PThread Issue: -pthread vs. -lpthread for a new port

[Simon Barner]

Hi,

the ports framework has the variables ${PTHREAD_CFLAGS} and ${PTHREAD_LIBS}
that take care of the right usage of -D_THREAD_SAFE and -pthread, -lpthread,
-lc_r respectively.

Depending on your FreeBSD version, different combinations are necessary
to link in thread support (for details see ports/Mk/bsd.port.mk, ll.
1787).

To sum this up: You must not hard-code any of these thread things, but
use the PTHREAD_* variables.

Simon
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