[MacPorts] #38766: Building atlas with clang 3.3 needs excessive memory

[MacPorts]

#38766: Building atlas with clang 3.3 needs excessive memory
------------------------+--------------------------------
 Reporter:  bgschaid@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.3
 Keywords:              |       Port:  atlas
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 Tried to do a routine upgrade of the installed software. Amongst others:
 {{{
 port outdated
 The following installed ports are outdated:
 atlas                          3.10.1_2 < 3.10.1_3
 }}}
 The installed atlas is
 {{{
 port installed atlas
 The following ports are currently installed:
   atlas @3.10.1_2+gcc45 (active)
 }}}
 The update started by fetching clang3.3 which made me suspicious because
 in the past I already had the experience that clang needs much more memory
 than gcc, but I figured "Hey. Surely the guy who packaged it knows what
 he's doing". Compilation of atlas took several hours. When I left the
 computer and returned an hour later it turned out that the disk which
 previously had 20Gig free had filled because of bloated swap-files.
 Computer was thus unusable. Only thing I could see from a htop I had
 running was some program of user macports with 14Gig Virtual and 4.5Gig
 residual memory

 As gcc45 is no longer an option for atlas I did a "port upgrade atlas
 +gcc46" and the compilation finished after a quarter of an hour. Maybe
 that has to do with
 {{
 {Warning: GCC compilers on MacOS do not support AVX: downgrading.
 }}}

 Anyway: would be nice if the default settings for the port would be such
 that it compiles without problems on machines with moderate memory
 installation (mine has 8Gig. The maximum that fits into that model). Those
 who need the extra speed that CLang might provide can always choose that
 variant I think

-- 
Ticket URL: <https://trac.macports.org/ticket/38766>
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