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.

3 files changed, 15 insertions, 3 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)
diff --git a/linden/indra/cmake/LLCommon.cmake b/linden/indra/cmake/LLCommon.cmake
index 410766e..d87d3c0 100644
--- a/linden/indra/cmake/LLCommon.cmake
+++ b/linden/indra/cmake/LLCommon.cmake
@@ -7,9 +7,15 @@ include(ZLIB)
 
 set(LLCOMMON_INCLUDE_DIRS
     ${LIBS_OPEN_DIR}/llcommon
-    ${APRUTIL_INCLUDE_DIR}
     ${APR_INCLUDE_DIR}
     ${Boost_INCLUDE_DIRS}
     )
 
-set(LLCOMMON_LIBRARIES llcommon)
+if (LINUX)
+    # In order to support using ld.gold on linux, we need to explicitely
+    # specify all libraries that llcommon uses.
+    # llcommon uses `clock_gettime' which is provided by librt on linux.
+    set(LLCOMMON_LIBRARIES llcommon rt)
+else (LINUX)
+    set(LLCOMMON_LIBRARIES llcommon)
+endif (LINUX)
diff --git a/linden/indra/llwindow/CMakeLists.txt b/linden/indra/llwindow/CMakeLists.txt
index 5224163..ea81abf 100644
--- a/linden/indra/llwindow/CMakeLists.txt
+++ b/linden/indra/llwindow/CMakeLists.txt
@@ -59,6 +59,7 @@ set(viewer_HEADER_FILES
 set(llwindow_LINK_LIBRARIES
     ${UI_LIBRARIES}     # for GTK
     ${SDL_LIBRARY}
+    fontconfig                  # For FCInit and other FC* functions.
     )
 
 if (DARWIN)