[Build] Support older CMake & OpenMP toggle (#619)

* cmake fixes for older systems

* allow specification of cuda path

* test script fixes to enable openmp & test

* update minigun; disable minigun partial frontier compile

CMakeLists.txt

-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.5)
 ########################################
 # Borrowed and adapted from TVM project
 ########################################
@@ -27,7 +27,7 @@ dgl_option(BUILD_CPP_TEST "Build cpp unittest executables" OFF)
 
 if(USE_CUDA)
   message(STATUS "Build with CUDA support")
-  project(dgl C CXX CUDA)
+  project(dgl C CXX)
   include(cmake/modules/CUDA.cmake)
 endif(USE_CUDA)
 
@@ -70,13 +70,18 @@ else(MSVC)
   check_cxx_compiler_flag("-std=c++11"    SUPPORT_CXX11)
   set(CMAKE_C_FLAGS "-O2 -Wall -fPIC ${CMAKE_C_FLAGS}")
   set(CMAKE_CXX_FLAGS "-O2 -Wall -fPIC -std=c++11 ${CMAKE_CXX_FLAGS}")
+endif(MSVC)
 
+if(USE_OPENMP)
   include(FindOpenMP)
   if(OPENMP_FOUND)
     set(CMAKE_C_FLAGS "${OpenMP_C_FLAGS} ${CMAKE_C_FLAGS}")
     set(CMAKE_CXX_FLAGS "${OpenMP_CXX_FLAGS} ${CMAKE_CXX_FLAGS}")
   endif(OPENMP_FOUND)
-endif(MSVC)
+endif(USE_OPENMP)
+
+# configure minigun
+add_definitions(-DENABLE_PARTIAL_FRONTIER=0)  # disable minigun partial frontier compile
 
 # Source file lists
 file(GLOB DGL_SRC
@@ -93,6 +98,7 @@ file(GLOB_RECURSE DGL_SRC_1
 
 list(APPEND DGL_SRC ${DGL_SRC_1})
 
+# Configure cuda
 if(USE_CUDA)
   dgl_config_cuda(DGL_CUDA_SRC)
   list(APPEND DGL_SRC ${DGL_CUDA_SRC})

cmake/config.cmake

@@ -36,3 +36,6 @@ set(USE_CUDA OFF)
 #---------------------------------------------
 # Whether to build cpp unittest executables
 set(BUILD_CPP_TEST OFF)
+
+# Whether to enable OpenMP
+set(USE_OPENMP ON)

cmake/util/FindCUDA.cmake

@@ -5,7 +5,8 @@
 #   find_cuda(${USE_CUDA})
 #
 # - When USE_CUDA=ON, use auto search
-# - When USE_CUDA=/path/to/cuda-path, use the cuda path
+#
+# Please use the CMAKE variable CUDA_TOOLKIT_ROOT_DIR to set CUDA directory
 #
 # Provide variables:
 #
@@ -21,21 +22,7 @@
 macro(find_cuda use_cuda)
   set(__use_cuda ${use_cuda})
   if(__use_cuda STREQUAL "ON")
-    find_package(CUDA QUIET)
-  elseif(IS_DIRECTORY ${__use_cuda})
-    set(CUDA_TOOLKIT_ROOT_DIR ${__use_cuda})
-    message(STATUS "Custom CUDA_PATH=" ${CUDA_TOOLKIT_ROOT_DIR})
-    set(CUDA_INCLUDE_DIRS ${CUDA_TOOLKIT_ROOT_DIR}/include)
-    set(CUDA_FOUND TRUE)
-    if(MSVC)
-      find_library(CUDA_CUDART_LIBRARY cudart
-        ${CUDA_TOOLKIT_ROOT_DIR}/lib/x64
-        ${CUDA_TOOLKIT_ROOT_DIR}/lib/Win32)
-    else(MSVC)
-      find_library(CUDA_CUDART_LIBRARY cudart
-        ${CUDA_TOOLKIT_ROOT_DIR}/lib64
-        ${CUDA_TOOLKIT_ROOT_DIR}/lib)
-    endif(MSVC)
+    include(FindCUDA)
   endif()
 
   # additional libraries

tests/scripts/build_dgl.bat

@@ -7,7 +7,7 @@ MD build
 
 PUSHD build
 CALL "C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Auxiliary\Build\vcvars64.bat"
-cmake -DCMAKE_CXX_FLAGS="/DDGL_EXPORTS" -Dgtest_force_shared_crt=ON -DBUILD_CPP_TEST=1 -DCMAKE_CONFIGURATION_TYPES="Release" .. -G "Visual Studio 15 2017 Win64" || EXIT /B 1
+cmake -DCMAKE_CXX_FLAGS="/DDGL_EXPORTS" -DUSE_OPENMP=ON -Dgtest_force_shared_crt=ON -DBUILD_CPP_TEST=1 -DCMAKE_CONFIGURATION_TYPES="Release" .. -G "Visual Studio 15 2017 Win64" || EXIT /B 1
 msbuild dgl.sln || EXIT /B 1
 COPY Release\dgl.dll .
 COPY Release\runUnitTests.exe .

tests/scripts/build_dgl.sh

@@ -6,9 +6,10 @@ if [ $# -ne 1 ]; then
     exit -1
 fi
 
+CMAKE_VARS="-DBUILD_CPP_TEST=ON -DUSE_OPENMP=ON"
+
 if [ "$1" == "gpu" ]; then
-    cp cmake/config.cmake config.cmake
-    sed -i -e 's/USE_CUDA OFF/USE_CUDA ON/g' config.cmake
+    CMAKE_VARS="-DUSE_CUDA=ON $CMAKE_VARS"
 fi
 
 if [ -d build ]; then
@@ -19,7 +20,7 @@ mkdir build
 rm -rf _download
 
 pushd build
-cmake .. -DBUILD_CPP_TEST=1
+cmake $CMAKE_VARS ..
 make -j4
 popd
 

minigun @ e77ce949

-Subproject commit bcf5f041dde6ce43264dd10159677eb81bd2eed9
+Subproject commit e77ce949601570980f76630862ee838cf8bbc96a