$NetBSD: patch-tools_llvm-shlib_CMakeLists.txt,v 1.6 2019/10/19 13:52:40 adam Exp $

Use the Linux style linking everywhere except Darwin and SunOS.

--- tools/llvm-shlib/CMakeLists.txt.orig	2019-08-29 08:58:14.000000000 +0000
+++ tools/llvm-shlib/CMakeLists.txt
@@ -45,13 +45,11 @@ if(LLVM_BUILD_LLVM_DYLIB)
   add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB SONAME ${INSTALL_WITH_TOOLCHAIN} ${SOURCES})
 
   list(REMOVE_DUPLICATES LIB_NAMES)
-  if(("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux") OR (MINGW) OR (HAIKU)
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "FreeBSD")
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "GNU")
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "OpenBSD")
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "Fuchsia")
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "DragonFly")
-     OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS")) # FIXME: It should be "GNU ld for elf"
+  if("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS")
+    set(LIB_NAMES -Wl,-Bsymbolic -Wl,-z -Wl,allextract ${LIB_NAMES} -Wl,-z -Wl,defaultextract)
+  elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
+    set(LIB_NAMES -Wl,-all_load ${LIB_NAMES})
+  else()
     configure_file(
     ${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in
     ${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map)
@@ -62,8 +60,6 @@ if(LLVM_BUILD_LLVM_DYLIB)
       # Solaris ld does not accept global: *; so there is no way to version *all* global symbols
       set(LIB_NAMES -Wl,--version-script,${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map ${LIB_NAMES})
     endif()
-  elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
-    set(LIB_NAMES -Wl,-all_load ${LIB_NAMES})
   endif()
 
   target_link_libraries(LLVM PRIVATE ${LIB_NAMES})