Add support for using ld.gold on linux.

To use ld.gold configure with:
  -DCMAKE_EXE_LINKER_FLAGS:STRING="-Wl,-use-gold".
ld.gold links the viewer on my machine in 8 seconds, as
opposed to 19 seconds with ld.bfd. Moreover, it uses a
LOT less memory during linking (about 750 MB instead of
2.5 GB!). Thanks to Siana Gearz for pointing out that
ld.gold is so much faster.

1 files changed, 6 insertions, 1 deletions

diff --git a/linden/indra/cmake/BerkeleyDB.cmake b/linden/indra/cmake/BerkeleyDB.cmake
index d98e791..de62763 100644
--- a/linden/indra/cmake/BerkeleyDB.cmake
+++ b/linden/indra/cmake/BerkeleyDB.cmake
@@ -6,6 +6,11 @@ set(DB_FIND_REQUIRED ON)
 if (STANDALONE)
   include(FindBerkeleyDB)
 else (STANDALONE)
-  set(DB_LIBRARIES db-4.2)
+  if (LINUX)
+        # Need to add dependency pthread explicitely to support ld.gold.
+    set(DB_LIBRARIES db-4.2 pthread)
+  else (LINUX)
+    set(DB_LIBRARIES db-4.2)
+  endif (LINUX)
   set(DB_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include)
 endif (STANDALONE)