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https://issues.apache.org/jira/browse/SINGA-272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15686813#comment-15686813
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wangwei commented on SINGA-272:
-------------------------------
If libA.so's code uses libB.so, and libA.so is generated by linking it with
libB.so, when I use functions from libA.so in my code C.bin, it would be better
to generate C.bin without linking it with with libB.so.
For libraries like protobuf, opencv, etc., we don't need to link their
dependent libs into our own executable files when we use them.
Is it because they don't have other dependency, or any other linking arguments
for fixing this issue?
> singa::logging classes are missing from libsinga.so
> ----------------------------------------------------
>
> Key: SINGA-272
> URL: https://issues.apache.org/jira/browse/SINGA-272
> Project: Singa
> Issue Type: Bug
> Environment: Linux (Ubuntu)
> Reporter: Moaz Reyad
>
> When I try to compile a C++ file like
> {code:title=test.cpp|borderStyle=solid}
> #include "singa/io/encoder.h"
> #include "singa/io/decoder.h"
> #include <iostream>
> #include <sstream>
> #include <algorithm>
> using namespace std;
> using singa::Shape;
> using singa::Tensor;
> int main()
> {
> cout << "Testing..." << endl;
> singa::CSVEncoder encoder;
> singa::CSVDecoder decoder;
> singa::DecoderConf decoder_conf;
> decoder_conf.set_has_label(true);
> decoder.Setup(decoder_conf);
> float in_data[] = {1.23f, 4.5f, 5.1f, 3.33f, 0.44f};
> std::string in_str = "2, 1.23, 4.5, 5.1, 3.33, 0.44";
> int in_label = 2;
> size_t size = 5;
> std::vector<Tensor> input;
> Tensor data(Shape{size}, singa::kFloat32), label(Shape{1}, singa::kInt);
> data.CopyDataFromHostPtr<float>(in_data, size);
> label.CopyDataFromHostPtr<int>(&in_label, 1);
> input.push_back(data);
> input.push_back(label);
> std::string value = encoder.Encode(input);
> in_str.erase(std::remove(in_str.begin(), in_str.end(), ' '), in_str.end());
> std::vector<Tensor> output = decoder.Decode(value);
> const auto* out_data = output.at(0).data<float>();
> const auto* out_label = output.at(1).data<int>();
> return 0;
> }
> {code}
> I get this error:
> {code:title=compiling|borderStyle=solid}
> $ g++ ./test.cpp -l singa
> /tmp/cc46xzSI.o: In function `singa::Block::data() const':
> test.cpp:(.text._ZNK5singa5Block4dataEv[_ZNK5singa5Block4dataEv]+0x4b):
> undefined reference to `singa::logging::LogMessageFatal::LogMessageFatal(char
> const*, int)'
> test.cpp:(.text._ZNK5singa5Block4dataEv[_ZNK5singa5Block4dataEv]+0x7f):
> undefined reference to `singa::logging::LogMessageFatal::~LogMessageFatal()'
> test.cpp:(.text._ZNK5singa5Block4dataEv[_ZNK5singa5Block4dataEv]+0xba):
> undefined reference to `singa::logging::LogMessageFatal::~LogMessageFatal()'
> collect2: error: ld returned 1 exit status
> {code}
> I think singa::logging classes are not linked correctly in libsinga.so during
> installation.
> The workaround is to do:
> $g++ -DUSE_GLOG ./test.cpp -l singa -l glog
> But it is better if libsinga.so is built with singa::logging classes.
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