[patch #7666] ax_pthread macro fails for C++ on Solaris

[Daniel Richard G.]

Follow-up Comment #3, patch #7666 (project autoconf-archive):

> What does PTHREAD_CFLAGS and PTHREAD_LIBS return without this patch?

On both a 64-bit Solaris 8 system, and a 64-bit/AMD64 Solaris 10 system here:

    PTHREAD_CC = cc
    PTHREAD_CFLAGS = -D_REENTRANT 
    PTHREAD_LIBS = -lpthread

But then, things aren't as simple as they seem. From the cc(1) man page:

 -mt  Passes D_REENTRANT to preprocessor.  Appends  -lthread.
      If  you are doing your own multithread coding, you must
      use this option in the  compile  and  link  steps.   To
      obtain  faster  execution,  this option requires a mul-
      tiprocessor system. On a single-processor  system,  the
      resulting executable usually runs more slowly with this
      option.

So potentially, for the Solaris compiler, -D_REENTRANT is redundant and -mt is
also needed in PTHREAD_LIBS...

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