[Varnish] #663: Varnish should auto-configure pthread support and VCC_CC

[Varnish]

#663: Varnish should auto-configure pthread support and VCC_CC
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 Reporter:  slink                                 |        Type:  enhancement
   Status:  new                                   |    Priority:  high       
Milestone:                                        |   Component:  build      
  Version:  trunk                                 |    Severity:  normal     
 Keywords:  errno, mt-safety, pthread, reentrant  |  
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 The issues described in
 [http://lists.varnish-cache.org/pipermail/varnish-
 misc/2010-February/003831.html this thread] on varnish-misc were found to
 be root-caused in missing compiler flags for an MT-safety.

 I'll attach a patch to amend configure.ac with the ax_pthread macro, which
 hopefully will do the job of determining the correct settings cross
 platform.

 I've tested this change with trunk (4606) on OpenSolaris snv_111 with both

  * gcc version 3.4.3 (csl-sol210-3_4-20050802)

  * cc: Sun Ceres C 5.10 SunOS_i386 2009/03/06

 and make check has not shown any reproducible issues. (I've seen random
 issues which were not reproducible and probably timing related, which I
 will have to investigate further).

 Also I have improved auto-configuration of VCC_CC.

 I am currently writing a test specific to errno MT-safety.

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Ticket URL: <http://varnish-cache.org/ticket/663>
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