#244 skip jemalloc build if it is not in the third party directory

cmake_modules/TokuThirdParty.cmake

@@ -3,35 +3,34 @@ include(ExternalProject)
 if (NOT DEFINED LIBJEMALLOC)
     ## add jemalloc with an external project
     set(JEMALLOC_SOURCE_DIR "${TokuDB_SOURCE_DIR}/third_party/jemalloc" CACHE FILEPATH "Where to find jemalloc sources.")
-    if (NOT EXISTS "${JEMALLOC_SOURCE_DIR}/configure")
-        message(FATAL_ERROR "Can't find jemalloc sources.  Please check them out to ${JEMALLOC_SOURCE_DIR} or modify JEMALLOC_SOURCE_DIR.")
-    endif ()
-    set(jemalloc_configure_opts "CC=${CMAKE_C_COMPILER}" "--with-jemalloc-prefix=" "--with-private-namespace=tokudb_jemalloc_internal_" "--enable-cc-silence")
-    option(JEMALLOC_DEBUG "Build jemalloc with --enable-debug." OFF)
-    if (JEMALLOC_DEBUG)
-        list(APPEND jemalloc_configure_opts --enable-debug)
-    endif ()
-    ExternalProject_Add(build_jemalloc
-        PREFIX jemalloc
-        SOURCE_DIR "${JEMALLOC_SOURCE_DIR}"
-        CONFIGURE_COMMAND
-            "${JEMALLOC_SOURCE_DIR}/configure" ${jemalloc_configure_opts}
-            "--prefix=${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc"
-    )
+    if (EXISTS "${JEMALLOC_SOURCE_DIR}/configure")
+        set(jemalloc_configure_opts "CC=${CMAKE_C_COMPILER}" "--with-jemalloc-prefix=" "--with-private-namespace=tokudb_jemalloc_internal_" "--enable-cc-silence")
+        option(JEMALLOC_DEBUG "Build jemalloc with --enable-debug." OFF)
+        if (JEMALLOC_DEBUG)
+            list(APPEND jemalloc_configure_opts --enable-debug)
+        endif ()
+        ExternalProject_Add(build_jemalloc
+            PREFIX jemalloc
+            SOURCE_DIR "${JEMALLOC_SOURCE_DIR}"
+            CONFIGURE_COMMAND
+                "${JEMALLOC_SOURCE_DIR}/configure" ${jemalloc_configure_opts}
+                "--prefix=${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc"
+        )
 
-    add_library(jemalloc STATIC IMPORTED GLOBAL)
-    set_target_properties(jemalloc PROPERTIES IMPORTED_LOCATION
-        "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc/lib/libjemalloc_pic.a")
-    add_dependencies(jemalloc build_jemalloc)
-    add_library(jemalloc_nopic STATIC IMPORTED GLOBAL)
-    set_target_properties(jemalloc_nopic PROPERTIES IMPORTED_LOCATION
-        "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc/lib/libjemalloc.a")
-    add_dependencies(jemalloc_nopic build_jemalloc)
+        add_library(jemalloc STATIC IMPORTED GLOBAL)
+        set_target_properties(jemalloc PROPERTIES IMPORTED_LOCATION
+            "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc/lib/libjemalloc_pic.a")
+        add_dependencies(jemalloc build_jemalloc)
+        add_library(jemalloc_nopic STATIC IMPORTED GLOBAL)
+        set_target_properties(jemalloc_nopic PROPERTIES IMPORTED_LOCATION
+            "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc/lib/libjemalloc.a")
+        add_dependencies(jemalloc_nopic build_jemalloc)
 
-    # detect when we are being built as a subproject
-    if (NOT DEFINED MYSQL_PROJECT_NAME_DOCSTRING)
-        install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc/lib" DESTINATION .
-          COMPONENT tokukv_libs_extra)
+        # detect when we are being built as a subproject
+        if (NOT DEFINED MYSQL_PROJECT_NAME_DOCSTRING)
+            install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/jemalloc/lib" DESTINATION .
+                COMPONENT tokukv_libs_extra)
+        endif ()
     endif ()
 endif ()