On compilation: undefined reference to `clock_gettime'

[wimrijnders]

On compile, I get the following errors:

systemtime.cpp:121: undefined reference to `clock_gettime'
/tmp/ccoaIDky.o: In function `moodycamel::getTimeDelta(timespec)':
systemtime.cpp:134: undefined reference to `clock_gettime'
collect2: error: ld returned 1 exit status

This is on Ubuntu 14.04, using gcc v 4.8.1

The solution is trivial: command-line option '-lrt' should be right at the the end of the command line, not in between, eg.:

g++ -std=gnu++11 -Wall -Wconversion -fno-elide-constructors -pthread -g -O0 ../tests/common/simplethread.cpp ../tests/common/systemtime.cpp ../tests/unittests/unittests.cpp -o bin/unittests -lrt

Please adjust your makefile accordingly.

Thanks,

Wim.

[cameron314]

Oops. Done, thanks. Not sure why it worked on my Fedora box without trouble.

[wimrijnders]

It's just one of those unexplainable things in computing. It's unavoidable that we get touched by the Twilight Zone from time to time.

However, I'm pretty sure that if you put the -l parameters at the end, the makefile will be more globally compatible. So thanks for the change.

[wimrijnders]

Just cloned, the build was perfect this time.