我对C ++比较陌生,但我使用了log4j
(它是Python克隆logging
)。因此,我想使用log4cxx
登录我的新C ++项目。
我用
安装了log4cxxbrew install log4cxx
现在我需要将它包含在我的源文件中。我试过了,例如。
#include "log4cxx/logger.h"
namespace EnsembleClustering {
METISGraphParser::METISGraphParser() {
// logging
log4cxx::LoggerPtr logger(log4cxx::Logger::getLogger("METISGraphParser"));
logger->setLevel(log4cxx::Level::getInfo());
this->logger = logger;
}
}
似乎没有包含足够的内容,因为这给了我链接器错误
13:06:29 **** Incremental Build of configuration Debug for project EnsembleClustering ****
make all
Building file: ../src/METISGraphParser.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/METISGraphParser.d" -MT"src/METISGraphParser.d" -o "src/METISGraphParser.o" "../src/METISGraphParser.cpp"
../src/METISGraphParser.cpp: In member function 'virtual void EnsembleClustering::METISGraphParser::connectNode(EnsembleClustering::id, std::vector<unsigned int, std::allocator<unsigned int> >)':
../src/METISGraphParser.cpp:128: warning: unused variable 'deg'
../src/METISGraphParser.cpp: In member function 'virtual EnsembleClustering::Graph EnsembleClustering::METISGraphParser::parse(std::string)':
../src/METISGraphParser.cpp:112: warning: control reaches end of non-void function
Finished building: ../src/METISGraphParser.cpp
Building target: EnsembleClustering
Invoking: MacOS X C++ Linker
g++ -o "EnsembleClustering" ./src/EdgeScoring.o ./src/EdgeTripleGraphData.o ./src/EnsembleClustering.o ./src/EnsembleClusteringAlgo.o ./src/Graph.o ./src/METISGraphParser.o ./src/Matching.o ./src/Modularity.o
Undefined symbols for architecture x86_64:
"log4cxx::spi::LocationInfo::LocationInfo(char const*, char const*, int)", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::Level::getInfo()", referenced from:
EnsembleClustering::METISGraphParser::METISGraphParser()in METISGraphParser.o
EnsembleClustering::METISGraphParser::METISGraphParser()in METISGraphParser.o
"log4cxx::Level::getDebug()", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::Logger::getLogger(char const*)", referenced from:
EnsembleClustering::METISGraphParser::METISGraphParser()in METISGraphParser.o
EnsembleClustering::METISGraphParser::METISGraphParser()in METISGraphParser.o
"log4cxx::helpers::MessageBuffer::str(std::basic_ostream<char, std::char_traits<char> >&)", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::helpers::MessageBuffer::MessageBuffer()", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::helpers::MessageBuffer::~MessageBuffer()", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::helpers::MessageBuffer::operator<<(char const*)", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::helpers::ObjectPtrBase::exchange(void**, void*)", referenced from:
log4cxx::helpers::ObjectPtrT<log4cxx::Logger>::exchange(log4cxx::Logger const*)in METISGraphParser.o
"log4cxx::helpers::ObjectPtrBase::ObjectPtrBase()", referenced from:
log4cxx::helpers::ObjectPtrT<log4cxx::Logger>::ObjectPtrT()in METISGraphParser.o
"log4cxx::helpers::ObjectPtrBase::~ObjectPtrBase()", referenced from:
log4cxx::helpers::ObjectPtrT<log4cxx::Level>::~ObjectPtrT()in METISGraphParser.o
log4cxx::helpers::ObjectPtrT<log4cxx::Level>::~ObjectPtrT()in METISGraphParser.o
log4cxx::helpers::ObjectPtrT<log4cxx::Logger>::~ObjectPtrT()in METISGraphParser.o
log4cxx::helpers::ObjectPtrT<log4cxx::Logger>::~ObjectPtrT()in METISGraphParser.o
"log4cxx::helpers::CharMessageBuffer::operator<<(int)", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::Logger::isDebugEnabled() const", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"log4cxx::Logger::forcedLog(log4cxx::helpers::ObjectPtrT<log4cxx::Level> const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, log4cxx::spi::LocationInfo const&) const", referenced from:
EnsembleClustering::METISGraphParser::initGraph(int, int)in METISGraphParser.o
"typeinfo for log4cxx::helpers::ObjectPtrBase", referenced from:
typeinfo for log4cxx::helpers::ObjectPtrT<log4cxx::Level>in METISGraphParser.o
typeinfo for log4cxx::helpers::ObjectPtrT<log4cxx::Logger>in METISGraphParser.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [EnsembleClustering] Error 1
为了让我开始使用log4cxx,我需要包含哪些内容?或者我是否需要通过修改Eclipse构建设置显式链接到log4cxx? Introduction to log4cxx在这方面并不是特别有用。
答案 0 :(得分:1)
这是我如何设法正确链接log4cxx。 Homebrew为您提供了安装库的提示:
cls ~/ $ brew info log4cxx
log4cxx: stable 0.10.0
http://logging.apache.org/log4cxx/index.html
Depends on: automake, libtool
/usr/local/Cellar/log4cxx/0.10.0 (182 files, 7,3M) *
https://github.com/mxcl/homebrew/commits/master/Library/Formula/log4cxx.rb
正如用户组件10所说,我需要将-L<dir>
和-l<lib>
添加到链接器行,其中<dir>
为/usr/local/Cellar/log4cxx/0.10.0/lib/
且<lib>
为library name (不是文件名)log4cxx
。
在Eclipse中,我需要编辑以下设置:
答案 1 :(得分:1)
为了使这个稍微简单一点,你可以做到
brew link log4cxx
它将为/ usr / local / lib和/ usr / local / include中的库创建符号链接,这些符号通常位于默认的链接器/包含搜索路径中。
您仍然需要指定-llog4cxx。