLATFORM_LIBS ${PLATFORM_LIBS} sequtils_sse2)
     target_compile_definitions(sequtils PUBLIC SSE2_BUILD_SUPPORT)
@@ -23,7 +23,7 @@ if(HAVE_SSSE3)
     add_library(sequtils_ssse3 ssse3.c)
     string(STRIP "${SSSE3_C_FLAGS}" IMPL_FLAGS)
     if(IMPL_FLAGS)
-        target_compile_options(sequtils_ssse3 ${IMPL_FLAGS})
+        target_compile_options(sequtils_ssse3 PRIVATE ${IMPL_FLAGS})
     endif()
     set(PLATFORM_LIBS ${PLATFORM_LIBS} sequtils_ssse3)
     target_compile_definitions(sequtils PUBLIC SSSE3_BUILD_SUPPORT)
@@ -34,4 +34,4 @@ endif()
 target_link_libraries(sequtils PUBLIC cpu_features ${PLATFORM_LIBS})
 
 cmake_path(GET CMAKE_CURRENT_LIST_DIR PARENT_PATH PARENT_DIR)
-target_include_directories(sequtils PUBLIC ${PARENT_DIR} ${CMAKE_CURRENT_LIST_DIR})
+target_include_directories(sequtils PUBLIC ${PARENT_DIR} ${CMAKE_CURRENT_LIST_DIR})