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

[Daniel Richard G.]

Follow-up Comment #8, patch #7666 (project autoconf-archive):

My concern is the redundancy of specifying -D_REENTRANT with cc+"-mt" or
gcc+"-pthreads", as well as cc+"-lpthread", and the lack of "-mt" in
PTHREAD_LIBS.

There is this note in the macro:

  # On Solaris (at least, for some versions), libc contains stubbed
  # (non-functional) versions of the pthreads routines, so link-based
  # tests will erroneously succeed. [...] So,
  # we'll just look for -pthreads and -lpthread first:

Does anyone here know what versions of Solaris this applies to? Is this a
SunOS4 thing?

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