From 7d4c8780e566c7e957568bf23bdccf75c1569cb2 Mon Sep 17 00:00:00 2001
From: Florent Castelli <florent.castelli@gmail.com>
Date: Sun, 19 Mar 2017 18:38:04 +0100
Subject: [PATCH] cmake: Fix linking against system Snappy

---
 CMakeLists.txt                 | 2 +-
 cmake/Modules/FindSnappy.cmake | 2 +-
 ext/snappy/CMakeLists.txt      | 8 ++++++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a8dc0e169b..aff0e26b13 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -386,7 +386,7 @@ add_subdirectory(ext)
 include_directories(Common)
 setup_target_project(Common Common)
 
-target_link_libraries(Common Snappy::Snappy)
+target_link_libraries(Common Ext::Snappy)
 
 if(WIN32)
 	include_directories(dx9sdk/Include)
diff --git a/cmake/Modules/FindSnappy.cmake b/cmake/Modules/FindSnappy.cmake
index 312dfb1299..3b906a0a65 100644
--- a/cmake/Modules/FindSnappy.cmake
+++ b/cmake/Modules/FindSnappy.cmake
@@ -58,7 +58,7 @@ mark_as_advanced(
     SNAPPY_LIBRARIES
     SNAPPY_INCLUDE_DIR)
 
-add_library(Snappy::Snappy IMPORTED UNKNOWN GLOBAL)
+add_library(Snappy::Snappy IMPORTED UNKNOWN)
 set_target_properties(Snappy::Snappy PROPERTIES
   IMPORTED_LOCATION "${SNAPPY_LIBRARIES}"
   INTERFACE_INCLUDE_DIRECTORIES "${SNAPPY_INCLUDE_DIR}"
diff --git a/ext/snappy/CMakeLists.txt b/ext/snappy/CMakeLists.txt
index e817f73fef..fb1ed966c4 100644
--- a/ext/snappy/CMakeLists.txt
+++ b/ext/snappy/CMakeLists.txt
@@ -1,6 +1,10 @@
 find_package(Snappy)
 
-if(NOT SNAPPY_FOUND)
+if(SNAPPY_FOUND)
+  add_library(system_snappy INTERFACE)
+  add_library(Ext::Snappy ALIAS system_snappy)
+  target_link_libraries(system_snappy INTERFACE Snappy::Snappy)
+else()
   add_library(snappy STATIC
     snappy-c.cpp
     snappy-c.h
@@ -17,5 +21,5 @@ if(NOT SNAPPY_FOUND)
     target_compile_options(snappy PRIVATE "-O3")
   endif()
 
-  add_library(Snappy::Snappy ALIAS snappy)
+  add_library(Ext::Snappy ALIAS snappy)
 endif()