Ncnn: ubuntu编译报错

[douyh]

OS：Ubuntu 16.04 LTS
在安装好了Opencv之后执行下面的

$ cd <ncnn-root-dir>

uncomment add_subdirectory(examples)
 in CMakeLists.txt with your favourite editor

$ mkdir -p build
$ cd build
$ cmake ..
$ make -j4

到了make -j4这里出现了下面的错误：

collect2: error: ld returned 1 exit status
examples/CMakeFiles/fasterrcnn.dir/build.make:99: recipe for target 'examples/fasterrcnn' failed
make[2]: *** [examples/fasterrcnn] Error 1
CMakeFiles/Makefile2:89: recipe for target 'examples/CMakeFiles/fasterrcnn.dir/all' failed
make[1]: *** [examples/CMakeFiles/fasterrcnn.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

求助这是什么问题？

[kyo055]

upgrade protobuf to 2.6.1 or higher
or you can disable onnx2ncnn tool by commenting it out in tools/CMakeLists.txt

[Wangweilai1]

uncomment add_subdirectory(examples)的时候即使 upgrade protobuf to 2.6.1 or higher
or you can disable onnx2ncnn tool by commenting it out in tools/CMakeLists.txt 这样也不行，只有注释掉add_subdirectory(examples)才能成功编译过，请问为什么？

[kyo055]

我也遇到了这种情况，应该是protobuf的问题，我发现其他的都还好，只有和protobuf相关的examples会报错

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发件人： wangweilai
发送时间： 2018-07-03 12:48
收件人： Tencent/ncnn
抄送： kyo055; Comment
主题： Re: [Tencent/ncnn] ubuntu编译报错 (#421)
uncomment add_subdirectory(examples)的时候即使 upgrade protobuf to 2.6.1 or higher
or you can disable onnx2ncnn tool by commenting it out in tools/CMakeLists.txt 这样也不行，只有注释掉add_subdirectory(examples)才能成功编译过，请问为什么？
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[Wangweilai1]

可是我把protobuf升级到2.6.1了也还是不行，不知道怎么回事。

[kyo055]

白天要上班， 周末试一下看看 再跟你交流

[email protected]

发件人： wangweilai
发送时间： 2018-07-06 11:45
收件人： Tencent/ncnn
抄送： kyo055; Comment
主题： Re: [Tencent/ncnn] ubuntu编译报错 (#421)
可是我把protobuf升级到2.6.1了也还是不行，不知道怎么回事。
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[unanan]

Same to me.
Usemake to see full log. -j4means using multiple threads to build the target.
This is my log.

[ 89%] Built target ncnn
[ 91%] Built target ncnn2mem
make[2]: *** No rule to make target '../tools/caffe/PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND', needed by 'tools/caffe/caffe.pb.cc'。 停止。
CMakeFiles/Makefile2:200: recipe for target 'tools/caffe/CMakeFiles/caffe2ncnn.dir/all' failed
make[1]: *** [tools/caffe/CMakeFiles/caffe2ncnn.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

Then I found it hung on at Caffe and ONNX.
Taken advise of @kyo055 , I commented the add_subdirectory(caffe)and #add_subdirectory(onnx)out in the file~/ncnn/tools/CMakeLists.txt. It finally succeeded.:

[  8%] Linking CXX static library libncnn.a
[ 94%] Built target ncnn
[ 95%] Linking CXX executable ncnn2mem
[ 97%] Built target ncnn2mem
[100%] Built target mxnet2ncnn

Hope it can help you.

[nihui]

已针对新 protobuf 需要 c++11 编译问题做了更新

[EroData]

Same to me.
Usemake to see full log. -j4means using multiple threads to build the target.
This is my log.

[ 89%] Built target ncnn
[ 91%] Built target ncnn2mem
make[2]: *** No rule to make target '../tools/caffe/PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND', needed by 'tools/caffe/caffe.pb.cc'。 停止。
CMakeFiles/Makefile2:200: recipe for target 'tools/caffe/CMakeFiles/caffe2ncnn.dir/all' failed
make[1]: *** [tools/caffe/CMakeFiles/caffe2ncnn.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

Then I found it hung on at Caffe and ONNX.
Taken advise of @kyo055 , I commented the add_subdirectory(caffe)and #add_subdirectory(onnx)out in the file~/ncnn/tools/CMakeLists.txt. It finally succeeded.:

[  8%] Linking CXX static library libncnn.a
[ 94%] Built target ncnn
[ 95%] Linking CXX executable ncnn2mem
[ 97%] Built target ncnn2mem
[100%] Built target mxnet2ncnn

Hope it can help you.
But I do it as you said, and fact is, if you uncommented "add_subdirectory(onnx)" and " "add_subdirectory(caffe)", you actually haven't install the tools onnx2ncnn and caffe2ncnn, which is I need. So it just pass by the two important steps...