$NetBSD: patch-tools_libclang_CMakeLists.txt,v 1.2 2022/01/14 08:58:48 tm Exp $

Only the linker on Solaris 11.4 supports GNU ld version script and only if
the special option gnu-version-script-compat is used. Older Solaris linker
doesn't support version script.

--- tools/libclang/CMakeLists.txt.orig	2021-09-24 16:18:10.000000000 +0000
+++ tools/libclang/CMakeLists.txt
@@ -167,11 +167,21 @@ if(ENABLE_SHARED)
     endif()
   endif()
   if (USE_VERSION_SCRIPT)
-    target_link_options(libclang PRIVATE "-Wl,--version-script,${CMAKE_CURRENT_SOURCE_DIR}/libclang.map")
-    # The Solaris 11.4 linker supports a subset of GNU ld version scripts,
-    # but requires a special option to enable it.
     if (${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
-      target_link_options(libclang PRIVATE "-Wl,-z,gnu-version-script-compat")
+      include(CheckLinkerFlag)
+      # The Solaris 11.4 linker supports a subset of GNU ld version scripts,
+      # but requires a special option to enable it.
+      llvm_check_linker_flag(CXX "-Wl,-z,gnu-version-script-compat" LINKER_SUPPORTS_Z_GNU_VERSION_SCRIPT_COMPAT)
+      # Older Solaris (and illumos) linker doesn't support GNU ld version 
+      # and doesn't support GNU version script compat.
+      if (LINKER_SUPPORTS_Z_GNU_VERSION_SCRIPT_COMPAT)
+	target_link_options(libclang PRIVATE "-Wl,--version-script,${CMAKE_CURRENT_SOURCE_DIR}/libclang.map")
+	target_link_options(libclang PRIVATE "-Wl,-z,gnu-version-script-compat")
+      else()
+        target_link_options(libclang PRIVATE "-Wl,-M,${CMAKE_CURRENT_SOURCE_DIR}/libclang.map")
+      endif()
+    else() 
+      target_link_options(libclang PRIVATE "-Wl,--version-script,${CMAKE_CURRENT_SOURCE_DIR}/libclang.map")
     endif()
     # Ensure that libclang.so gets rebuilt when the linker script changes.
     set_property(SOURCE ARCMigrate.cpp APPEND PROPERTY