undefined reference to `pthread_once`

[dappiu]

On Ubuntu Server 14.04.2 LTS launching ./Buildit script gave me some pthread_* undefined references when compiling file OSMutex.cpp

I solved editing Buildit script moving "-lpthread" as the last -l option on the variable CORE_LINK_LIBS

CORE_LINK_LIBS="-lstdc++ -lm -lcrypt -ldl -lpthread"

But then I received some errors about undefined references to dlopen() then I modified again CORE_LINK_LIBS this way:

CORE_LINK_LIBS="-lstdc++ -lm -lcrypt -lpthread -ldl"

ran ./Buildit clean, then ./Buildit and finally the compilation reached the end without errors.

As stated here the link order of libraries is important and maybe different linkers inspect the libraries in different orders.