Deliver the compiler configurations of Paddle to external libraries.

cmake/external/gflags.cmake

@@ -31,6 +31,10 @@ ExternalProject_Add(
     GIT_REPOSITORY  "https://github.com/gflags/gflags.git"
     PREFIX          ${GFLAGS_SOURCES_DIR}
     UPDATE_COMMAND  ""
+    CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${GFLAGS_INSTALL_DIR}
     CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON
     CMAKE_ARGS      -DBUILD_TESTING=OFF

cmake/external/glog.cmake

@@ -33,6 +33,10 @@ ExternalProject_Add(
     GIT_REPOSITORY  "https://github.com/google/glog.git"
     PREFIX          ${GLOG_SOURCES_DIR}
     UPDATE_COMMAND  ""
+    CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${GLOG_INSTALL_DIR}
     CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON
     CMAKE_ARGS      -DWITH_GFLAGS=ON

cmake/external/gtest.cmake

@@ -41,6 +41,10 @@ IF(WITH_TESTING)
         GIT_TAG         "release-1.8.0"
         PREFIX          ${GTEST_SOURCES_DIR}
         UPDATE_COMMAND  ""
+        CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+        CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+        CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+        CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
         CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX:PATH=${GTEST_INSTALL_DIR}
         CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON
         CMAKE_ARGS      -DBUILD_GMOCK=ON

cmake/external/warpctc.cmake

@@ -50,6 +50,8 @@ ExternalProject_Add(
     UPDATE_COMMAND  ""
     CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
     CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${WARPCTC_INSTALL_DIR}
     CMAKE_ARGS      -DWITH_GPU=${WITH_GPU}
     CMAKE_ARGS      -DWITH_OMP=${USE_OMP}

cmake/external/zlib.cmake

@@ -34,6 +34,10 @@ ExternalProject_Add(
     GIT_TAG         "v1.2.8"
     PREFIX          ${ZLIB_SOURCES_DIR}
     UPDATE_COMMAND  ""
+    CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${ZLIB_INSTALL_DIR}
     CMAKE_ARGS      -DBUILD_SHARED_LIBS=OFF
     CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON