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From: Jonathan Wakely (cow_at_[hidden])
Date: 2004-07-29 05:52:17

On Thu, Jul 29, 2004 at 11:25:49AM +0100, John Maddock wrote:

> > Either add the "-pthread" option to your compiles (and links) manually,
> > or use a build system tool that adds it for you (like Boost.Build).
> There isn't a -pthread option on BSD, it's spelled -lpthread :-)

Are you sure?

    $ uname
    $ gcc -pthread
    gcc: No input files specified
    $ gcc -pthreads
    gcc: unrecognized option `-pthreads'
    gcc: No input files specified
    $ gcc -lpthread
    /usr/libexec/elf/ld: cannot find -lpthread
    $ locate libpthread

libpthread doesn't exist on most FreeBSD systems, unless (as above) as
part of the linux compatibility runtime, used when running linux
executables). Instead the pthread_* functions are contained in a
reentrant version of libc: libc_r.

For GCC 3 on FreeBSD when -pthread is given then the linker is passed
-lc_r (to link to the reentrant version of libc) and when -pthread is
absent the linker is passed -lc (the non-reentrant libc).

(It's slightly complicated by the absence/presence of -pg, as there are
also profiling versions of libc, so you end up with one of libc, libc_r,
libc_p, or libc_r_p)

The behaviour seems to be the same on GCC 2.95 though I haven't
checked the source to confirm that.


Dull but sincere filler

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