包括log4cxx在内的麻烦
包括log4cxx在内的麻烦
提问于 2012-10-18 19:08:25
我对C++比较陌生，但我用过log4j (它是Python的克隆logging)。因此，我想使用log4cxx来登录我的新C++项目。
我安装log4cxx的时候
brew 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;
}
}它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要开始使用log4cxx，我需要包含哪些内容？或者我是否需要通过修改我的Eclipse build设置来显式地链接到log4cxx？在这方面，Introduction to log4cxx并没有特别的帮助。
回答 2
Stack Overflow用户
回答已采纳
发布于 2012-10-18 19:41:19
下面是我是如何正确链接log4cxx的。Homebrew会给你一个提示，它把这个库安装在哪里：
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>是/usr/local/Cellar/log4cxx/0.10.0/lib/，<lib>是库名(而不是文件名) log4cxx。
在Eclipse中，我需要编辑以下设置：
Stack Overflow用户
发布于 2013-03-09 10:31:56
要使这稍微简单一点，您可以这样做
brew link log4cxx 它将创建指向/usr/local/lib和/usr/local/include中的库的符号链接，这两个库通常位于默认的链接器/include搜索路径中。
您仍然需要指定-llog4cxx。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/12953220
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