[PATCH] libcxxabi must link to dl if using bundled unwind

[İsmail Dönmez]

Hi danalbert,

Hi,

src/Unwind/AddressSpace.hpp uses dladdr symbol which is defined in dl library. 
Attached patch adds support for linking to dl library for CMake build system.

Please have a look. Thanks.

http://reviews.llvm.org/D4953

Files:
  libcxxabi/cmake/config-ix.cmake
  libcxxabi/src/Unwind/CMakeLists.txt

Index: libcxxabi/cmake/config-ix.cmake
===================================================================
--- libcxxabi/cmake/config-ix.cmake
+++ libcxxabi/cmake/config-ix.cmake
@@ -35,5 +35,6 @@
 
 # Check libraries
 check_library_exists(c printf "" LIBCXXABI_HAS_C_LIB)
+check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB)
 check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB)
 check_library_exists(gcc_eh _Unwind_GetRegionStart "" LIBCXXABI_HAS_GCC_EH_LIB)
Index: libcxxabi/src/Unwind/CMakeLists.txt
===================================================================
--- libcxxabi/src/Unwind/CMakeLists.txt
+++ libcxxabi/src/Unwind/CMakeLists.txt
@@ -59,6 +59,7 @@
 # Generate library list.
 set(libraries ${LIBCXXABI_CXX_ABI_LIBRARIES})
 append_if(libraries LIBCXXABI_HAS_C_LIB c)
+append_if(libraries LIBCXXABI_HAS_DL_LIB dl)
 append_if(libraries LIBCXXABI_HAS_PTHREAD_LIB pthread)
 
 target_link_libraries(unwind ${libraries})

Index: libcxxabi/cmake/config-ix.cmake
===================================================================
--- libcxxabi/cmake/config-ix.cmake
+++ libcxxabi/cmake/config-ix.cmake
@@ -35,5 +35,6 @@
 
 # Check libraries
 check_library_exists(c printf "" LIBCXXABI_HAS_C_LIB)
+check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB)
 check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB)
 check_library_exists(gcc_eh _Unwind_GetRegionStart "" LIBCXXABI_HAS_GCC_EH_LIB)
Index: libcxxabi/src/Unwind/CMakeLists.txt
===================================================================
--- libcxxabi/src/Unwind/CMakeLists.txt
+++ libcxxabi/src/Unwind/CMakeLists.txt
@@ -59,6 +59,7 @@
 # Generate library list.
 set(libraries ${LIBCXXABI_CXX_ABI_LIBRARIES})
 append_if(libraries LIBCXXABI_HAS_C_LIB c)
+append_if(libraries LIBCXXABI_HAS_DL_LIB dl)
 append_if(libraries LIBCXXABI_HAS_PTHREAD_LIB pthread)
 
 target_link_libraries(unwind ${libraries})

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