Allow using external dmlc-core (#91)

* Set `RABIT_BUILD_DMLC=1` if use dmlc-core in rabit

* remove dmlc-core

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "dmlc-core"]
-	path = dmlc-core
-	url = https://github.com/dmlc/dmlc-core

.travis.yml

@@ -48,6 +48,7 @@ addons:
     update: true
       
 before_install:
+  - git clone https://github.com/dmlc/dmlc-core
   - export TRAVIS=dmlc-core/scripts/travis/
   - source ${TRAVIS}/travis_setup_env.sh
   - ${TRAVIS}/travis_osx_install.sh

CMakeLists.txt

@@ -4,6 +4,7 @@ project(rabit VERSION 0.2.0)
 
 option(RABIT_BUILD_TESTS "Build rabit tests" OFF)
 option(RABIT_BUILD_MPI "Build MPI" OFF)
+option(RABIT_BUILD_DMLC "Include DMLC_CORE in build" ON)
 
 add_library(rabit src/allreduce_base.cc src/allreduce_robust.cc src/engine.cc src/c_api.cc)
 add_library(rabit_base src/allreduce_base.cc src/engine_base.cc src/c_api.cc)
@@ -26,13 +27,23 @@ if(RABIT_BUILD_TESTS)
   list(APPEND rabit_libs rabit_mock) # add to list to apply build settings, then remove
 endif()
 
-foreach(lib ${rabit_libs})
-  #include "./internal/utils.h"
-  target_include_directories(${lib} PUBLIC
-    "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
-    "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/dmlc-core/include>"
-    )
-endforeach()
+if(RABIT_BUILD_DMLC)
+  foreach(lib ${rabit_libs})
+    #include "./internal/utils.h"
+    target_include_directories(${lib} PUBLIC
+      "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
+      "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/dmlc-core/include>"
+      )
+  endforeach()
+else()
+  foreach(lib ${rabit_libs})
+    #include "./internal/utils.h"
+    target_include_directories(${lib} PUBLIC
+      "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
+      "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/../dmlc_core/include>"
+      )
+  endforeach()
+endif()
 
 if(RABIT_BUILD_TESTS)
   list(REMOVE_ITEM rabit_libs "rabit_mock") # remove here to avoid installing it

Makefile

@@ -1,5 +1,13 @@
 OS := $(shell uname)
 
+RABIT_BUILD_DMLC = 0
+
+ifeq ($(RABIT_BUILD_DMLC),1)
+    DMLC=dmlc-core
+else
+    DMLC=../dmlc-core
+endif
+
 export WARNFLAGS= -Wall -Wextra -Wno-unused-parameter -Wno-unknown-pragmas -std=c++11
 export CFLAGS = -O3 $(WARNFLAGS) -I $(DMLC)/include -I include/
 export LDFLAGS =-Llib
@@ -74,7 +82,6 @@ ALIB= lib/librabit.a lib/librabit_empty.a lib/librabit_mock.a lib/librabit_base.
 MPISLIB= lib/librabit_mpi.so
 MPIALIB= lib/librabit_mpi.a
 HEADERS=src/*.h include/rabit/*.h include/rabit/internal/*.h
-DMLC=dmlc-core
 
 .PHONY: clean all install mpi python lint doc doxygen
 

dmlc-core

@@ -1 +0,0 @@
-Subproject commit 13d5acb8ba7e79550bbf2f730f1a3944ff0fa68b

include/rabit/serializable.h

@@ -9,7 +9,10 @@
 #include <vector>
 #include <string>
 #include "./internal/utils.h"
+
+#ifndef DMLC_IO_H_
 #include "../../dmlc-core/include/dmlc/io.h"
+#endif  // DMLC_IO_H_
 
 namespace rabit {
 /*!

scripts/travis_script.sh

@@ -2,7 +2,7 @@
 
 # main script of travis
 if [ ${TASK} == "lint" ]; then
-    make lint || exit -1
+    make lint RABIT_BUILD_DMLC=1 || exit -1
 fi
 
 if [ ${TASK} == "doc" ]; then
@@ -11,24 +11,24 @@ if [ ${TASK} == "doc" ]; then
 fi
 
 if [ ${TASK} == "build" ]; then
-    make all || exit -1
+    make all RABIT_BUILD_DMLC=1 || exit -1
 fi
 
 if [ ${TASK} == "mpi-build" ]; then
     ./scripts/mpi_build.sh
     cd test
-    make mpi && make speed_test.mpi || exit -1
+    make mpi RABIT_BUILD_DMLC=1 && make speed_test.mpi RABIT_BUILD_DMLC=1 || exit -1
 fi
 
 if [ ${TASK} == "test" ]; then
     cd test
-    make all || exit -1
+    make all RABIT_BUILD_DMLC=1 || exit -1
     ../scripts/travis_runtest.sh || exit -1
 fi
 
 if [ ${TASK} == "cmake-build" ]; then
     mkdir build
     cd build
-    cmake ..
+    cmake .. -DRABIT_BUILD_DMLC=ON
     make all || exit -1
 fi

src/socket.h

@@ -287,7 +287,7 @@ class TCPSocket : public Socket{
     struct linger sl;
     sl.l_onoff = 1;    /* non-zero value enables linger option in kernel */
     sl.l_linger = timeout;    /* timeout interval in seconds */
-    if (setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &sl, sizeof(sl)) == -1) {
+    if (setsockopt(sockfd, SOL_SOCKET, SO_LINGER, reinterpret_cast<char*>(&sl), sizeof(sl)) == -1) {
       Socket::Error("SO_LINGER");
     }
   }