On Apr 16, 2008, at 12:31 PM, Török Edwin wrote: > Manpages indicate to use -pthread to link. > Linux: man pthreads > Compiling on Linux > On Linux, programs that use the Pthreads API should be compiled > using cc -pthread > > FreeBSD: > http://www.freebsd.org/cgi/man.cgi?query=pthread&apropos=0&sektion=0&manpath=FreeBSD+4.11-RELEASE&format=html > > A FreeBSD specific option has been added to gcc to make linking > threaded > processes simple. gcc -pthread links a threaded process against > libc_r > INSTEAD OF libc.
Historically, enabling POSIX threads required more than just linking to a libpthread.a/.so library. It could need a preprocessor macro defined to change the includes from the system headers, for example, and the linking stage might need to pull in a different [g]crt0.o/[g]crt1.o prologue, or a different (re- entrant) std C library as mentioned above, etc. So, the notion of "cc -pthread" was developed to roll all of the various changes that the compiler toolchain would need into a single flag... Regards, -- -Chuck _______________________________________________ Help us build a comprehensive ClamAV guide: visit http://wiki.clamav.net http://lurker.clamav.net/list/clamav-users.html
