From d4682247e183beed0c176e0e3b051dfab9e20069 Mon Sep 17 00:00:00 2001
From: Luo Tao <luotao02@baidu.com>
Date: Mon, 16 Apr 2018 23:04:42 +0800
Subject: [PATCH] auto find tensorrt library

---
 CMakeLists.txt                               |  7 +----
 Dockerfile                                   |  2 +-
 cmake/configure.cmake                        | 10 ++++++
 cmake/tensorrt.cmake                         | 33 ++++++++++++++++++++
 paddle/fluid/inference/CMakeLists.txt        |  2 +-
 paddle/fluid/platform/dynload/CMakeLists.txt |  2 +-
 6 files changed, 47 insertions(+), 9 deletions(-)
 create mode 100644 cmake/tensorrt.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index de47086dbd..23bbe829ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,7 +39,6 @@ option(WITH_GPU         "Compile PaddlePaddle with NVIDIA GPU"          ${CUDA_F
 option(WITH_AMD_GPU     "Compile PaddlePaddle with AMD GPU"             OFF)
 option(WITH_AVX         "Compile PaddlePaddle with AVX intrinsics"      ${AVX_FOUND})
 option(WITH_MKL         "Compile PaddlePaddle with MKL support."        ${AVX_FOUND})
-option(WITH_TENSORRT    "Compile PaddlePaddle with TensorRT support."   OFF)
 option(WITH_DSO         "Compile PaddlePaddle with dynamic linked CUDA" ON)
 option(WITH_TESTING     "Compile PaddlePaddle with unit testing"        OFF)
 option(WITH_SWIG_PY     "Compile PaddlePaddle with inference api"       ON)
@@ -180,13 +179,9 @@ set(EXTERNAL_LIBS
 
 if(WITH_GPU)
     include(cuda)
+    include(tensorrt)
 endif(WITH_GPU)
 
-# TensorRT depends on GPU.
-if (NOT WITH_GPU)
-  set(WITH_TENSORRT OFF)
-endif()
-
 if(WITH_AMD_GPU)
     find_package(HIP)
     include(hip)
diff --git a/Dockerfile b/Dockerfile
index 9097bb657d..870304a6ac 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -46,7 +46,7 @@ ENV PATH=${PATH}:${GOROOT}/bin:${GOPATH}/bin
 RUN curl -s -q https://glide.sh/get | sh
 
 # Install TensorRT
-# The unnecessary files has been removed to make the library small.
+# The unnecessary files has been removed to make the library small. It only contains include and lib now.
 RUN wget -qO- http://paddlepaddledeps.bj.bcebos.com/TensorRT-4.0.0.3.Ubuntu-16.04.4.x86_64-gnu.cuda-8.0.cudnn7.0.tar.gz | \
     tar -xz -C /usr/local && \
     cp -rf /usr/local/TensorRT/include /usr && \
diff --git a/cmake/configure.cmake b/cmake/configure.cmake
index f726405c47..e490397cc0 100644
--- a/cmake/configure.cmake
+++ b/cmake/configure.cmake
@@ -80,6 +80,16 @@ if(WITH_GPU)
     # Include cuda and cudnn
     include_directories(${CUDNN_INCLUDE_DIR})
     include_directories(${CUDA_TOOLKIT_INCLUDE})
+
+    if(TENSORRT_FOUND)
+        if(${CUDA_VERSION_MAJOR} VERSION_LESS 8)
+            message(FATAL_ERROR "TensorRT needs CUDA >= 8.0 to compile")
+        endif()
+        if(${CUDNN_MAJOR_VERSION} VERSION_LESS 7)
+            message(FATAL_ERROR "TensorRT needs CUDNN >= 7.0 to compile")
+        endif()
+        include_directories(${TENSORRT_INCLUDE_DIR})
+    endif()
 elseif(WITH_AMD_GPU)
     add_definitions(-DPADDLE_WITH_HIP)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__HIP_PLATFORM_HCC__")
diff --git a/cmake/tensorrt.cmake b/cmake/tensorrt.cmake
new file mode 100644
index 0000000000..0c07d36bed
--- /dev/null
+++ b/cmake/tensorrt.cmake
@@ -0,0 +1,33 @@
+if(NOT WITH_GPU)
+    return()
+endif()
+
+set(TENSORRT_ROOT "/usr" CACHE PATH "TENSORRT ROOT")
+find_path(TENSORRT_INCLUDE_DIR NvInfer.h
+    PATHS ${TENSORRT_ROOT} ${TENSORRT_ROOT}/include
+    $ENV{TENSORRT_ROOT} $ENV{TENSORRT_ROOT}/include
+    NO_DEFAULT_PATH
+)
+
+find_library(TENSORRT_LIBRARY NAMES libnvinfer.so libnvinfer.a
+    PATHS ${TENSORRT_ROOT} ${TENSORRT_ROOT}/lib
+    $ENV{TENSORRT_ROOT} $ENV{TENSORRT_ROOT}/lib
+    NO_DEFAULT_PATH
+    DOC "Path to TensorRT library.")
+
+if(TENSORRT_INCLUDE_DIR AND TENSORRT_LIBRARY)
+    set(TENSORRT_FOUND ON)
+else()
+    set(TENSORRT_FOUND OFF)
+endif()
+
+if(TENSORRT_FOUND)
+    file(READ ${TENSORRT_INCLUDE_DIR}/NvInfer.h TENSORRT_VERSION_FILE_CONTENTS)
+    string(REGEX MATCH "define NV_TENSORRT_MAJOR +([0-9]+)" TENSORRT_MAJOR_VERSION
+        "${TENSORRT_VERSION_FILE_CONTENTS}")
+    string(REGEX REPLACE "define NV_TENSORRT_MAJOR +([0-9]+)" "\\1"
+        TENSORRT_MAJOR_VERSION "${TENSORRT_MAJOR_VERSION}")
+
+    message(STATUS "Current TensorRT header is ${TENSORRT_INCLUDE_DIR}/NvInfer.h. "
+        "Current TensorRT version is v${TENSORRT_MAJOR_VERSION}. ")
+endif()
diff --git a/paddle/fluid/inference/CMakeLists.txt b/paddle/fluid/inference/CMakeLists.txt
index 8494edee6c..cc45bfe9b1 100644
--- a/paddle/fluid/inference/CMakeLists.txt
+++ b/paddle/fluid/inference/CMakeLists.txt
@@ -21,7 +21,7 @@ endif()
 
 if(WITH_TESTING)
   add_subdirectory(tests/book)
-  if (WITH_TENSORRT)
+  if (TENSORRT_FOUND)
     add_subdirectory(tensorrt)
   endif()
 endif()
diff --git a/paddle/fluid/platform/dynload/CMakeLists.txt b/paddle/fluid/platform/dynload/CMakeLists.txt
index b93b925a72..364c4901b2 100644
--- a/paddle/fluid/platform/dynload/CMakeLists.txt
+++ b/paddle/fluid/platform/dynload/CMakeLists.txt
@@ -1,7 +1,7 @@
 cc_library(dynamic_loader SRCS dynamic_loader.cc DEPS glog gflags enforce)
 
 list(APPEND CUDA_SRCS cublas.cc cudnn.cc curand.cc nccl.cc)
-if (WITH_TENSORRT)
+if (TENSORRT_FOUND)
   list(APPEND CUDA_SRCS tensorrt.cc)
 endif()
 
-- 
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