cmake: Link with --undefined-version

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 3.18)
 
 file(STRINGS "configure.ac" CONFIGURE_AC_LINES)
 foreach(line ${CONFIGURE_AC_LINES})
@@ -16,6 +16,7 @@ include(CheckCSourceCompiles)
 include(CheckFunctionExists)
 include(CheckIncludeFiles)
 include(CheckLibraryExists)
+include(CheckLinkerFlag)
 include(CheckStructHasMember)
 include(CheckSymbolExists)
 include(CMakePackageConfigHelpers)
@@ -337,7 +338,11 @@ if(CMAKE_C_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID STREQUAL "GNU")
 -Wredundant-decls -Wno-long-long -Wno-format-extra-args")
 
 	if(BUILD_SHARED_LIBS AND UNIX AND NOT APPLE)
-		target_link_options(LibXml2 PRIVATE "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libxml2.syms")
+		check_linker_flag(C "LINKER:--undefined-version" FLAG_UNDEFINED_VERSION)
+		if (FLAG_UNDEFINED_VERSION)
+			target_link_options(LibXml2 PRIVATE "LINKER:--undefined-version")
+		endif()
+		target_link_options(LibXml2 PRIVATE "LINKER:--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libxml2.syms")
 	endif()
 endif()