CODEWITHSUNDEEP
pathcompilationg++
mrswmmr
mrswmmr

Reputation: 2141

How do I include a path to libraries in g++

I am trying to include the path to extra libraries in my makefile, but I can't figure out how to get the compiler to use that path. So far I have:

g++ -g -Wall testing.cpp fileparameters.cpp main.cpp -o test

and I want to include the path to

/data[...]/lib

because testing.cpp includes files from that library. Also, I'm on a Linux machine.

EDIT: Not a path to a library. Just to header files from that library that were included. My bad.

Upvotes: 149

Views: 348517

Answers (3)

zyy
zyy

Reputation: 1574

Alternatively you could setup environment variables. Suppose you are using bash, then in ~/.bashrc, write

C_INCLUDE_PATH="/data/.../lib/:$C_INCLUDE_PATH" ## for C compiler
CPLUS_INCLUDE_PATH="/data/.../lib/:$CPLUS_INCLUDE_PATH" ## for Cpp compiler
export C_INCLUDE_PATH
export CPLUS_INCLUDE_PATH

and source it with source ~/.bashrc. You should be good to go.

Upvotes: 4

Ernest Friedman-Hill
Ernest Friedman-Hill

Reputation: 81674

To specify a directory to search for (binary) libraries, you just use -L:

-L/data[...]/lib

To specify the actual library name, you use -l:

-lfoo  # (links libfoo.a or libfoo.so)

To specify a directory to search for include files (different from libraries!) you use -I:

-I/data[...]/lib

So I think what you want is something like

g++ -g -Wall -I/data[...]/lib testing.cpp fileparameters.cpp main.cpp -o test

These compiler flags (amongst others) can also be found at the GNU GCC Command Options manual:

Upvotes: 257

Kartik Javali
Kartik Javali

Reputation: 327

In your MakeFile or CMakeLists.txt you can set CMAKE_CXX_FLAGS as below:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I/path/to/your/folder")

Upvotes: 7

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