Make building of metis/partition optional via cmake flag

gtsam/3rdparty/CMakeLists.txt

@@ -25,8 +25,11 @@ if(NOT GTSAM_USE_SYSTEM_EIGEN)
 		FILES_MATCHING PATTERN "*.h")
 endif()
 
+option(GTSAM_BUILD_METIS "Build metis library" ON)
 option(GTSAM_BUILD_METIS_EXECUTABLES "Build metis library executables" OFF)
-add_subdirectory(metis-5.1.0)
+if(GTSAM_BUILD_METIS)
+	add_subdirectory(metis-5.1.0)
+endif(GTSAM_BUILD_METIS)
 ############ NOTE:  When updating GeographicLib be sure to disable building their examples
 ############        and unit tests by commenting out their lines:
 # add_subdirectory (examples)

gtsam/3rdparty/metis-5.1.0/CMakeLists.txt

@@ -8,6 +8,7 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
 endif()
 
 add_definitions(-Wno-unknown-pragmas)
+add_definitions(-Wunused-but-set-variable)
 
 set(GKLIB_PATH ${PROJECT_SOURCE_DIR}/GKlib CACHE PATH "path to GKlib")
 set(SHARED FALSE CACHE BOOL "build a shared library")

gtsam_unstable/CMakeLists.txt

@@ -6,10 +6,13 @@ set (gtsam_unstable_subdirs
     discrete
     dynamics
     nonlinear
-    partition
     slam
 )
 
+if(GTSAM_BUILD_METIS) # Only build partition if metis is built
+    set (gtsam_unstable_subdirs ${gtsam_unstable_subdirs} partition)
+endif(GTSAM_BUILD_METIS)
+
 set(GTSAM_UNSTABLE_BOOST_LIBRARIES ${GTSAM_BOOST_LIBRARIES})
 
 add_custom_target(check.unstable COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure)
@@ -47,10 +50,13 @@ set(gtsam_unstable_srcs
     ${discrete_srcs}
     ${dynamics_srcs}
     ${nonlinear_srcs}
-    ${partition_srcs}
     ${slam_srcs}
 )
 
+if(GTSAM_BUILD_METIS) # Only build partition if metis is built
+    set (gtsam_unstable_srcs ${gtsam_unstable_srcs} ${partition_srcs})
+endif(GTSAM_BUILD_METIS)
+
 # Versions - same as core gtsam library
 set(gtsam_unstable_version   ${GTSAM_VERSION_MAJOR}.${GTSAM_VERSION_MINOR}.${GTSAM_VERSION_PATCH})
 set(gtsam_unstable_soversion ${GTSAM_VERSION_MAJOR})