Hi Could someone explain what is the difference between compiling a program with -lpthread or -pthread ? I needed to use pthread_atfork() function in a c program. Only when compiling with -pthread that function is found in the library.
thanks Bogdan
When using -lpthread, did you remember to put the library specification after the object files on the command line?
-- Tauno Voipio tauno voipio (at) iki fi
In GCC, the -pthread (aka -pthreads) option manages both the compiler preprocessor /and/ linker to enable compilation with Posix threads. The preprocessor will define/enable/use Posix threads versions of some macros (or perform conditional compilation to enable Posix threads logic), and the linker will specifically link the resultant object against libpthread
However, -lpthread simply tells the linker to attempt to resolve any external references against the libpthread library, in the same way that -lm tells the linker to attempt to resolve any external references against the libm library. For -lpthread, your code might not contain external references to libpthread, even if you wrote Posix thread code, because the critical macros haven't been switched on.
-- Lew Pitcher Master Codewright & JOAT-in-training | Registered Linux User #112576 Me: http://pitcher.digitalfreehold.ca/ | Just Linux: http://justlinux.ca/ ---------- Slackware - Because I know what I'm doing. ------
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