Replace gtest with sytem version

.travis.yml

@@ -41,6 +41,6 @@ before_install:
   - sudo add-apt-repository ppa:libreoffice/ppa -y
   - sudo apt-get update -d
 install:
-  - sudo apt-get install libvtk5-qt4-dev libflann-dev libeigen3-dev libopenni-dev libqhull-dev libboost-filesystem1.53-dev libboost-iostreams1.53-dev libboost-thread1.53-dev libboost-chrono1.53-dev libusb-1.0-0-dev
+  - sudo apt-get install libvtk5-qt4-dev libflann-dev libeigen3-dev libopenni-dev libqhull-dev libboost-filesystem1.53-dev libboost-iostreams1.53-dev libboost-thread1.53-dev libboost-chrono1.53-dev libusb-1.0-0-dev libgtest-dev
 script:
   - bash .travis.sh

cmake/Modules/FindGtest.cmake

@@ -0,0 +1,40 @@
+###############################################################################
+# Find GTest
+#
+# This sets the following variables:
+# GTEST_FOUND - True if GTest was found.
+# GTEST_INCLUDE_DIRS - Directories containing the GTest include files.
+# GTEST_SRC - Directories containing the GTest source files.
+
+if(CMAKE_SYSTEM_NAME STREQUAL Linux)
+    set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} /usr /usr/local)
+endif(CMAKE_SYSTEM_NAME STREQUAL Linux)
+if(APPLE)
+  list(APPEND CMAKE_INCLUDE_PATH /opt/local)
+  set(CMAKE_FIND_FRAMEWORK NEVER)
+endif()
+
+find_path(GTEST_INCLUDE_DIR gtest/gtest.h
+    HINTS "${GTEST_ROOT}" "$ENV{GTEST_ROOT}"
+    PATHS "$ENV{PROGRAMFILES}/gtest" "$ENV{PROGRAMW6432}/gtest"
+    PATHS "$ENV{PROGRAMFILES}/gtest-1.7.0" "$ENV{PROGRAMW6432}/gtest-1.7.0"
+    PATH_SUFFIXES gtest include/gtest include)
+
+find_path(GTEST_SRC_DIR src/gtest-all.cc
+    HINTS "${GTEST_ROOT}" "$ENV{GTEST_ROOT}"
+    PATHS "$ENV{PROGRAMFILES}/gtest" "$ENV{PROGRAMW6432}/gtest"
+    PATHS "$ENV{PROGRAMFILES}/gtest-1.7.0" "$ENV{PROGRAMW6432}/gtest-1.7.0"
+    PATH /usr/src/gtest
+    PATH_SUFFIXES gtest usr/src/gtest)
+
+set(GTEST_INCLUDE_DIRS ${GTEST_INCLUDE_DIR})
+set(CMAKE_FIND_FRAMEWORK)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Gtest DEFAULT_MSG GTEST_INCLUDE_DIR GTEST_SRC_DIR)
+
+mark_as_advanced(GTEST_INCLUDE_DIR GTEST_SRC_DIR)
+
+if(GTEST_FOUND)
+  message(STATUS "GTest found (include: ${GTEST_INCLUDE_DIRS}, src: ${GTEST_SRC_DIR})")
+endif(GTEST_FOUND)

test/CMakeLists.txt

@@ -16,9 +16,10 @@ PCL_SUBSYS_DEPEND(build "${SUBSYS_NAME}" DEPS ${SUBSYS_DEPS} OPT_DEPS ${OPT_DEPS
 
 if(build)
 
-    include_directories("${PCL_SOURCE_DIR}/test/gtest-1.6.0/include"
-                        "${PCL_SOURCE_DIR}/test/gtest-1.6.0/")
-    add_library(pcl_gtest STATIC gtest-1.6.0/src/gtest-all.cc)
+    find_package(Gtest REQUIRED)
+    include_directories(SYSTEM ${GTEST_INCLUDE_DIRS} ${GTEST_SRC_DIR})
+
+    add_library(pcl_gtest STATIC ${GTEST_SRC_DIR}/src/gtest-all.cc)
 
     if( MSVC11 ) # VS2012 doesn't correctly support variadic templates yet
         add_definitions("-D_VARIADIC_MAX=10")