g++ -l flag in Eclipse

linux
#1

Does anyone know how to add an -l flag to my build in Eclipse Kepler?

My build requires the following commands:

  
$ g++ sniff.cpp -o sniff -lcrafter

However, currently when Eclipse builds my project, the only commands it receives are:

  
g++  -o "sniffer_crafter"  ./src/sniffer_crafter.o

From this I get these error messages:

  
13:24:54 **** Incremental Build of configuration Debug for project sniffer_crafter ****  
make all   
Building target: sniffer_crafter  
Invoking: GCC C++ Linker  
g++  -o "sniffer_crafter"  ./src/sniffer_crafter.o     
./src/sniffer_crafter.o: In function `main':  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:22: undefined reference to `Crafter::RawLayer::RawLayer(char const*)'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:23: undefined reference to `Crafter::RawLayer::RawLayer(char const*)'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:26: undefined reference to `Crafter::operator/(Crafter::Layer const&, Crafter::Layer const&)'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:29: undefined reference to `Crafter::Packet::Print() const'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:30: undefined reference to `Crafter::Packet::HexDump(std::ostream&)'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:31: undefined reference to `Crafter::Packet::RawString(std::ostream&)'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:34: undefined reference to `Crafter::Packet::Send(std::string const&)'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:26: undefined reference to `Crafter::Packet::~Packet()'  
/home/gryzynger/Documents/cpp_workspace/sniffer_crafter/Debug/../src/sniffer_crafter.cpp:26: undefined reference to `Crafter::Packet::~Packet()'  
./src/sniffer_crafter.o: In function `Crafter::RawLayer::~RawLayer()':  
/usr/local/include/crafter/Protocols/RawLayer.h:80: undefined reference to `vtable for Crafter::RawLayer'  
/usr/local/include/crafter/Protocols/RawLayer.h:80: undefined reference to `Crafter::Layer::~Layer()'  
collect2: error: ld returned 1 exit status  
make: *** [sniffer_crafter] Error 1  
  
13:24:55 Build Finished (took 162ms)

How can I resolve this? When I invoke the g++ complier from the terminal I don’t have any issues running the program.

#2

in linux you can add additional libraries in the LDFLAGS section in the config.make file

#3

Is there a way to add this through any of Eclipse’s interfaces though?

#4

no, we don’t use the typical eclipse configuration since the projects are based on custom makefiles

#5

Okay, for this then my current config.make file has for that section:

  
# PROJECT_LDFLAGS=-Wl,-rpath=./libs

I would then just put:

  
# PROJECT_LDFLAGS=-Wl,-lfoo,-rpath=./libs

Or is there a different syntax I should be using here?

#6

the # in makefiles is a comment so you need to remove it, the other flags are not really needed:

  
  
PROJECT_LDFLAGS=-lfoo

should do, if you need to add several libraries the separator is a space not a comma, like:

  
  
PROJECT_LDFLAGS=-lfoo -lbar

the flags are the same you would pass to g++

1 Like
#7

Thanks, that did the trick.