ht BUGFIX 32-bit system compatibility

XXH3_64bits_withSeed may not be available on some 32-bit systems, so use
XXH32 instead, since the functions return 32bits anyway

Author: Roytak

CMakeLists.txt

@@ -422,6 +422,10 @@ if(XXHASH_FOUND)
     include_directories(${XXHASH_INCLUDE_DIR})
     target_link_libraries(yang ${XXHASH_LIBRARY})
     message(STATUS "Hash algorithm: xxhash")
+    if (HAVE_XXH3_64BITS_WITHSEED)
+        # for 32-bit system compatibility, this may not be available there, so use XXH32 instead
+        add_definitions(-DLY_XXH3_64BITS_WITHSEED)
+    endif()
 else()
     message(STATUS "Hash algorithm: internal Jenkin's one-at-a-time")
 endif()

CMakeModules/FindXXHash.cmake

@@ -34,5 +34,8 @@ find_library(XXHASH_LIBRARY
         ${CMAKE_INSTALL_PREFIX}/lib
 )
 
+# for 32-bit system compatibility
+check_symbol_exists(XXH3_64bits_withSeed ${XXHASH_INCLUDE_DIR}/xxhash.h HAVE_XXH3_64BITS_WITHSEED)
+
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(XXHash FOUND_VAR XXHASH_FOUND REQUIRED_VARS XXHASH_INCLUDE_DIR XXHASH_LIBRARY)

src/hash_table.c

@@ -35,10 +35,17 @@ lyht_hash_multi(uint32_t hash, const char *key_part, size_t len)
 {
 #ifdef LY_XXHASH_SUPPORT
     if (key_part && len) {
+# ifdef LY_XXH3_64BITS_WITHSEED
         return XXH3_64bits_withSeed(key_part, len, hash);
+# else
+        return XXH32(key_part, len, hash);
+# endif
     }
-
+# ifdef LY_XXH3_64BITS_WITHSEED
     return XXH3_64bits_withSeed(NULL, 0, hash);
+# else
+    return XXH32(NULL, 0, hash);
+# endif
 #else
     uint32_t i;
 
@@ -62,7 +69,11 @@ LIBYANG_API_DEF uint32_t
 lyht_hash(const char *key, size_t len)
 {
 #ifdef LY_XXHASH_SUPPORT
+# ifdef LY_XXH3_64BITS_WITHSEED
     return XXH3_64bits(key, len);
+# else
+    return XXH32(key, len, 0);
+# endif
 #else
     uint32_t hash;