Eclipse C/C++ (CDT) add -l option (linking math module) gcc -lm

Question

I am trying to have eclipse on linux (Ubuntu) link the math module. Normally I would link with gcc -lm. How do I get eclipse to add this? Is it in library paths under Project->Properties? Where does the math module reside on a linux Ubuntu system?

Solution 1

Somewhere along this path: Project->Properties->C/C++ Build->Settings, then under the Tools tab: GCC Linker->Libraries

As for where it is in the system, usually /usr/lib/libm.so.

FYI, this is all true of my system, but may differ slightly on yours for any number of reasons. Shouldn't be hard to adjust if needed.

Solution 2

Go to Project and select Properties. Expand C/C++ Build and choose Settings. Under the Tool settings tab expand GCC Linker and select Libraries. At the right of the window, add a library named m at Libraries (-l).

Comments

[eat_a_lemon]

I found the -l option under C/C++ build => Settings => GCC C Linker => Libraries

[dom]

@loan I am facing same problem and I found "libm.so" But I don't know what to do next ??? plz guide

[Andrea993]

You can easily add the character m instead of the path. It works for me. It cause the parameter -lm

[Chris Good]

Where do you do that in eclipse 2019-12? My C/C++ project is using cmake + ninja. Do I have to recreate the project? Setting LD_LIBRARY_PATH in workspace preferences, C/C++, Build, Environment doesn't work.