CMake: Set LIBS on llvm-config so we can query the system libraries

used by CMake with --ldflags.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72470 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 23 insertions, 10 deletions

diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 1f0ff74..c531298 100755
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -30,17 +30,11 @@ macro(add_llvm_executable name)
     target_link_libraries(${name} ${llvm_libs})
   else( MSVC )
     add_dependencies(${name} llvm-config.target)
-    if( MINGW )
-      target_link_libraries(${name} imagehlp psapi)
-    elseif( CMAKE_HOST_UNIX )
-      if( HAVE_LIBDL )
-	target_link_libraries(${name} dl)
-      endif()
-      if( LLVM_ENABLE_THREADS AND HAVE_LIBPTHREAD )
-	target_link_libraries(${name} pthread)
-      endif()
-    endif( MINGW )
   endif( MSVC )
+  get_system_libs(llvm_system_libs)
+  if( llvm_system_libs )
+    target_link_libraries(${name} ${llvm_system_libs})
+  endif()
 endmacro(add_llvm_executable name)
 
 
diff --git a/cmake/modules/LLVMConfig.cmake b/cmake/modules/LLVMConfig.cmake
index 63f9ded..9776fb0 100755
--- a/cmake/modules/LLVMConfig.cmake
+++ b/cmake/modules/LLVMConfig.cmake
@@ -1,5 +1,24 @@
 include(FindPerl)
 
+
+function(get_system_libs return_var)
+  # Returns in `return_var' a list of system libraries used by LLVM.
+  if( NOT MSVC )
+    if( MINGW )
+      set(system_libs ${system_libs} imagehlp psapi)
+    elseif( CMAKE_HOST_UNIX )
+      if( HAVE_LIBDL )
+	set(system_libs ${system_libs} dl)
+      endif()
+      if( LLVM_ENABLE_THREADS AND HAVE_LIBPTHREAD )
+	set(system_libs ${system_libs} pthread)
+      endif()
+    endif( MINGW )
+  endif( NOT MSVC )
+  set(${return_var} ${system_libs} PARENT_SCOPE)
+endfunction(get_system_libs)
+
+
 macro(llvm_config executable)
   # extra args is the list of link components.
   if( MSVC )