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https://issues.apache.org/jira/browse/SINGA-272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15688755#comment-15688755
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Xie Zhongle commented on SINGA-272:
-----------------------------------
Glog is an optional lib, which means we can compile SINGA without glog.
I have already passed the compilation for SINGA and your test code without glog
libs.
Please clean your build directory for SINGA after you uninstall glog libs,
especially cmake cache files.
Perhaps this is the cause leading to your ERROR message.
Normally, it should be a warning but the compilation should continue.
> 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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