C++ code compiles on mac but not on linux

Question

My code works perfectly on my mac but does not compile on linux. I get the compile error

/tmp/ccWcFSEW.o: In function `main':
DroneMap.cpp:(.text.startup+0x22d): undefined reference to `pthread_create'
DroneMap.cpp:(.text.startup+0x262): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status

Does anyone have any idea what this error message means or why i am getting it because i cant figure it out.

CXX=g++
CXXFLAGS=-Wall -O3

all: DroneMap

clean:
    rm -rf DroneMap

Those are linker errors. It can't resolve calls to the pthread library. Check to make sure that the linker can find the pthread library (usually via the -L option). — Anon Mail, Oct 09 '15 at 00:12
Try [this answer](http://stackoverflow.com/a/1665110/4440992). — Joe, Oct 09 '15 at 00:15
Your code wants to link the `pthreads` library. Ensure you have `-pthread` specified when compiling and linking. — πάντα ῥεῖ, Oct 09 '15 at 00:17

Captain Wise · Accepted Answer · 2015-10-09T00:23:14.723

3

You need to include the pthread library in your compilation command, i dont know how you compile it in MAC, but the correct compile command for linux will be like that.

CXX=g++
CXXFLAGS=-pthread -Wall -O3

all: DroneMap

clean:
    rm -rf DroneMap

edited Oct 09 '15 at 00:23

answered Oct 09 '15 at 00:18

Captain Wise

480
3
13

im sorry i dont know much about make files, how would i change mine CXX=g++ CXXFLAGS=-Wall -O3 all: DroneMap clean: rm -rf DroneMap – lazersquids mcgee Oct 09 '15 at 00:21
Add your make file in your article so we can help you – Captain Wise Oct 09 '15 at 00:21
Look at my modification in my answer – Captain Wise Oct 09 '15 at 00:23

C++ code compiles on mac but not on linux

1 Answers1