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

[Daniel Richard G.]

Follow-up Comment #5, patch #7666 (project autoconf-archive):

Sounds about right. From the (Solaris 8) CC(1) man page...

  -mt       Compile and link for multithreaded code.

            This option:

            o Passes -D_REENTRANT to the preprocessor

            o Passes -lthread in the correct order to ld

            o Ensures that, for standard mode (the default
              mode), libthread is linked before libCrun

            o Ensures that, for compability mode (-compat),
              libthread is linked before libC

            The -mt option is required if the application or
            libraries are multithreaded.

            Warnings:

            You must use this option, rather than -lthread.

            If you are using POSIX threads, you must link with
            the options -mt -lpthread.  The -mt option is
            necessary because libC (compatibility mode) and
            libCrun (standard mode) need libthread for a mul-
            tithreaded application.


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